Group timeline events and show conflicting files in merge card

[stylessh]

Summary

Improves the activity timeline by grouping consecutive label and review request events into single entries, and adds conflicting file path display to the PR merge status card.

Changes

• Group consecutive label add/remove events by the same actor (within 60s) into a single timeline entry (e.g. "stylessh added bug docs and removed question labels")
• Group consecutive review request events the same way (e.g. "stylessh requested review from user1, user2")
• Shared grouping utility in grouped-label-event.tsx used by both issue and PR activity timelines
• Detect conflicting files by cross-referencing PR files with base branch changes when mergeableState is dirty
• Display conflicting file paths in a collapsible section in the merge card, matching the checks section pattern
• Added GroupedLabelEvent, GroupedReviewRequestEvent types and conflictingFiles field to PullStatus

Test Plan

• Open an issue/PR with multiple label changes by the same user — verify they appear as a single grouped entry
• Open a PR with multiple review requests — verify they appear grouped
• Open a PR with merge conflicts — verify the conflicts section shows a collapsible list of conflicting file paths
• Open a PR without conflicts — verify "No conflicts with base branch" still renders correctly
• Verify single label/review events still render individually (no grouping for lone events)

Screenshots

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	diffkit	69f371c	Apr 14 2026, 01:07 AM