feat: Add Close Others/Left/Right to chat tab context menu

[mabry1985]

Summary

Adds Close others, Close left, and Close right to the chat tab right-click context menu.

• apps/web/src/chat/bulkClose.ts (new): a pure, host-free sessionsToClose(sessions, anchorId, mode) helper that resolves the target tab ids for each mode in tab order. It always excludes the right-clicked anchor and any pinned tab (the pinned field is optional/forward-looking, so a current ChatSession is structurally accepted and never matches — pinned tabs are respected once pinning exists).
• ChatSurface.tsx: onTabContextMenu computes the three target sets and passes onCloseOthers/onCloseLeft/onCloseRight callbacks only when that direction has tabs to close. A small closeQueue state feeds each targeted session through the existing setPendingClose → ConfirmDialog flow one at a time — the next id promotes into the dialog as each resolves. This means goal-driving tabs still get their per-tab Stop/Detach confirmation, only ever one dialog is open (no dialog storm), and cancel aborts the remaining batch.
• contextMenu/registrations.tsx: the chat-tab menu renders the three bulk-close entries beneath Close chat, each shown only when its closure is supplied (so "Close left" never appears on the leftmost tab).

Tests: bulkClose.test.ts covers the targeting logic (others/left/right, anchor exclusion, edges, pinned exclusion, missing anchor, bare sessions); registrations.test.ts gains a suite asserting the menu shows/hides each entry by closure presence and that each entry invokes its own callback. Existing New chat / Rename / single Close behavior is untouched.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8c9fcad1-7302-4cb6-8d4a-285821a99967

📥 Commits

Reviewing files that changed from the base of the PR and between dffaba5 and 2c4f749.

📒 Files selected for processing (5)

• apps/web/src/chat/ChatSurface.tsx
• apps/web/src/chat/bulkClose.test.ts
• apps/web/src/chat/bulkClose.ts
• apps/web/src/contextMenu/registrations.test.ts
• apps/web/src/contextMenu/registrations.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/bd-3vh

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[protoreview]

QA panel review — PASS

code-review-structural · head 837667d0d042 · formal

[review-synthesizer completed: workflow code-review-structural:report]

The PR contains no findings from the review panel or the structural analysis pass. No defects were identified, and no findings were refuted or marked uncertain by the verifier.

Overall risk is low as no issues were surfaced. There is no "fix-first" item. The panel was in unanimous agreement. No gaps were reported other than the absence of findings.

[]

[protoreview]

Promoting the PASS verdict for head 837667d0d042: all checks terminal-green, zero unresolved review threads. (approve-on-green)

[protoreview]

QA panel review — PASS

code-review-structural · head 2c4f749e64d9 · formal

[review-synthesizer completed: workflow code-review-structural:report]

The change appears to be low-risk as no defects were identified by the review panel or the structural analysis pass. There are no priority fixes required, and there was no disagreement among the finders. The verification pass confirmed the absence of findings. No coverage gaps were noted.

[]

[protoreview]

Promoting the PASS verdict for head 2c4f749e64d9: all checks terminal-green, zero unresolved review threads. (approve-on-green)