* fix: add 404 not found page
Closes#320
- Add custom 404 page matching the app's design system
- Include PatternedBackground and proper dark mode support
- Provide navigation links to homepage and boards
- Add i18n support with @lingui/react
* fix: add 404 redirects for non-existent boards and cards
Add useEffect hooks to redirect to /404 page when:
- Board does not exist in board view
- Card does not exist in card view
This addresses the cases mentioned in maintainer feedback where
the static 404 page wasn't being used for dynamic routes.
Addresses review feedback on PR #349
* feat: redirect to 404 for non-existent public workspaces and cards
Per maintainer feedback:
- Add redirect logic to public boards view when workspace doesn't exist
- Add redirect logic to public card modal when card doesn't exist
- Uses error?.data?.code === 'NOT_FOUND' check as suggested
- Closes modal before redirecting for card modal
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