## Summary
Part 1 of 4 stacked PRs continuing the Projects work from #6003.
- The Projects overview now follows the selected section: the right-hand
context pod stays visible across the Projects / Repositories / Reviews /
Tasks / Channels tabs and shows section-specific people, stats, and
contribution graphs, so it reads as live context rather than a detached
summary.
- Entity list rows are consolidated onto one compact line (title first,
icons after, aligned dates/counts), shared across projects,
repositories, PRs, issues, and channel lists via `ProjectEntityListRow`.
- New `projectRelatedChannels` helper resolves the channels a project is
discussed in for the overview.
Follow-ups in this stack: part 2 (selectable workspaces), part 3
(context-aware collaboration), part 4 (navigation & detail-page polish).
## Test plan
- [x] Desktop unit tests (`pnpm test`) — pass
- [x] TypeScript (`tsc --noEmit`), Biome, clippy — clean via pre-push
gate
- [x] Playwright specs updated for the new overview behavior
(`projects-v3-screenshots.spec.ts`, `sidebar.spec.ts`) — pass locally in
the smoke project
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Signed-off-by: Thomas Petersen <thomasp@squareup.com>