Misc: tab context menu, auth fix, branch deletion timeline, optimistic mutation fix

[stylessh]

Summary

• Tab context menu: right-click tabs to close, close others, or close tabs to the right (single shared ContextMenu instance). Also adds horizontal wheel-scroll on the tab bar.
• Auth fix: all write operations (labels, reviewers, reviews, branch updates, etc.) now use the user's token instead of the app installation token, so GitHub correctly attributes actions to the user.
• Optimistic mutation fix: skip immediate query invalidation when optimistic updates are applied, preventing the flash where items disappear and reappear when the refetch returns stale data before GitHub propagates the write.
• Branch deletion in timeline: head_ref_deleted and head_ref_restored events now appear in the activity feed sorted by date. Merge event is also sorted into the timeline instead of hardcoded at the bottom. Delete branch CTA persists across refresh via server-derived headRefDeleted field. Cache busting and webhook delete event handling added.
• Context menu font size: 13px for consistency.

Test plan

• Right-click a tab to verify context menu appears with close/close others/close right options
• Add a label or reviewer and confirm it stays visible without flashing
• Verify label/reviewer additions show your username (not bot) on GitHub
• Merge a PR, delete the branch, refresh — verify delete CTA is gone and timeline shows deletion event in correct order
• Scroll vertically over the tab bar to confirm horizontal scrolling works

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	diffkit	7b5aeb6	Commit Preview URL Branch Preview URL	Apr 11 2026, 05:37 PM