fix(layout): make breadcrumb ancestors navigable

[pulkitxm]

Make breadcrumb ancestors clickable links that navigate, instead of plain text.

Evidence (bun test in apps/web, the touched package):

apps/web/src/lib/breadcrumbs.test.ts:
 8 pass  0 fail  8 expect() calls

@orbit/web test: Ran 498 tests across 80 files. Exited with code 0

A crumb links only when its accumulated path resolves to a real route, so unrouted parents (/team, /issue) and the current page stay text and nothing links to a 404. Live dev-server screenshot skipped: next dev currently 500s on every route from an unrelated Turbopack + react-email/prettier module-externalization issue, present on main.

[greptile-apps]

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Review details

⚙️ Run configuration

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Run ID: 0a302482-9ea0-4a1e-a6fa-4f0fd9478616

📥 Commits

Reviewing files that changed from the base of the PR and between 6e7001f and c84ad6b.

📒 Files selected for processing (4)

• apps/web/src/components/layout/top-bar.tsx
• apps/web/src/components/layout/workspace-shell.tsx
• apps/web/src/lib/breadcrumbs.test.ts
• apps/web/src/lib/breadcrumbs.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/breadcrumb-navigation

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