Fix PR and issue detail tab titles

[stylessh]

Summary

Fix stale browser tab titles on PR, review, and issue detail pages so they update to the fetched entity title instead of staying on fallback labels like PR #N.

Changes

• add a shared usePageTitle hook that applies formatPageTitle once detail data is loaded
• use the hook in PR detail, PR review, and issue detail pages so the tab title reflects the actual PR or issue title after client-side fetches
• add regression coverage for formatPageTitle

Test Plan

• pnpm --filter @diffkit/dashboard exec vitest run src/lib/seo.test.ts
• pnpm --filter @diffkit/dashboard check-types

Screenshots

Not applicable.

Before	After
`PR #N	DiffKitorIssue #N

Summary by CodeRabbit

• New Features

  • Dynamic browser tab titles now reflect the issue or pull request being viewed, providing better context while navigating between pages. Review pages display "Review: " prefix for clarity.

• Tests

  • Added test coverage for page title formatting functionality, verifying proper formatting with app name suffix.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0a82c82e-2d52-4efa-9656-1d0051d737d3

📥 Commits

Reviewing files that changed from the base of the PR and between 6c2b8f0 and 50e5498.

📒 Files selected for processing (5)

• apps/dashboard/src/components/issues/detail/issue-detail-page.tsx
• apps/dashboard/src/components/pulls/detail/pull-detail-page.tsx
• apps/dashboard/src/components/pulls/review/review-page.tsx
• apps/dashboard/src/lib/seo.test.ts
• apps/dashboard/src/lib/use-page-title.ts

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📝 Walkthrough

Walkthrough

Introduces page title handling across issue detail, pull request detail, and pull request review pages by creating a new usePageTitle hook that dynamically updates the browser tab title based on fetched issue or PR data. No existing data fetching or control flow logic is altered.

Changes

Cohort / File(s)	Summary
Page Title Hook apps/dashboard/src/lib/use-page-title.ts	New exported hook that accepts a title string and updates document.title via formatPageTitle whenever the title changes.
Page Components apps/dashboard/src/components/issues/detail/issue-detail-page.tsx, apps/dashboard/src/components/pulls/detail/pull-detail-page.tsx, apps/dashboard/src/components/pulls/review/review-page.tsx	Imported and invoked usePageTitle hook to dynamically set page titles based on issue/PR data; review page prefixes title with "Review: ".
SEO Tests apps/dashboard/src/lib/seo.test.ts	Added test suite for formatPageTitle to verify it appends `"

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Suggested labels

tembo

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: fixing tab titles for PR and issue detail pages to display actual entity titles instead of fallback labels.
Description check	✅ Passed	The description is well-structured and complete, covering the summary, changes, test plan with verification checkmarks, and before/after context despite screenshots not being applicable.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch stylessh/fix-pr-tab-titles

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