refactor: standardize loading indicators by using Spinner for route fallbacks and specializing Skeleton for memo lists

refactor: streamline MemoView component and related hooks, removing unused code and integrating user data

- Deleted MemoContentContext and its associated types.
- Updated Tag and TaskListItem components to use MemoViewContext instead.
- Refactored MemoContent component to eliminate context provider and directly use derived values.
- Simplified MemoViewContext to only include essential data.
- Enhanced error handling in various components by introducing a centralized error handling utility.
- Improved type safety across components and hooks by refining TypeScript definitions.
- Updated remark plugins to enhance tag parsing and preserve node types.

Signed-off-by: boojack <stevenlgtm@gmail.com>

- Remove outdated CLAUDE.md with obsolete architecture references
- Create comprehensive AGENTS.md covering:
  - Backend: Go, gRPC, Connect RPC, store layer, migrations
  - Frontend: React, React Query, Context API, state management
  - Development commands, workflows, and testing patterns
  - Code conventions, configuration, CI/CD, and security notes

Replace dynamic hook mapping with useMemoComments hook to fetch all comments
via listMemoComments API, ensuring consistent hook order across renders and
fixing page load failure after comment creation.

The translation files ca.json and gl.json existed but weren't registered in the locales array, preventing users from selecting these languages.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

This commit combines multiple improvements to the React Query migration:

Performance Optimization:
- Increase default staleTime from 10s to 30s for better performance
- Reduces unnecessary network requests while maintaining data freshness

Error Handling:
- Add ErrorBoundary component with user-friendly error UI
- Integrated at app root level for comprehensive coverage
- Provides error details and reload option

Documentation:
- Add docs/auth-architecture.md explaining AuthContext design decisions
- Document why AuthContext is preferred over React Query for current user

Code Cleanup:
- Remove all JSDoc comments from hooks and components
- Keep essential inline comments for clarity
- Simplifies code readability

Files modified:
- src/lib/query-client.ts - Optimized staleTime
- src/main.tsx - Added ErrorBoundary wrapper
- src/components/ErrorBoundary.tsx - New component
- src/hooks/useMemoQueries.ts - Removed JSDoc
- src/hooks/useUserQueries.ts - Removed JSDoc
- src/components/PagedMemoList/PagedMemoList.tsx - Removed JSDoc
- docs/auth-architecture.md - New documentation

All changes verified with TypeScript compilation and production build.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Signed-off-by: ghose <704948+xmgz@users.noreply.github.com>

Optimizes React Query migration with performance and consistency improvements:

Performance:
- Memoize AuthContext and InstanceContext provider values to prevent unnecessary re-renders
- Convert InstanceContext getter functions to useMemo hooks
- Fix refetchSettings to avoid state dependency that caused frequent recreations

Type Safety:
- Replace 'any' types in useAttachmentQueries with proper protobuf types
- Add Attachment and ListAttachmentsRequest type imports

Query Key Consistency:
- Replace hardcoded ["users", "stats"] with userKeys.stats() factory function
- Ensures consistent cache key management across mutations

Developer Experience:
- Rename unused useCurrentUser to useCurrentUserQuery to avoid confusion
- Add documentation explaining AuthContext-based vs React Query current user hooks
- Update internal references in useNotifications and useTagCounts

All changes verified with TypeScript compilation and build tests.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

- Wrap actions.toggleFocusMode() with dispatch() call
- Create toggleFocusMode helper function for callbacks
- Fix focus mode not toggling due to action not being dispatched

- Add useFocusMode hook to lock body scroll in focus mode
- Add 'f' key keyboard shortcut to toggle focus mode
- Add FocusModeExitButton inside editor
- Import and wire up all focus mode components and hooks
- Update useKeyboard to handle focus mode toggle

- Import and use FOCUS_MODE_STYLES from constants
- Apply proper fixed positioning, shadow, and spacing in focus mode
- Add transition animation for smooth mode switching
- Replace empty 'focus-mode' class with actual Tailwind utilities

- Add back Tailwind utility classes for proper layout
- Restore padding, border, background, and flex styles
- Fix missing styles on memo-editor-wrapper element

- Add back descriptive comments removed by editor refactoring commit
- Restore original timestamp calculation format in MemoHeader
- Improve code readability with section comments

Complete refactoring of MemoView components for better code quality:

- Split useMemoViewState into individual hook files (useMemoActions,
  useKeyboardShortcuts, useNsfwContent, useImagePreview, useMemoCreator)
  for single responsibility principle
- Consolidate types closer to usage - move hook-specific types to
  respective files, keep only component props in shared types.ts
- Optimize context with separate static/dynamic memoization to reduce
  unnecessary re-renders
- Simplify barrel exports to only expose public API (MemoView component
  and MemoViewProps type)
- Add comprehensive JSDoc documentation to all public APIs with usage
  examples

Benefits:
- Better maintainability: each hook file has one clear purpose
- Improved performance: context optimization prevents unnecessary re-renders
- Enhanced developer experience: clear documentation and encapsulation
- Cleaner architecture: public API is minimal, internal details hidden

All automated checks pass (TypeScript compilation, linter, production build).