- Add HDR detection utilities for wide color gamut formats (HEIC, HEIF, WebP)
- Apply colorSpace attribute to image/video elements for HDR-capable files
- Update frontend components (AttachmentCard, PreviewImageDialog, AttachmentList)
- Expand backend thumbnail generation to support HEIC, HEIF, WebP formats
- Add Color-Gamut response headers to advertise wide gamut support
- Extend avatar MIME type validation for HDR formats

Supported formats:
- Images: HEIC, HEIF, WebP, PNG, JPEG
- Videos: MP4, QuickTime, Matroska, WebM (VP9 Profile 2)

Browser support:
- Safari 14.1+, Chrome 118+, Edge 118+
- Gracefully degrades to sRGB on unsupported browsers

- Remove shared memo-metadata folder
- Move metadata display components (AttachmentList, LocationDisplay, RelationList) to MemoView/components/metadata
- Move attachment types and utilities (LocalFile, AttachmentItem, toAttachmentItems) to MemoEditor/types/attachment
- Simplify AttachmentList and AttachmentCard to work directly with Attachment proto
- Update all imports across MemoEditor and MemoView components
- Better separation of concerns: MemoView handles display, MemoEditor handles local files + attachments

Co-authored-by: Guillaume Reichenbach <guillaume.reichenbach@reflet-digital.com>

Signed-off-by: Lynchi <77619755+Linqi1234@users.noreply.github.com>

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- Remove outdated CLAUDE.md with obsolete architecture references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>