feat(ui): add descriptive page titles (Phase 1)

[strickvl]

This PR implements Phase 1 of descriptive page titles for the OSS dashboard.

What's included

• New usePageTitle hook that maps routes to descriptive titles.
• Hook is wired at RootLayout, so all pages (incl. public) update document.title.
• Coverage includes Overview, Projects, Stacks, Components, Pipelines, Pipeline Runs, Models, Artifacts, Run Templates, and granular Settings pages.

Why

• Clearer tab identification and improved accessibility/navigation.

How

• Lightweight, synchronous mapping using matchPath and routes constants.

Validation

• Navigate through the app and confirm titles (
  - ZenML Dashboard).
• Run pnpm lint and pnpm format.

Future Work

• Dynamic titles for detail routes resolved via React Query:
  • Runs: Run <name or shortId> using a useRun(runId)-style query.
  • Components detail/edit: Component <name or id>.
  • Pipelines by namespace: Pipeline <namespace>.
• Approach: start with a generic title; when query data resolves, refine the title once to avoid flicker.

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/add-page-titles

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[strickvl]

@Cahllagerfeld just was made aware of the decisions that any PRs where AI models are used will not get reviewed, so I would probably then just close this PR since it won't get merged then.

[strickvl]

Self-comment