fix: show a page for unknown routes

[vansh-nagar]

Unknown URLs now render a dedicated not-found page inside the authenticated application shell instead of silently rewriting the address to /dashboard.

The page keeps the requested URL visible, names the path that failed, moves focus to its heading for assistive technology, and links to the dashboard and global search using the app-owned UI primitives.

Checks run:

• focused NotFoundComponent unit tests
• ESLint on the changed TypeScript files
• Prettier check on all changed files

Fixes #578

[Aman-Mittal]

@vansh-nagar Can you add a screenshot and e2e test

[Aman-Mittal]

@vansh-nagar Please rebase and add e2e tests for this

[Aman-Mittal]

NO e2e test

[github-actions]

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• a208376d test: cover unknown route recovery

How to fix: Set up commit signing, then re-sign the commits already on this branch. CONTRIBUTING.md has the setup.

Re-signing

# only for the identity reasons above (no_user / unverified_email):
git config user.email "you@example.com"

# re-sign every commit on this branch:
git rebase --exec 'git commit --amend --no-edit --reset-author -S' origin/main
git push --force-with-lease

Force-pushing is expected here — re-signing rewrites the commits, so their hashes change.

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[vnagar-oss]

Added the requested mocked Playwright coverage. The test opens an unknown URL, verifies the URL is preserved, checks the focused “Page not found” heading and requested-path message, then follows the dashboard recovery link. The focused browser test, E2E type-check, Prettier, and ESLint all pass.