I'll start by reading the key files I need to modify, then implement the changes.

Now let me read the E2E test files in parallel.

Now I have all the context I need. Let me create the tasks and start implementing.

Now let me check what version was installed and make sure it's exact.

Bun added it with ^ prefix. Need to pin it to an exact version.

Now create the alert-dialog.tsx component.

Now refactor activity-stage-instructor.tsx to replace confirm() calls with AlertDialog.

Now add the state variables for the confirm dialogs:

Now replace the handleReset function to remove the confirm() call:

Now replace the handleStop function to remove the confirm() call:

Now update the reset button to open the dialog instead of calling handleReset directly:

Now update the stop button to open the dialog:

Now add the AlertDialog components at the end of the JSX, just before the closing </div>:

Now update all E2E tests. Let me do all the edits in parallel.

Now update the stop dialog occurrences in this file. Let me find them.

Now update activity-stages.spec.ts. There are two occurrences - one in the helper and one in the "instructor can reset session" test.

Now update full-activity-flow.spec.ts. There are 3 occurrences - helper, session reset test, and cleanup.

Now update auto-advance-simple.spec.ts - 1 occurrence in helper.

Now update meeting-2026-02-03.spec.ts - 2 occurrences (helper and cleanup).

Now update mixed-stages.spec.ts - 4 occurrences (helper plus 3 cleanup/test spots).

Let me verify there are no remaining dialog patterns anywhere in these test files.

All browser dialog handlers have been removed. Also verify no remaining confirm( calls in the instructor component.

TypeScript compilation passes with no errors.

All done. Here's a summary of the changes:

Files modified:

1. apps/web/package.json - Added @radix-ui/react-alert-dialog: 1.1.15 (exact version)
2. apps/web/components/ui/alert-dialog.tsx (new) - Radix AlertDialog wrapper following the same pattern as dropdown-menu.tsx, exporting styled primitives
3. apps/web/components/mdx/activity-stage-instructor.tsx - Replaced two confirm() calls with AlertDialog state management:
   • Added showResetConfirm and showStopConfirm state
   • Reset/stop buttons now set state to open the dialog
   • handleReset/handleStop no longer call confirm() - they close the dialog and proceed
   • Two AlertDialog components in JSX with data-testid attributes for E2E testing
4. 6 E2E test files - Replaced all page.once("dialog", (dialog) => dialog.accept()) patterns with clicking the new confirm button via data-testid:
   • activity-stage-timing.spec.ts (4 occurrences)
   • activity-stages.spec.ts (2 occurrences)
   • full-activity-flow.spec.ts (3 occurrences)
   • auto-advance-simple.spec.ts (1 occurrence)
   • meeting-2026-02-03.spec.ts (2 occurrences)
   • mixed-stages.spec.ts (4 occurrences)

That was just a background task notification for a killed dev server process — not related to the current work. All changes are complete and TypeScript compiles cleanly.

No debugging statements or unnecessary logging in the changes. One untracked file (apps/web/components/ui/alert-dialog.tsx) which is the new component and should be committed.

This is a single logical change, so one commit is appropriate.

Committed as f54e558 on branch fixes. Working tree is clean.

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Done. Removed the "Use modal instead of browser confirm for session stop/reset" TODO from TODOS.md.

Clean change — just removing the completed TODO entry. No debugging or logging issues.

Committed as f135295.

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This is an MDX content structure issue, not a component bug. The components all work correctly.

The problem is in content/spring2026/meetings/2026-02-03-assessments-and-agents.mdx. That meeting uses roles={{ partner: "*" }}, meaning both group members get the "partner" role. The TextSubmission is placed inside <GroupRoleContent role="partner" index={1}>, which correctly limits it to only the index-1 partner — so only one of the two partners sees it.

Contrast with 2026-01-27-ai-scavenger-hunt.mdx, which uses roles={{ driver: 1, observer: "*" }} and places TextSubmission inside <GroupRoleContent role="observer"> — cleanly observer-only.

So the TODO's description ("visible to all group participants") doesn't match what's actually happening. The index={1} filtering does restrict visibility to one partner. The E2E test in meeting-2026-02-03.spec.ts explicitly verifies this at lines 154-160 — it confirms the index-1 partner sees the TextSubmission and the index-0 partner does not.

This TODO may have been filed before the index-based partner content routing was implemented (commit 8b1a77f), which would have resolved it. Want to remove this TODO as already fixed?

Done. Removed the TextSubmission visibility TODO — it was resolved by the index-based partner content routing.

Clean removal, no issues.

Committed as e561f34.

This one is also not a real bug. The architecture handles it correctly through React Context isolation.

Each ActivityStageClient wraps its children with <CurrentStageIndexProvider stageIndex={index}> (activity-stage-client.tsx:114,249), where index is the static position of that stage in the MDX (0, 1, 2, etc.). When TextSubmissionClient calls useCurrentStageIndex() (text-submission-client.tsx:48), it reads from this local context provider — not from the global session state that tracks the instructor's current stage.

So a TextSubmission in stage 2 always submits with stageIndex: 2, regardless of whether the instructor has advanced to stage 3. The concern in the TODO was valid to raise but the implementation is correct.

There is a separate minor TODO at text-submission-client.tsx:115 — sessionId: null, // TODO: Get actual session ID from context if needed — but that's about session tracking, not stage association.

Want to remove this TODO as well?

Done. Removed the text submission stage association TODO — the CurrentStageIndexProvider context isolation handles it correctly.

Clean change, no issues.

Committed as e02135a.

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This is still a real bug. The completion count on the instructor panel counts individual students, not groups.

Current behavior: If a pair of students completes a grouped stage, the instructor sees "2 completed" — one count per student, since each student's client independently calls the completion endpoint.

Expected behavior: It should show "1 completed" for that pair, since they're one group.

The root cause is in apps/api/src/routes/admin/activity-stages.ts:233-241 — the query simply does count() on activityStageCompletions rows grouped by stageIndex. There's no join to activityGroupMembers to deduplicate by group.

The fix isn't trivial though — the activityStageCompletions table has no groupId column and there's no direct link between a completion record and a group. It would require either:

1. Joining through users to groups: For grouped stages, count distinct groups where at least one member completed, rather than counting individual completions
2. Adding a groupId to completions: Store the group association at completion time so the count query can COUNT(DISTINCT groupId)

The challenge is the system doesn't currently know at the API level which stages are grouped vs individual — that information lives in the MDX content. Want me to dig into a specific approach for fixing this?

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Good point. Let me dig into how completion actually works across the different stage configurations — auto-complete on group formation, manual complete buttons, and whether both roles always get the complete button.

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There might be a simpler path that avoids the build-to-API pipeline entirely. The client already has the group context when it triggers a stage completion — group-activity-client.tsx calls activityStages.completeStage(currentStageIndex) and has access to the group ID at that point.

So the approach could be:

1. Add a nullable groupId column to activityStageCompletions
2. Pass the groupId through completeStage() when completing from within a group context (individual stages would leave it null)
3. In the count query, use COUNT(DISTINCT groupId) when groupId is present, fall back to COUNT(*) for null (individual stages)

That way the API doesn't need to know anything about the MDX structure — the client tells it "this completion belongs to group X" at the time of submission. No build-time extraction needed.

The one thing this doesn't cover is knowing the total number of groups (for showing "3 of 12 groups completed"), but enrollment count has the same limitation today for individuals.

Want me to plan out this approach, or do you see a reason the build-time metadata route is necessary?

Right — the activityGroups table tracks every group that's been formed. So we could show "3 of 12 groups completed" by querying activityGroups filtered by the relevant activityId and semester. The total group count is already in the database.

The missing piece is linking a stage's completions to the right set of groups. We'd need to know which activityId (the MDX id prop on GroupActivity) corresponds to which stage. But that relationship is also knowable at runtime — when the client sends the groupId with the completion, we can look up that group's activityId and use it to count total groups for that stage.

So the instructor display could show:

• Individual stage: "4 completed" (count of students)
• Grouped stage: "3 of 12 completed" (distinct groups completed / total groups for that activity)

Want me to plan this out?

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Now let me read a few critical files to confirm specific details before writing the plan.

Now let me check the student status endpoint response shape more closely, and look at the activity-stage-context interface.

Good, I have a clear picture now. Let me ask one clarifying question before writing the plan.

Now let me write the plan.