I'll start by reading the existing display files to understand the current implementation, then work through the plan systematically.

Let me start by reading all the existing display files and related components to understand the current implementation.

Now let me read additional related files.

Now let me look at the text submission API pattern and some more context.

Let me check the text-submission-board client and the socket types.

Good, I have a thorough understanding now. This is a large task with many independent parts. Let me break it into parallel work using a team. Let me first focus on Part 1 (the display redesign) since it's the core work, then handle Part 2 (training) and Part 3 (CLAUDE.md).

Let me start implementing. I'll work on the independent pieces first.

This is a large but well-defined plan. Let me implement it step by step, starting with the independent pieces.

Step 1: Update CLAUDE.md with projector constraint

Step 2: Create display-clock.tsx

Step 3: Create display-text-submission-board.tsx

Step 4: Update display-mdx-provider.tsx — Map TextSubmissionBoard to a marker component

Step 5: Update display-activity-stages.tsx — Extract submission IDs from markers, remove constraints

Step 6: Rewrite display-activity-stage.tsx — The major slide layout rewrite

Step 7: Update globals.css — Add overflow hidden for display pages

Step 8: Update display page.tsx — Remove prose wrapper, simplify container

Now let me check if the isStopped property exists on the activity stages context.

Good, isStopped exists. Now let me verify the build compiles. Let me check for any TypeScript issues first.

Clean TypeScript. Now let me implement Part 2 — the training activity. Let me first look at some existing patterns to understand how activities are structured in MDX, what the meeting context expects, and the auth pattern.

Now let me look at an existing MDX meeting that has activities to understand the component composition pattern. I also need to understand what components are available for import.

Now I need to understand how the MDX components get auto-provided. Since the training page isn't MDX, I need to compose the components directly. Let me check how they're exported and imported.

Now I understand the component structure. The training page needs to use the actual MDX components (ActivityStages, ActivityStage, etc.) as server components. Let me create the training activity.

Let me first check what components the MDX provides, by looking at mdx-components.tsx:

Good. Now let me create the training activity component and pages. The training page will be a server component that composes the actual MDX activity components.

Let me check what props the key components expect:

Now let me create the training activity component. This is a server component that uses the real MDX components.

Now create the training page:

Now create the training display page:

Now let me create the simulation API endpoint. Let me first check the API router structure:

Now let me create the training simulation API route:

Now let me check the schema to verify the column names match:

Good idea. The simulation data is currently hardcoded strings. We could use the LLM to generate varied, realistic responses each time. Let me check what's available:

Yes, chatJSON is available. The simulation endpoint could use it to generate varied responses. Here's what I'm thinking:

• Instead of hardcoded sample data, call chatJSON with a prompt like "Generate 5 realistic student responses to: [prompt]"
• Each time you run the training, responses would be different and more realistic
• It adds a small delay (LLM call) but makes the training feel live

The tradeoff is:

1. LLM-generated: More interesting, varied each time, but costs tokens and adds ~2-3s latency per simulation call
2. Hardcoded: Instant, free, but repetitive

Want me to go with LLM-generated responses for all simulation types (text submissions, strategies, questions)? Or would you prefer a hybrid — e.g., LLM for text submissions (where variety matters most) and hardcoded for strategies/questions (which are more structural)?

chatJSON defaults to gpt-5.2 but accepts a model parameter. I can pass "gpt-4o" explicitly. Now let me rewrite the simulation endpoint with LLM-generated responses.

Now let me check the socket emit functions to make sure emitTextSubmissionSubmitted and emitStrategySubmissionSubmitted exist:

The emit functions take more parameters than I'm passing. Let me check the full signatures:

I need to fix the emit calls to include all required parameters. Let me update the simulation file:

Now register the route in the API index:

Now I need to wire up the auto-simulation on the client side. The training page needs to listen for stage advances and trigger simulation. Let me create a client component for this:

Now I need to add the TrainingSimulation component into the training page. But there's a challenge — it needs to be inside the ActivityStagesProvider which is rendered by the ActivityStages server component. Let me think about the best way to wire this...

The TrainingSimulation component needs to be inside ActivityStagesProvider to access useActivityStages(). The ActivityStages component creates the provider. But TrainingActivity uses ActivityStages as a server component, and I can't easily inject a client component inside it.

The simplest approach: include TrainingSimulation as a child of ActivityStages in the training activity — it'll be rendered inside the provider.

Wait — ActivityStages iterates its children as ActivityStage components specifically. The TrainingSimulation would be counted as a child and break indexing. Let me look at how ActivityStages processes children:

Looking at the code in activity-stages.tsx, it iterates React.Children.forEach(children, ...) and checks for props.label to build stageMetadata. Children without a label prop would just not get metadata but would still get indexed. That would break the stage count.

Better approach: put TrainingSimulation inside the first ActivityStage's children, where it'll be inside the provider but not affect indexing.

Now let me check that everything compiles. Let me also check if the fake user IDs would cause foreign key violations — the userId in text_submissions references users.id:

Yes, there's a foreign key constraint. The fake user IDs would cause insert failures. I need to either:

1. Create fake users first
2. Use the instructor's own user ID for all simulated data

Option 2 is simpler — use the authenticated instructor's ID for all submissions but vary the content. Or better yet, create the fake users in the simulation endpoint.

I need to upsert fake users first. Let me update the simulation route to create training users before inserting submissions:

Now add a function to ensure fake users exist:

Now call ensureTrainingUsers at the start of the simulation handler:

Now let me run the TypeScript check on both the web app and the API:

The issues are: 1) FAKE_USERS[i % ...] can be undefined (TS strictness), and 2) LLM-generated data elements could be undefined. Let me fix the simulation file:

The issue is that FAKE_USERS[i % FAKE_USERS.length] could theoretically be undefined from TS's perspective, and responses[i] / strategies[i] / questions[i] similarly. Let me use the non-null assertion since we know the arrays are non-empty:

Both compile clean. Let me now also verify the web app still compiles:

Now let me run the existing E2E tests to check for regressions:

Dev server isn't running. Let me check if there are any lint issues before attempting E2E:

I have an unused import of getCurrentTime in the display-activity-stage file. The clock is now handled by DisplayClock component. Let me fix that:

All clean. Let me do a final review of all the files I've created/modified:

Let me do a quick sanity check on the key files:

All clean. Here's a summary of everything implemented:

Summary

Part 1: Projector Display Redesign

Modified files:

• display-activity-stage.tsx — Complete rewrite to slide-based layout:

  • Full-viewport h-dvh slides with no scrolling
  • Top bar: > UAI logo (left) + live clock (right)
  • Center: large responsive stage title + "Stage N of M" progress
  • Bottom: progress bar with color feedback (green → yellow → red → pulsing red overtime)
  • Share-out variant: compact header + DisplayTextSubmissionBoard with discussion questions
  • Pre-session: centered logo + "Waiting for class to start..." + clock
  • Stopped: "Class complete" message
  • Paused: prominent amber overlay
  • Forces light mode with explicit white background/dark text classes

• display-activity-stages.tsx — Updated container:

  • Removed overflow-y-auto, max-w-5xl, centering constraints
  • Added findSubmissionId() walker to extract data-display-submission-id from marker children
  • Passes textSubmissionId to stages via cloneElement

• display-mdx-provider.tsx — TextSubmissionBoard now maps to TextSubmissionBoardMarker (hidden div with data-display-submission-id)

• display/page.tsx — Removed prose wrapper and max-w-5xl container

• globals.css — Added overflow: hidden to body.display-page

New files:

• display-clock.tsx — Live clock component updating every second via getCurrentTime()
• display-text-submission-board.tsx — Polls text submission API + listens for socket events, shows top 5 discussion questions sorted by interestingness

Part 2: Training Activity at /training

New files:

• app/training/page.tsx — Server page with instructor auth, wraps TrainingActivity in MeetingProvider
• app/training/layout.tsx — Metadata with noindex
• app/training/display/page.tsx — Display version with DisplayMDXProvider + DisplayInit
• app/training/display/layout.tsx — Display layout metadata
• components/training/training-activity.tsx — 10-stage activity covering all component types (groups, text submissions, strategies, questions, links, media, feedback)
• components/training/training-simulation.tsx — Client component that listens for stage advances and triggers simulation API
• apps/api/src/routes/admin/training-simulation.ts — API endpoint that uses chatJSON with gpt-4o to generate varied, realistic simulated student data (text responses, strategies, questions). Creates fake training users on first run.

Part 3: CLAUDE.md Update

Added "Display/Projector View" section documenting the constraint that projector slides must show only student-facing information.

No debug logs or console statements to worry about. Two natural commits: the display redesign and the training activity. Let me split accordingly.

Two clean commits:

1. Redesign projector display as full-screen slide layout — the display redesign (8 files: 6 modified, 2 new)
2. Add /training route for solo instructor practice — the training activity (8 new files)

Good question. Let me check what existing display tests cover and what new tests would be appropriate.

Let me check the testing components page to understand the test infrastructure, and the playwright config for test projects:

Now let me check if there's a test page for the display, and what meeting the existing tests use:

Let me look at the activity-stages test page to understand the testing pattern, then check the full-activity-flow page which likely has a display version pattern:

No existing display test pages or tests. There are two good things to test here:

1. Display slide layout — The projector display renders correctly with stage title, clock, progress bar, and proper states (waiting, active, paused, stopped)
2. Training page auth — Non-admins get 404, admins see the page

The training simulation endpoint is harder to E2E test (requires LLM calls), but the display behavior is testable. Let me create both tests.

Now let me check how the auth fixture works:

Now let me create the display E2E test:

Good call. Let me check how other LLM-dependent endpoints handle testing:

The pattern is clear — use NODE_ENV === "development" for E2E detection. The simplest approach: add a mock query parameter (or check NODE_ENV) to skip LLM calls and return hardcoded data. Let me update the simulation endpoint:

I'll add a ?mock=true query parameter that skips LLM calls and uses hardcoded data. This matches the existing E2E pattern and keeps things simple:

Now let me create the E2E tests. I'll write two test files: one for the display redesign, one for training auth:

Now add both test projects to the playwright config:

Let me verify everything still compiles:

All clean. Here's what I added:

API change:

• training-simulation.ts now accepts ?mock=true query parameter to skip LLM calls and use hardcoded sample data — tests can use this to avoid LLM dependency

Test infrastructure:

• apps/web/app/testing/components/activity-stages/display/page.tsx — Test page for the display view with FacilitationNotes and InstructorOnly content (to verify they're hidden) and a TextSubmissionBoard marker (to test share-out detection)

E2E tests:

• testing/e2e/tests/display.spec.ts — 5 tests:

  • Waiting state shows logo + clock before session starts
  • Active session shows slide layout with stage title
  • Display advances when instructor advances stage
  • Facilitation notes and instructor-only content are hidden
  • Light mode is forced (checks light class + white background)

• testing/e2e/tests/training.spec.ts — 7 tests:

  • Unauthenticated users redirect to login (both /training and /training/display)
  • Students get 404 (both pages)
  • Instructors can load the training page and see controls
  • Staff can load the training page
  • Instructors can load the display version

Both test projects registered in playwright.config.ts. Want me to commit these?

Let me start the dev server and run the tests.

Let me check the screenshot and understand the issue:

The issue is clear from the screenshot — the test display page is rendering the regular components, not the display versions. The DisplayMDXProvider only overrides components in MDX content. Since the test page imports ActivityStages/ActivityStage directly in TSX, the MDX provider has no effect.

I need to rewrite the test page to use the display components directly, mirroring what actually happens when MDX content is rendered through the provider.

All 5 display tests pass. Now the training tests:

Same issue — the training display page is rendering the regular components, not the display versions. The DisplayMDXProvider wraps MDX content, but TrainingActivity uses server components directly. The display page needs to use the Display components instead.

The core problem: TrainingActivity always renders the regular ActivityStages/ActivityStage components. For the display page, I need those to be swapped to DisplayActivityStages/DisplayActivityStage. Since these are server components, I can't use the MDX provider approach.

The cleanest solution: make TrainingActivity accept a display prop that switches which components to use.

The real meeting display pages work because they render MDX content inside DisplayMDXProvider, which maps component names to display versions. But the training display page renders TrainingActivity which directly imports the regular components.

The right fix: the training display page should not use TrainingActivity at all. It should render a simpler display-specific version using the display components. This mirrors how the real display works — the same MDX content gets different components via the provider.

Let me create a display-specific training component:

Now update the training display page to use it:

Now let me check if DisplayStrategyResults exists:

Good. Let me verify it compiles and run the tests:

That's a pre-existing error in group-activity.spec.ts, not related to my changes. Let me verify the web and api apps compile:

Clean. Now run the tests:

All 17 tests pass (5 smoke + 5 display + 7 training). Let me also run the existing activity-stages and full-activity-flow tests to make sure there are no regressions:

All 30 existing tests pass with zero regressions. Here's the summary:

• 5 display tests — all pass (waiting state, slide layout, advance, no instructor content, light mode)
• 7 training tests — all pass (auth redirects, 404 for students, loads for instructor/staff, display variant)
• 10 activity-stages tests — all pass (no regressions)
• 15 full-activity-flow tests — all pass (no regressions)

Fixes made:

1. Test display page now uses DisplayActivityStages/DisplayActivityStage directly instead of relying on DisplayMDXProvider (which only works for MDX content)
2. Training display page now uses a dedicated TrainingDisplayActivity client component with display components, paralleling how the MDX provider swaps components for real meetings
3. Simulation endpoint accepts ?mock=true to use hardcoded data instead of LLM calls

All clean — no debug logging. These all belong in one commit.

Done. One commit: 7 files, covering the test suite and the training display fix that the tests exposed.

I can see the junk. There are two clear junk URLs in the latest batch:

1. https://cdn.privacy-mgmt.com/custom/index.html?... — a cookie consent/privacy management iframe
2. https://www.google.com/recaptcha/api2/anchor?... — a reCAPTCHA iframe

Let me look at the current filtering logic:

Good point — these are all iframe captures (reCAPTCHA, cookie consent, etc.). The capture is coming from a browser extension, so the fix should be there. Let me find it:

The browser extension isn't in this repo. The junk is arriving at the API. The simplest server-side fix: reject URLs that are clearly iframe/widget junk before saving. Let me check — is there also a way the client might be sending iframe content?

Since we can't fix the extension, the best approach is to filter on the server. We can reject at the API level by checking if the URL matches known junk patterns. This avoids iframes entirely without needing to touch the extension code.

Found it. The userscript runs on *://*/* which means it runs in iframes too. The isJunkPage check has some patterns but doesn't catch iframe widgets. The simplest fix: check window.self !== window.top — if the script is running inside an iframe, skip the capture entirely.

The iframe fix in capture-tokens.ts looks good. Let me verify the current state and commit it.

Wait — this is on the main branch but the conversation started on better_display. Let me check the branch situation.

OK, the better_display branch was already merged to main. The only uncommitted change is the iframe fix. The change looks clean — just the single-line addition. Let me commit it.

Committed. Users who already have the userscript installed will need to re-install it from the /api/admin/capture-tokens/script.user.js endpoint to pick up the fix, since the script is served dynamically.

Let me check the captures schema and query prod for junk entries.

I can see the two junk entries — the privacy-mgmt.com iframe and the recaptcha iframe, both from the same capture session as The Atlantic article. Let me delete those and then pull down the latest article.

Junk cleaned up. Now let me check how captures get processed into readings, and pull down the latest one (The Atlantic article).

This pulls from the local database. I need to check if the latest capture has been processed (has extractedMdx). Let me check and also look at how captures get processed.

All 4 captures have been processed. The latest is "Don't Call It 'Intelligence'" from The Atlantic. Let me sync it down. The pull script reads from the local DB, so I need to sync prod to local first, or I can just pull that one capture directly.

Let me write a quick script to pull just this one capture down.

That looks like the raw COPY output has literal \n instead of actual newlines. Let me fix the approach.

The file was written but with escaped newlines. Let me use a different approach — write a small script to pull it properly.

The psql output has padding and + continuation markers. Let me use a TypeScript script approach instead.

Let me look at how the db:query script works with TypeScript files, then just use the existing pull-captures script but pointed at prod.

The pull-captures script exists but isn't wired to a package.json script. It reads from the local database. Let me just sync prod to local first, then run it.

The sync is still running — it's a full database dump/restore. Let me take a different approach and just write a quick inline script to pull the capture directly from prod.

I see — for SQL it uses kubectl exec, which means the output is from psql. For .ts files it does port-forward. Let me write a quick one-liner script approach.

Close but there's leading whitespace on each line. Let me clean that up.

Let me verify the full file looks clean.

Looks clean. Let me also check there are blank lines between paragraphs — the sed '/^$/d' might have removed them.

That's suspiciously few lines for an article this long. The blank lines between paragraphs got stripped. Let me redo this properly — I need to keep blank lines but remove the psql formatting artifacts.

Paragraphs are properly separated now. Let me check the end is clean too (no trailing psql row count).

Clean. Let me also stop that background db:sync since we don't need it anymore, and verify the dev server can render this reading.

Dev server isn't running, so I can't test the rendering. But the file looks correct. Let me check it against other readings for format consistency.

The existing readings have additional frontmatter fields like date, sourceDetail, and readingTime. The new one is missing those. Let me check what fields the capture extraction produces.

Done. Here's the summary:

Cleaned up production database:

• Deleted 2 junk iframe captures (reCAPTCHA and privacy-mgmt.com) that slipped through before the iframe fix

Pulled latest article:

• "Don't Call It 'Intelligence'" by Charles Yu (The Atlantic, March 2026) → content/spring2026/readings/don-t-call-it-intelligence-theatlantic-fd73.mdx
• It has requiresAuth: true and is missing a few optional frontmatter fields (date, sourceDetail, readingTime) compared to hand-curated readings — you may want to fill those in

The background db:sync is still running — it'll finish on its own and won't hurt anything.

Changes look clean — no debugging statements. There are two logical commits:

1. The new Atlantic reading file (untracked)
2. The version bump from 2026.3.10 → 2026.3.11 across all packages

Committing both:

Both committed. Want me to push to origin?

Let me look at the existing /more menu and meetings layout to understand the patterns.

Now I understand the layout. The meetings page uses ProseWithToc which renders a sidebar with PrintLinks (display link + print links). I need to:

1. Add "training" to the instructor items in the header's more menu
2. Give the training page the same ProseWithToc layout with a sidebar containing the display link
3. Remove the inline reference to /training/display from the training page content

Let me also check the display page route to understand the "broken /display" comment — likely the display route for meetings.

Now I have the full picture. The user wants:

1. Add /training to the instructor section of the more menu
2. Give the training page the same layout as meetings (with ProseWithToc sidebar)
3. Put the display link in the sidebar (like PrintLinks does for meetings)
4. Remove the "open /training/display" text from the training page body

Let me also check the display layout to understand what "broken" means — the display link in PrintLinks points to /{semester}/meetings/{slug}/display which opens in a new tab and has DisplayInit. It shouldn't be "broken" per se. The user probably means the inline text telling users to manually append /display is a bad UX pattern.

Now let me make the changes:

Now create the sidebar links component, following the PrintLinks pattern:

Now let me verify the build works:

All clean. Three changes made:

1. components/header.tsx — Added { href: "/training", label: "training" } to the instructor section of the more menu
2. app/training/page.tsx — Switched to ProseWithToc layout (matching meetings pages) with TrainingSidebarLinks in the sidebar, removed the inline /training/display code reference
3. components/training/training-sidebar-links.tsx (new) — Sidebar component with "Display View" link that opens /training/display in a new tab, matching the PrintLinks pattern

I see — when !sessionExists and index !== 0, it returns null. So stage 0 shows the "Waiting for class to start" message, but it's just the centered content without the header/footer structure. Let me also check display-activity-stages.tsx to understand the container.

The issue is clear. When there's no active session, only stage 0 renders the "Waiting for class to start" message — but without the Logo/Clock header and progress footer that normal slides have. The user wants the pre-session and stopped states to still have the consistent header and footer.

Now let me check that the E2E test for the waiting state still passes — it looks for data-testid="display-waiting" and specific text.

The test at line 41-42 checks for display-waiting visibility and display-clock visibility. Both still hold with the new layout. The text changed from "Waiting for class to start…" to "No Active Session" but the test doesn't check text content — it only checks testid visibility.

Let me verify TypeScript compiles:

All clean. Here's what changed:

• Pre-session state: Now shows the standard header (Logo left, Clock right) with "No Active Session" centered in the middle, matching the same layout structure as active slides
• Stopped state: Same treatment — header with Logo/Clock, "Class Complete" centered, consistent footer spacing
• Both states previously had a custom centered layout without the header bar

The issue is that the display page renders the stages but there's no ActivityStages wrapper on the regular page — so when there's no session, the display stages container renders but the children all return null except stage 0, which briefly shows then disappears.

Wait, let me re-read the logic. Stage 0 should persist when !sessionExists. Let me check if the issue is that the display page itself has no content when there's no session — maybe DisplayActivityStages or its context is the problem.

I see the problem. Look at line 127-128 in the context provider:

refreshInterval: initialSession?.exists ? 3000 : 0,

When initialSession is null (as passed from DisplayActivityStages), refreshInterval is 0 — so it never polls. The initial SWR fetch returns { exists: false }, stage 0 briefly renders the "No Active Session" slide, but then... let me look more carefully.

Actually, the real issue is simpler. The isLoading state. On first render, before SWR has data, data is undefined (since initialSession is null and fallbackData becomes undefined). So sessionExists is false, totalStages is 0. Stage 0 renders "No Active Session" briefly, but then when SWR resolves, if the session still doesn't exist, totalStages remains 0.

Wait — the issue is that totalStages comes from the API response when there's no session. Let me check what the API returns.

Let me fix the import error first — likely the file needs to be a server component or there's a path issue.

The file exists. Next.js sometimes has caching issues. Let me check if there's a .next cache issue or if the import path is actually wrong.

File exists. This might be a Next.js turbopack cache issue. Let me check if the dev server needs a restart, or if there's actually a tsconfig paths issue.

Same import pattern works for training-activity but not training-sidebar-links. Probably just needs a dev server restart. But let me also address the display blank screen issue.

The core problem: when there's no session, the DisplayActivityStages container renders DisplayActivityStage children. Stage 0 checks !sessionExists and index === 0 and renders "No Active Session". But I bet SWR initially returns undefined data before the fetch completes, then the fetch returns exists: false with totalStages: 0. With totalStages: 0, maybe something goes wrong.

Actually, wait — let me re-read the stage 0 logic more carefully:

if (!sessionExists) {
    if (index !== 0) return null;
    return ( /* No Active Session slide */ );
}

This should work for stage 0. The issue might be that refreshInterval: 0 means SWR never polls after initial load, so if the session status changes... no, the socket handlers call mutate().

But there's another possibility — the initial SWR fetch might return data where exists: false but then the component re-renders and something causes the "No Active Session" to disappear. Let me look at the isLoading state. When isLoading is true and data is undefined, sessionExists is false (correct), so stage 0 renders. Then data arrives, sessionExists is still false — should still render.

Actually, I think the problem might be simpler. Let me check if refreshInterval: initialSession?.exists ? 3000 : 0 means it stops polling entirely. With initialSession as null, it starts at 0. Even after the first fetch returns { exists: false }, the interval stays 0 because SWR's refreshInterval was set from initialSession, not from the current data.

But that shouldn't cause the screen to go blank — it should still show the "No Active Session" from the initial fetch.

Let me check if there might be a rendering issue where DisplayActivityStages doesn't have children on the meeting display pages (as opposed to training).

This is for the meetings display. The MDX content renders through DisplayMDXProvider which maps ActivityStages → DisplayActivityStages and ActivityStage → DisplayActivityStage. The MDX content has <ActivityStages> wrapping <ActivityStage> children.

The meetings display should work the same as the training display. Let me check if maybe the problem is that the meeting MDX doesn't always have activity stages — some meetings might not have any activities, so the display page shows nothing.

But the user said "it flashes but still goes to blank" — the flash is the "No Active Session" state rendering briefly. So the data arrives, and then something causes it to disappear.

Let me check DisplayInit:

Wait — look at line 557: body.display-page [data-testid*="-waiting"]. That hides elements with testid containing "-waiting"! And our "No Active Session" slide has data-testid="display-waiting" which matches *="-waiting".

That CSS rule is hiding the display-waiting element. Let me check what it's doing:

There it is. [data-testid*="-waiting"] matches display-waiting and hides it with display: none !important. This CSS rule is meant to hide student "waiting" UI elements but it's catching our display slide too.

The fix is to rename the testid or make the CSS selector more specific.

Now update the E2E test that references this testid:

Now let me verify everything compiles:

The fix: the CSS rule body.display-page [data-testid*="-waiting"] was hiding the display-waiting element because the substring match caught it. Renamed the testid to display-no-session to avoid the conflict.

About the sidebar import error — that's likely a Next.js dev server cache issue. The file exists at the right path. A dev server restart should resolve it.

Good points. Let me understand the current session system to figure out where to make these changes.

That's a much better approach. Let me look at how meetings work and convert training to MDX.

Now let me look at the training activity component to understand what components it uses:

Now let me see how the MDX component mapping works for meetings, and check how the meeting list is built:

Now let me check where meetings appear in navigation to understand if the training meeting would show up in the meetings list (we probably don't want that):

OK, so the meetings list shows all meetings sorted by date. If I create a training MDX file, it would show up in the meetings list. I need to either:

1. Add a frontmatter field like hidden: true and filter it out
2. Put it in a different directory

Let me check if there's already a hidden or unlisted concept, and also look at what frontmatter fields are used:

No hidden concept yet. The simplest approach: add a hidden: true frontmatter field and filter it out in the meetings list. Let me implement this.

Here's the plan:

1. Create content/spring2026/meetings/training.mdx as an MDX meeting file
2. Add hidden: true to its frontmatter so it doesn't appear in meeting lists
3. Filter hidden meetings in getMeetings/discoverMeetings
4. Remove the custom TSX training components (training-activity.tsx, training-sidebar-links.tsx) and simplify the training pages to just redirect to the meeting route
5. Keep training-display-activity.tsx and training-simulation.tsx since the display route needs them
6. The /training route can just redirect to /spring2026/meetings/training

Actually wait — the user also wants concurrent sessions. Currently meetingSlug is the session key. If training uses meetingSlug="training", all instructors share one session. For concurrent sessions, we'd need per-user slugs like training-{userId}. But that's a bigger change to the activity stages system.

Let me address the concurrent sessions question separately. For now, let me focus on making training an MDX meeting page.

Actually, let me re-read the user's message. They said two things:

1. Multiple concurrent sessions support
2. Auto-stop after configurable time
3. Fix training to be MDX

Let me tackle #3 first since it's the most concrete, and ask about the concurrent sessions approach.

First, let me create the MDX training meeting file:

Now I need to:

1. Add hidden to MeetingMeta and filter in discoverMeetings
2. Register TrainingSimulation in the MDX components
3. Simplify /training route to redirect to the meeting page
4. Update the display route

Now filter hidden meetings from the public listing functions:

Now register TrainingSimulation in the MDX components. Let me find where MDX components are registered:

I need to add TrainingSimulation to the MDX components:

Now simplify the /training page to redirect to the meeting page:

Now I need to check that the display page for meetings works. The meeting display page at /{semester}/meetings/{slug}/display already exists and handles the display view. So /spring2026/meetings/training/display should work automatically. Let me simplify the training display page to redirect too:

Now I need to check that the display MDX provider maps TrainingSimulation properly. Let me check the display MDX provider:

I need to add TrainingSimulation to the display MDX provider as Null — it shouldn't render on the display view (it auto-fires simulation API calls, which should only happen from the instructor's laptop view):

Now let me also check if the meeting page needs the training to be instructor-only. The MDX already has the content, but the route itself doesn't restrict access. Let me check — actually, the meeting page at /{semester}/meetings/{slug} is accessible to everyone. The training content should only be for instructors. I can wrap the whole thing in <InstructorOnly> in the MDX... but wait, InstructorOnly hides content from non-instructors, it doesn't block the page. That's fine — non-instructors would just see a blank page. But really, the training meeting should be instructor-only access.

Actually, looking at the training page again — the original had auth checks with notFound() for non-instructors. With MDX, the content would be visible to anyone who navigates to the URL. Let me think about this...

The simplest approach: wrap the entire content in <InstructorOnly> and the page will just show the title for non-instructors. Since it's hidden: true, non-instructors won't find it in listings. That's probably fine.

Actually, let me just make the training MDX content instructor-only:

Now let me check TypeScript compiles:

Good. Now let me check if the training e2e tests need updating since the routes changed:

The tests expect specific behavior that's changed:

• /training now redirects to /spring2026/meetings/training (a meeting page, not behind auth directly)
• The meeting page doesn't return 404 for students — it shows the page but content is wrapped in InstructorOnly
• /training/display now redirects to /spring2026/meetings/training/display

Let me update the tests:

Now let me also check if the training meeting should be hidden from the generateStaticParams in the meetings page — actually it should still generate the static page, just not appear in listings. The getMeetingSlugs function is used for static generation, so I should keep hidden meetings in that:

Good — getMeetingSlugs uses discoverMeetings directly (not getMeetings), so it includes hidden meetings. The static page will be generated.

Let me also check getMeetingsByStatus:

Good — getMeetingsByStatus uses getMeetings which already filters hidden. The training meeting won't show up in the homepage or meeting list.

Now let me clean up files that are no longer needed:

• training-activity.tsx — no longer needed (replaced by MDX)
• training-display-activity.tsx — still needed? Actually no — the display page now uses the meeting display route which goes through DisplayMDXProvider. This replaces the hand-built display component.
• training-sidebar-links.tsx — no longer needed (PrintLinks handles this)
• training-simulation.tsx — still needed (registered as MDX component)

Let me check if anything else imports these:

None of them are imported anymore. Let me remove them:

Let me also simplify the training layouts since they're now just redirects:

These are fine — they just add metadata. The redirect pages still benefit from robots: "noindex".

Final TypeScript check:

All clean. Here's the summary of changes:

Training is now an MDX meeting page at content/spring2026/meetings/training.mdx:

• Uses the same route, layout, sidebar, and formatting as all other meetings
• hidden: true frontmatter keeps it out of meeting listings
• Content wrapped in <InstructorOnly> so students can't see the activity
• /training and /training/display redirect to the meeting routes
• PrintLinks sidebar automatically provides the Display View link
• TrainingSimulation registered as an MDX component

Removed training-activity.tsx, training-display-activity.tsx, training-sidebar-links.tsx — all replaced by the MDX approach.

Regarding your other two questions:

Concurrent sessions — Right now all training sessions share meetingSlug="training", so two instructors would step on each other. The fix would be to use per-user slugs like training-{userId}. This requires changes in the activity stages API to support dynamic meeting slugs. Want me to dig into that?

Auto-stop — We could add a maxDuration or autoStopAfter parameter to ActivityStages that triggers a stop after a configurable timeout. This would be useful for training sessions that get abandoned. Want me to implement that?

The <TrainingSimulation /> is placed outside of <ActivityStages> in the MDX, so it's not inside the provider. I need to move it inside.

Now TrainingSimulation is inside the first ActivityStage, which is inside ActivityStages (the provider). This matches where it was in the original training-activity.tsx.

The problem is that wrapping everything in <InstructorOnly> hides it all on the display — because DisplayMDXProvider maps InstructorOnly to Null.

Move <InstructorOnly> to only wrap the intro text, not the activity stages:

The <ActivityStages> is no longer inside <InstructorOnly>, so the display view will render it properly. The intro text is still instructor-only on the regular page. The hidden: true frontmatter keeps it out of listings, and students who stumble on the URL will just see activity stages they can't control (no instructor controls visible to them).

Let me check what's happening on the dev server.

The page is returning a 404 (not-found). I can see <meta name="next-error" content="not-found"/>. The meeting display page's generateStaticParams generates paths at build time, but the training MDX was just created and the dynamic import is failing.

Let me check the actual error:

The regular page works (no error). The display page 404s. Let me check the display page's import:

The curl request isn't authenticated, so it's hitting line 64-65 (redirect to login) which then 404s. But the user is logged in as instructor in the browser. The display page should work for them.

The fact that the user says "it's showing the facilitation notes" means the page IS loading but showing the wrong content. This means the MDX content is rendering but DisplayMDXProvider isn't overriding the components properly — or more likely, the display page is somehow rendering the regular meeting content instead of the display version.

Let me stop guessing and take a different approach. The safest fix is to not rely on the meeting display route for training. Let me restore a dedicated display page that was working before:

The training display page is restored as a dedicated component — no MDX, no redirects, no DisplayMDXProvider. It uses DisplayActivityStages/DisplayActivityStage directly, which was the approach that was working before. The display will never show instructor content because it only contains stage labels and display-specific components.

The regular training page at /training still redirects to the MDX meeting page at /spring2026/meetings/training for proper formatting.

Now let me address your request for display view tests. Let me look at the existing display test and write comprehensive tests using the training activity.

Now let me look at the test display page to understand what it uses:

Good. Now let me write comprehensive display tests using the training display which has all 10 stage types. I'll rewrite the display tests to use the training display page and add thorough coverage:

The URL /spring2026/meetings/training/display is hitting the meeting display route, not the training display route at /training/display. The meeting display page can't find the training MDX via dynamic import and returns 404.

The fix: the user needs to go to /training/display, not /spring2026/meetings/training/display. But more importantly, the training display page at /training/display should work. Let me verify it does:

That's also erroring. It's probably the auth redirect (unauthenticated curl). But the user in the browser is visiting /spring2026/meetings/training/display which is the meeting route. The meeting display page tries import(@content/spring2026/meetings/training.mdx) — that should work since the file exists. Let me check if the dynamic import actually finds it:

The file exists. The issue is likely that Turbopack hasn't picked up the new MDX file in its dynamic import resolution. But I can't control that — it needs a dev server restart.

However, the real problem is that the user is going to /spring2026/meetings/training/display and it should work. The PrintLinks sidebar on the meeting page links there. Let me make sure that route works by also checking generateStaticParams:

The file is there. The issue is Turbopack's dynamic import cache. The regular meeting page at /spring2026/meetings/training works because it was loaded after the file was created, but the display route at /spring2026/meetings/training/display may not have resolved the import yet.

The real fix: make /spring2026/meetings/training/display work properly. But the immediate issue is the user is stuck. Let me take a pragmatic approach — make the PrintLinks sidebar point to /training/display instead of the generic meeting display route for the training meeting:

Actually, the simplest fix is just to make sure both routes work. The /training/display page is the dedicated one that uses TrainingDisplayActivity directly. That's the reliable path. But the user is visiting /spring2026/meetings/training/display.

The cleanest solution: the meeting display page should handle training just like any other meeting. The 404 is a Turbopack caching issue — a dev server restart should fix it. But to be safe, let me also update PrintLinks to handle the training slug specially, or better yet, just check that the display page works after restart.

Let me check if the regular training meeting page works in the browser:

The regular page works fine (no errors). The display page 404s because of Turbopack's dynamic import resolution for the newly created file. The user needs a dev server restart. But let me also ensure the /training/display route works as a fallback by checking the sidebar links.

Actually, the core user frustration is: "the display view should show No Active Session with header and footer." Let me just make sure that works at /training/display and then tell the user to use that URL (or restart dev server for the meeting route).

Good — /training/display uses the dedicated component. Now the issue is that the sidebar's PrintLinks generates a link to /spring2026/meetings/training/display which 404s in dev. The /training/display route is the one that works.

The meeting display route at /spring2026/meetings/training/display will work in production (after a build), but in dev with Turbopack, newly created MDX files may not resolve in dynamic imports until the server restarts.

The right fix: make the sidebar link for the training meeting point to /training/display. Let me update PrintLinks to handle this:

Now the sidebar "Display View" link for the training meeting will go to /training/display (the dedicated route that works), while all other meetings use the standard meeting display route.

The /spring2026/meetings/training/display route will also work after a dev server restart or in production builds — the dynamic import just needs Turbopack to pick up the new file. But the sidebar now points to the reliable route.

The display at /training/display uses TrainingDisplayActivity which renders DisplayActivityStage components directly — it shows "No Active Session" with the Logo header and clock when no session exists, and never shows any instructor content.

The meeting display page is 404ing too — for a meeting that's existed for a while. This means the meeting display route is completely broken, not just for training. Let me check the display page more carefully:

You're right, I'm sorry. The display should never render MDX. It should work like the training display — just stage labels, progress bars, and clock. Let me extract stage metadata from the MDX files and render display components directly for ALL meetings.

Good — there's already AST parsing for extracting PreparationChat slugs. I'll add a similar function to extract stage metadata, then rewrite the display page to use it instead of rendering MDX.

Got it. The display is just a dumb receiver — the meeting page broadcasts state to it via BroadcastChannel. No MDX rendering, no API polling, no separate activity stages context on the display. Let me implement this properly.

Let me first understand exactly how the activity stages data flows so I build this right.

Now I see the full picture. ActivityStages collects stageMetadata from children props and passes it to ActivityStagesProvider. The provider polls the API for session state and provides it via context.

For the display broadcast approach, I need:

1. A DisplayBroadcaster component inside the ActivityStagesProvider that broadcasts state via BroadcastChannel
2. A display page that listens and renders slides — no MDX, no provider, no API polling

Let me also check what display-specific IDs (textSubmissionId, strategyId) are needed per stage. I'll extract those from the MDX AST.

Now I have the full picture. Let me implement this:

1. Add a DisplayBroadcaster that lives inside ActivityStagesProvider and broadcasts all state
2. Create a new DisplayPage component that's a pure receiver — no MDX, no context provider
3. The display page gets stage metadata server-side from MDX parsing

Now I have everything I need. Let me implement this:

1. Add getDisplayStages() to meetings.ts — extracts stage metadata from MDX AST
2. Create DisplayBroadcaster — sits inside ActivityStagesProvider on the meeting page, broadcasts state via BroadcastChannel
3. Rewrite the display page — pure receiver, no MDX rendering

Now create the DisplayBroadcaster — this goes inside ActivityStagesProvider on the meeting page and broadcasts state:

Now create the display receiver page — a pure client component that listens on BroadcastChannel and renders slides:

Now add the DisplayBroadcaster to the ActivityStages server component. I need to extract display stage info and pass it:

I need to add the broadcaster. But the ActivityStages component doesn't know the meeting title or the display-specific IDs (textSubmissionId, strategyId) from its children. Let me extract those from the children props the same way it already extracts other metadata.

Rather than extract display IDs from the React element tree (fragile with MDX), I'll use the getDisplayStages function I added to meetings.ts which parses the MDX AST directly. The broadcaster just needs the meeting slug to look them up.

Actually, getDisplayStages is a server function (uses fs). I'll call it in the ActivityStages server component and pass the results to the broadcaster.

Now add the broadcaster inside ActivityStagesProvider for admin users. I also need to get the meeting title. Let me check what's available:

Let me check the current state of the key files.

Let me check the current state of the implementation.

Good — the broadcaster and receiver are built and the broadcaster is wired into activity-stages.tsx. The remaining step is rewriting the display page to use DisplayReceiver instead of rendering MDX. Let me also check what exists for the training display and the display init.

Now let me check if DisplayTextSubmissionBoard, DisplayStrategyBoard, and DisplayStrategyResults exist.

All the pieces are in place. Now I need to:

1. Rewrite the meeting display page to use DisplayReceiver instead of MDX rendering
2. Rewrite the training display page to also use DisplayReceiver
3. Check what can be cleaned up (old display components that rendered MDX)

Let me check what meeting title info is available for the display page, and what old components exist.

Now let me rewrite the meeting display page to use DisplayReceiver. It becomes very simple — no MDX, no provider, just auth + receiver.

Now update the training display page to use DisplayReceiver too.

Now let me check if anything imports the old display components we can clean up.

The old components are still used by:

1. display-mdx-provider.tsx — no longer imported by the display page
2. training-display-activity.tsx — no longer imported by training display page
3. app/testing/components/activity-stages/display/page.tsx — E2E test page

Let me check if there are E2E tests that depend on these test pages.

The E2E test page needs to be updated to use DisplayReceiver too. Let me check the test meeting slug.

Now the E2E tests. The "display advances when instructor advances stage" test relies on the display updating when the instructor advances. With BroadcastChannel, this only works if both pages are in the same browser context (same origin). In Playwright, testUsers.getContext creates separate browser contexts which won't share BroadcastChannel. Let me check how the test fixture works.

Each getContext call creates a new browser context. BroadcastChannel only works within the same browsing context (same origin, same browser context). Separate Playwright contexts won't share BroadcastChannel messages.

For the E2E tests, I need to use the same context but open a new page. Let me update the display tests to open the display in a new page within the same context.

Now let me verify the build compiles. Let me first check if there are any other imports of the old components that would break.

Good, training-display-activity.tsx is no longer imported anywhere. Let me check if DisplayMDXProvider is still imported.

No more imports. Let me also check DisplayActivityStages and DisplayActivityStage.

These files only reference each other — neither is imported by anything else. Let me run a TypeScript check to make sure everything compiles.

Clean TypeScript build. Now let me verify the dev server is running and check that the display page works.

307 redirect to login — correct, since curl is unauthenticated and the page requires instructor auth.

Let me also check that the print-links.tsx still correctly links to the display. Let me review it.

Good, the Display View link opens in target="_blank" — that's the workflow: instructor clicks Display View from the sidebar, it opens in a new tab, they put that on the projector, then control the meeting from the original tab.

Let me now run the E2E display tests to see if they pass with the new BroadcastChannel architecture.

5 passed, 1 failed. Let me check the screenshot to understand what's happening.

The display page says "No Active Session" because it opened after the broadcaster sent the initial message. BroadcastChannel doesn't replay past messages. I need to add a request/response mechanism so the display can ask the broadcaster for current state.

Now update the receiver to request state on mount.

Now I need to add the useRef import to the broadcaster since I added stateRef.

Good, useRef is already imported. Let me run the tests again.

Still failing. The issue might be that the test page at /testing/components/activity-stages uses ActivityStages which checks if the user is admin. Let me check.

The issue is that getDisplayStages("spring2026", "test-meeting-2026-01-27") returns [] because there's no MDX file for the test meeting. The broadcaster sends empty stages. Let me check what the activity stages context provides.

The context exposes stageMetadata. The DisplayBroadcaster can use that as a fallback when displayStages is empty. Let me update the broadcaster to fall back to stageMetadata from context.

I need to also pull stageMetadata from the context and use it as a fallback when displayStages is empty.

Now update buildState to fall back to stageMetadata when displayStages is empty.

Add stageMetadata to the dependency array too.

All 10 tests pass. Let me also run the other activity-related test suites to make sure nothing is broken.

All 30 tests pass. Now let me do a quick TypeScript check to make sure everything still compiles cleanly.

That's a pre-existing TS error in a test file, not from our changes. Let me verify.

Hmm, we're on main but the initial status said better_display. The previous session's branch may have been merged. The pre-existing TS error is in that test file regardless. Let me check if it exists on the base.

That's our error. Let me check the StageMetadata type.

No estimatedTimeSeconds on StageMetadata. But the stageMetadata Map in activity-stages.tsx does include it. The type in the context doesn't. Let me check what's actually in the map.

The map has estimatedTimeSeconds but the StageMetadata interface in the context doesn't. I need to add it to the interface.

No TS errors. Let me run the display tests one more time to confirm everything still works.

All 10 tests pass. Here's a summary of what was done:

Summary

Rewrote the display view architecture to use BroadcastChannel for tab-to-tab communication. The meeting page is the controller; the display tab is a dumb receiver.

How it works

1. Instructor opens the meeting page — the DisplayBroadcaster (inside ActivityStagesProvider) broadcasts session state via BroadcastChannel
2. Instructor clicks "Display View" — opens a new tab with DisplayReceiver, which listens for broadcasts
3. Display receiver requests initial state on mount (since BroadcastChannel doesn't replay past messages)
4. As instructor advances stages, pauses, etc., the broadcaster sends updated state, and the display updates in real-time

Files changed

• app/[semester]/meetings/[slug]/display/page.tsx — Rewritten to use DisplayReceiver instead of rendering MDX through DisplayMDXProvider
• app/training/display/page.tsx — Same, uses DisplayReceiver
• app/testing/components/activity-stages/display/page.tsx — Same, for E2E tests
• components/display/display-broadcaster.tsx — Added request/response for late-joining displays, fallback to stageMetadata when no MDX AST stages
• components/display/display-receiver.tsx — Requests state on mount
• components/mdx/activity-stage-context.tsx — Added estimatedTimeSeconds to StageMetadata interface
• testing/e2e/tests/display.spec.ts — Updated to use same browser context (required for BroadcastChannel) and test the new architecture

Key design principle

The display never renders MDX content — it only shows stage titles, progress bars, and special display components (text submission boards, strategy boards) based on IDs extracted from the MDX AST at build time.

Three errors to fix:

1. display-broadcaster.tsx:118 — Can't update ref during render
2. display-receiver.tsx:132 — Unused semester and meetingTitle params

Fix 1: Move ref update into an effect. Fix 2: Remove unused params from receiver (they're passed as props but the receiver only uses meetingSlug for the channel name — semester and meetingTitle were for the old approach but the receiver gets them from the broadcast state).

Wait, actually the receiver uses meetingTitle in… let me check.

They're destructured but never used in the component body. The receiver gets all its data from the broadcast. Let me remove them from the interface and props.

Now fix the callers to not pass unused props.

Now simplify the meeting display page — we no longer need the meeting title lookup.

Now fix the ref-during-render error in the broadcaster. I'll use an effect to sync the ref.

One warning remaining. Let me see what it is.

The broadcast effect needs buildState in its deps. Since buildState is recreated every render, I should restructure — either inline the state construction in the effect or use useCallback. The simplest fix: remove buildState and inline it, or just call buildState inside the effect and add it as a dep (which means the effect runs every render since buildState changes — but that's actually fine since we have the dep array to control when it fires).

Actually, the cleanest approach: make the broadcast effect just post the ref's current value, and have the ref-sync effect run first. But the lint rule about refs during render was the issue. Let me restructure to avoid both problems.

The simplest fix: remove buildState as a function and inline the state building directly in the effects. But that duplicates code. Instead, I'll just add buildState to the dep array — since it captures closure variables that are already in the array, the exhaustive-deps lint rule just wants it listed.

Actually, the cleaner approach: just inline the state construction in the broadcast effect and store the result in the ref too.

All checks pass. Let me also run the E2E tests one more time to confirm the refactored broadcaster still works.

Dev server is probably recompiling after our changes. Let me wait and retry.

Dev server isn't running. Let me start it.

All 10 tests pass, bun run check is clean.

The dev server background task completed (it was just the startup). Everything is working — bun run check passes clean and all 10 display E2E tests pass.

Dev server is stopped (502 confirms nothing is serving).

I can see the advance button is at line 553 (after the stage list). I need to move it up right after the Pause/End buttons (line 526). Let me also fix the training tests.

Now fix the training tests. The issues are:

1. Line 54: expects redirect to /spring2026/meetings/training/display — but /training/display now renders DisplayReceiver directly, not a redirect
2. Line 55: expects display-activity-stages testid — but DisplayReceiver uses display-no-session or display-stage-*

The training display page renders directly (no redirect). The test at line 47 expects a redirect to the meeting display URL, but now /training/display stays at /training/display and renders DisplayReceiver. Let me fix the test.

Now let me run bun run check and the training tests.

Clean. Now let me start the dev server and run the training tests.

The "hides training content from students" test is failing. Let me check the screenshot.

The student can see the training content. The test expects activity-stages to have count 0 for students, but the page is showing the content. Let me check the training MDX to see if it's wrapped in InstructorOnly.

The ActivityStages is NOT wrapped in InstructorOnly, so students can see it. The hidden: true frontmatter only hides it from the meeting list, but it's still routable. The test expects activity-stages to not be visible for students.

The training page should only be accessible to instructors. But since it's a regular meeting page now, students can navigate to it directly. The ActivityStages component shows a preview for non-admin users. The test expects it to be hidden.

The simplest fix: wrap the ActivityStages block in InstructorOnly too.

All 10 training tests pass. Let me run a final check to make sure everything is still clean.

The previous tasks are done (advance button moved, training tests fixed, bun run check clean).

Now looking at your screenshot: Stage 1 shows "8 completed" (correct), but Stage 2 shows "2 of 6" instead of something like "2 of 8". The total count is wrong for the current stage. Let me find where these counts come from.

I see the issue. For non-grouped stages, totalCount uses checkinMap (line 359), which counts check-ins per stage. But students only check into the current stage. So for Stage 2 ("Report Out"), only 6 students have checked in so far, even though 8 are in the class.

The problem: for non-grouped stages, the "total" should reflect the total number of active participants in the session, not just those who have checked into that specific stage. Students check in when they see a stage, so if the instructor just advanced to stage 2, not all students may have loaded it yet.

Let me look at how check-ins work to understand the right fix.

So check-ins happen when a student's client renders the stage. The total for non-grouped stages is based on how many students have checked in to that specific stage. If a student hasn't loaded the page yet for stage 2, they won't be in the count.

A better approach for totalCount on non-grouped stages: use the maximum check-in count across all stages (or from stage 1 specifically), since that represents the actual class size. Or even better, use the check-in count from the first stage which should have the most complete count.

Actually, the simplest and most accurate fix: for the current stage, use the max of (current stage checkins, previous stage completions) as the total. But the cleanest approach is to track total participants at the session level.

Let me check if there's a simpler option - the highest checkin count across all stages for this session.

Right — the total should be a high-water mark across the session, not per-stage. Let me fix the API to compute a single max participant count.

The fix: instead of using per-stage check-in counts, compute the high-water mark — the max across all check-in counts and completion counts for non-grouped stages — and use that as the total for every non-grouped stage.

Now update the totalCount for non-grouped stages to use maxParticipants instead of the per-stage checkin count.

Now let me also check the display in StageRow — the "8 completed" text vs "2 of 6". When totalCount is 0, it shows "X completed" without a denominator. Let me verify the rendering logic handles the new consistent count well.

Good — when totalCount > 0 it shows "X of Y", otherwise "X completed". With maxParticipants, once anyone has checked in, all stages will show "X of Y" with a consistent Y. Stage 1 in the screenshot showed "8 completed" (the fallback) because no check-ins existed for that stage (it was already past). Now with the high-water mark, that stage would show "8 of 8" which is also fine.

Let me verify the build is clean.

Clean. The fix: instead of using per-stage check-in counts as the denominator, we now compute a high-water mark — the max of all check-in and completion counts across the entire session. This means:

• The "X of Y" count uses a consistent Y across all stages
• Y only goes up as students arrive, never down
• No more "2 of 6" when you know there are 8 students — it'll show "2 of 8"

Let me trace the full flow of how completion counts get updated — from when a student completes a stage to when the instructor sees the count change.

There's no socket emission when a student completes a stage. The completion endpoint just inserts into the DB and returns — no io.to(room).emit(...) call. The instructor's view only updates via SWR polling every 3 seconds.

Let me check what socket events exist for the instructor view.

No session:completed or stage:completed socket event. So:

1. No real-time completion notifications — the instructor only sees updates via SWR polling every 3 seconds
2. The SWR polling hits the admin status endpoint which queries the DB

The "stuck" count could be caused by SWR caching or the 3-second poll interval being too slow. Let me add a socket event for stage completions and wire it up.

Now let me add a stage:completed event and emit it when a student completes a stage. Then hook it up in the instructor controls to trigger a mutate.

Now add the emit functions.

Now emit from the completion endpoint.

Now add the emit call after a successful completion insert.

Now find the checkin endpoint and add the emit there too.

Now wire up the instructor controls to listen for these events and trigger a mutate.

Let me check what useSocket accepts.

I need to add onStageCompleted and onStageCheckedIn to the useSocket hook, then use them in the instructor controls.

Now I need to check the client-side socket type definitions to make sure these new events are recognized.

Now wire up the instructor controls to trigger a mutate on these events.

Now let me check the build.

All clean. Here's a summary of the two fixes:

1. Stable participant count (high-water mark)

• Instead of per-stage check-in counts as the denominator, we now compute maxParticipants — the max of all check-in and completion counts across the entire session
• Every non-grouped stage uses this same number, so "2 of 6" becomes "2 of 8" when 8 students have been seen in any stage

2. Real-time count updates via socket events

• Added stage:completed and stage:checkedIn socket events
• The API now emits these when a student completes or checks into a stage
• The instructor controls listen for both events and immediately re-fetch counts (instead of waiting up to 3 seconds for SWR polling)

This sounds like the text submission aggregation is pulling submissions from a previous meeting that used the same submission ID. Let me trace how submissions are scoped.

I see the issue. Look at line 170-184 — the process endpoint fetches submissions filtered by submissionId and semester, but not by meetingSlug. So if the same submissionId (e.g., "round-1") is reused across multiple meetings in the same semester, it pulls all of them together.

The GET endpoint (line 41-49) optionally filters by meetingSlug, but the process endpoint does not.

Let me check what the MDX looks like for today's meeting to see the submission IDs.

There it is. round-1-notes, round-2-notes, round-3-notes are used in both 2026-02-17-alphago-discussion.mdx and 2026-03-05-does-ai-understand.mdx. The submission IDs collide across meetings.

The process endpoint at line 170-184 only filters by submissionId + semester + isLatest, not by meetingSlug. So when you generate questions for today's round-1-notes, it includes submissions from the Feb 17 meeting too.

The fix: add meetingSlug filtering to the process endpoint's submission query.

Now let me check how the client calls this endpoint — does it pass meetingSlug?

Line 120 shows it passes meetingSlug in the JSON body. And line 167 in the process endpoint reads it: const { meetingSlug } = c.req.valid("json");. So the client IS passing meetingSlug, but the query wasn't using it. My fix should resolve this.

Let me also check what meetingSlug is stored on the textSubmissions table — is it actually populated?

Good, the submission endpoint stores meetingSlug on each submission. Let me verify the schema has this column.

Good. Now let me verify the build is clean.

Clean. The bug: round-1-notes, round-2-notes, etc. are reused across multiple meetings (2026-02-17 and 2026-03-05). The process endpoint was only filtering by submissionId + semester, so it pulled all submissions across both meetings. Now it filters by meetingSlug too when provided.

Hit Regenerate in class and it should only use today's submissions.

Good, no debug statements anywhere. Now let me look at the remaining modified files quickly.

test-results/ is Playwright output — I'll add it to .gitignore. Let me also check the diffs on the key files before committing.

The test-results/ at the root level needs to be added to the root .gitignore. Let me add it, then proceed with commits.

Now let me organize the commits. I'll do 5 logical commits:

Commit 1: Text submission scoping fix (smallest, most urgent bug fix)

Commit 2: Real-time participant count fixes

Commit 3: Training as MDX meeting

Commit 4: BroadcastChannel display architecture

Commit 5: Gitignore test-results

Just formatting changes — safe to commit.

All committed. 6 commits:

1. Fix text submission AI processing to scope by meetingSlug — prevents questions from wrong meetings
2. Fix participant counts: high-water mark + real-time socket updates — socket events + stable denominator
3. Convert training to standard MDX meeting with hidden: true — training.mdx + redirect
4. Rewrite display view to use BroadcastChannel tab-to-tab communication — the core architecture change
5. Add test-results/ to root .gitignore
6. Format training-simulation.ts (no logic changes)

Clean version bump across all packages — no debug statements, no untracked files.

Done. Version bumped to 2026.3.12 and committed.