Problem:
The Explore page filter was sending visibility filter as:
  visibility in ["3", "2"]
when it should send:
  visibility in ["PUBLIC", "PROTECTED"]

The backend CEL filter parser expects string enum names, not numeric values.
This caused the Explore page to return no memos even when public memos existed.

Solution:
- Added getVisibilityName() helper to convert Visibility enum values to string names
- Updated useMemoFilters to use getVisibilityName() when building visibility filter
- Follows same pattern as existing getInstanceSettingKeyName() and getUserSettingKeyName()
- Added validation to warn on invalid enum values

Files changed:
- web/src/store/common.ts: Add getVisibilityName() helper with validation
- web/src/hooks/useMemoFilters.ts: Use getVisibilityName() in visibility filter

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

Problem:
The codebase supports both native gRPC and Connect-RPC protocols, but auth
service was using grpc.SetHeader() which only works for native gRPC. This
caused "failed to set grpc header" errors when using Connect-RPC clients
(browsers using nice-grpc-web).

Solution:
- Created HeaderCarrier pattern for protocol-agnostic header setting
- HeaderCarrier stores headers in context for Connect-RPC requests
- Falls back to grpc.SetHeader for native gRPC requests
- Updated auth service to use SetResponseHeader() instead of grpc.SetHeader()
- Refactored Connect wrappers to use withHeaderCarrier() helper to eliminate
  code duplication

Additional fixes:
- Allow public methods when gRPC metadata is missing in ACL interceptor
- Properly handle ParseSessionCookieValue errors instead of ignoring them
- Fix buildSessionCookie to gracefully handle missing metadata

Files changed:
- server/router/api/v1/header_carrier.go: New protocol-agnostic header carrier
- server/router/api/v1/auth_service.go: Use SetResponseHeader, handle missing metadata
- server/router/api/v1/connect_services.go: Use withHeaderCarrier helper
- server/router/api/v1/acl.go: Allow public methods without metadata
- server/router/api/v1/connect_interceptors.go: Handle ParseSessionCookieValue errors

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

Frontend was incorrectly using numeric enum values (e.g., 1, 2, 3) instead
of string names (e.g., "GENERAL", "STORAGE") when constructing API resource
paths. This caused the backend to fail with "unsupported instance setting
key: INSTANCE_SETTING_KEY_UNSPECIFIED" errors during initialization.

Changes:
- Add helper functions in store/common.ts to convert enum values to names
  - getInstanceSettingKeyName() and buildInstanceSettingName()
  - getUserSettingKeyName() and buildUserSettingName()
- Update instance store to use string enum names in API calls
- Update user store to use string enum names in API calls
- Update all components to use new helper functions for setting names

Fixes enum string conversion for:
- InstanceSetting_Key (6 locations)
- UserSetting_Key (2 locations)

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

Fixes #5319. Checkboxes inside code blocks were incorrectly counted when
toggling tasks, causing the wrong checkbox to be checked. Replaced regex-based
task detection with mdast AST parsing which properly ignores code block content.

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

- Extract preference logic into dedicated hooks (useUserLocale, useUserTheme)
- Add applyLocaleEarly() for consistent early application
- Remove applyUserPreferences() from user store (now redundant)
- Simplify App.tsx by moving effects to custom hooks
- Make locale/theme handling consistent and reactive
- Clean up manual preference calls from sign-in flows

Fixes locale not overriding localStorage on user login.
Improves maintainability with better separation of concerns.

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

Signed-off-by: xiaolinny <xiaolincode@outlook.com>

Add custom remark plugin to prevent setext headers (headers using === or --- underlines) from being recognized by the markdown parser. The plugin disables the setextUnderline construct at the micromark parser level.

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

Migrates attachment and avatar binary serving from gRPC endpoints to a new dedicated HTTP fileserver package, fixing Safari video playback issues and improving architectural separation.

Key changes:
- Created server/router/fileserver package for all binary file serving
- Removed GetAttachmentBinary and GetUserAvatar gRPC endpoints from proto
- Implemented native HTTP handlers with full range request support
- Added authentication support (session cookies + JWT) to fileserver
- New avatar endpoint supports lookup by user ID or username
- Eliminated duplicate auth constants (imports from api/v1)

HTTP endpoints:
- Attachments: /file/attachments/:uid/:filename (unchanged URL)
- Avatars: /file/users/:identifier/avatar (new URL format)

This fixes Safari video/audio playback by using http.ServeContent() which properly handles HTTP 206 Partial Content responses and range request headers.

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

Security improvements:
- Add rehype-sanitize for XSS protection in markdown content
- Remove DOMPurify and deprecated __html code block feature
- Extract sanitize schema to constants with comprehensive documentation

Maintainability improvements:
- Extract SANITIZE_SCHEMA to constants.ts for better organization
- Create utils.ts with shared code extraction utilities
- Refactor CodeBlock and MermaidBlock to use shared utilities
- Rename PreProps to CodeBlockProps for clarity
- Reduce code duplication across components

Dependency cleanup:
- Remove explicit katex dependency (now transitive via rehype-katex)
- Remove @matejmazur/react-katex (unused)
- Remove dompurify (replaced by rehype-sanitize)
- Update vite config to remove katex-vendor chunk

Changes: 7 files changed, 84 insertions(+), 100 deletions(-)

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

Integrates remark-math and rehype-katex plugins to enable LaTeX mathematical expressions in memos. Users can now write inline math ($...$) and display math ($$...$$) using standard LaTeX syntax.

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

Remove theme and locale from instance settings to eliminate duplication and
simplify the codebase. These are user-specific preferences and should only
exist in user settings, not instance-wide settings.

Backend changes:
- Remove theme from InstanceGeneralSetting proto
- Remove locale from InstanceCustomProfile proto
- Update instance service converters to remove theme/locale handling
- Simplify RSS feed to use static locale

Frontend changes:
- Remove theme/locale from instanceStore state
- Create unified initialization flow with clear fallback priority:
  * Theme: user setting → localStorage → system preference
  * Locale: user setting → browser language
- Add applyUserPreferences() to centralize theme/locale application
- Simplify App.tsx by removing redundant state synchronization
- Update all components to use new helper functions:
  * getThemeWithFallback() for theme resolution
  * getLocaleWithFallback() for locale resolution
- Remove theme/locale selectors from instance profile dialog

Theme utilities refactor:
- Organize code into clear sections with JSDoc comments
- Extract localStorage operations into getStoredTheme/setStoredTheme helpers
- Split DOM manipulation into focused functions
- Improve type safety with Theme and ResolvedTheme types
- Reduce code duplication and improve maintainability

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

Previously, clicking multiple tags would add them all as active filters. Now clicking a new tag automatically clears any existing tag filters before applying the new one, ensuring only one tag can be filtered at a time. Clicking an already-active tag still deselects it.

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

Complete removal of migration_history system in favor of instance_setting based schema versioning.

Changes:
- Remove migration_history table creation from all LATEST.sql files
- Delete all migration_history model and implementation files (~300 lines)
- Remove FindMigrationHistoryList and UpsertMigrationHistory from Driver interface
- Replace complex backward compatibility functions with simple version check
- Update health check to use instance_setting instead of migration_history
- Simplify checkMinimumUpgradeVersion to detect pre-v0.22 installations

Breaking change:
Users on versions < v0.22.0 (May 2024) must upgrade to v0.25.x first before upgrading to this version.
Clear error message with upgrade instructions will be shown for old installations.

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

- Wrap all setter functions in useMemoEditorState with useCallback to ensure stable references
  This prevents infinite loops when setters are used in useEffect dependencies (fixes "Maximum update depth exceeded" error)
- Extract MobX observable values in useMemoFilters and useMemoSorting before using them in useMemo dependencies
  This prevents React from tracking MobX observables directly, improving reliability
- Add comprehensive documentation explaining the design decisions for future maintainability

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

Add MessageType filter to FindInbox to exclude legacy VERSION_UPDATE
notifications from inbox queries. This resolves the issue where users
saw notification counts but no items displayed, as VERSION_UPDATE
entries cannot be rendered in the new UserNotification API.

Changes:
- Add MessageType field to FindInbox struct for database-level filtering
- Implement JSON extraction filters in SQLite, MySQL, and PostgreSQL drivers
- Update ListUserNotifications to filter MEMO_COMMENT type at store level

This approach improves performance by filtering at the database rather
than in application code, reducing unnecessary data transfer for users
with many legacy inbox entries.

Fixes #5278

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

Major performance and standards compliance improvements to RSS feed generation:

Performance optimizations:
- Fix N+1 query problem by batch loading attachments (101 queries → 2-3)
- Add in-memory caching with 1-hour TTL and LRU eviction
- Implement ETag-based conditional requests (304 Not Modified)
- Add database-level pagination with LIMIT clause
- Clean up expired cache entries to prevent memory leaks

RSS 2.0 compliance:
- Add item titles extracted from memo content
- Include both description and content:encoded fields
- Add author information (name and email)
- Set proper Last-Modified headers
- Use specific application/rss+xml content type

Code quality:
- Fix potential index out of bounds panic in title generation
- Improve markdown heading stripping with regex (handles # to ######)
- Add proper HTTP caching headers (Cache-Control, ETag, Last-Modified)
- Thread-safe cache implementation with RWMutex
- Better error handling and edge case coverage

The RSS backend now follows industry best practices with optimal
performance, full standards compliance, and production-ready reliability.

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

Implements critical OAuth 2.0 security improvements to protect against authorization code interception attacks and improve provider compatibility:

- Add PKCE (RFC 7636) support with SHA-256 code challenge/verifier
- Fix access token extraction to use standard field instead of Extra()
- Add OAuth error parameter handling (access_denied, invalid_scope, etc.)
- Maintain backward compatibility for non-PKCE flows

This brings the OAuth implementation up to modern security standards as recommended by Auth0, Okta, and the OAuth 2.0 Security Best Current Practice (RFC 8252).

Backend changes:
- Add code_verifier parameter to ExchangeToken with PKCE support
- Use token.AccessToken for better provider compatibility
- Update proto definition with optional code_verifier field

Frontend changes:
- Generate cryptographically secure PKCE parameters
- Include code_challenge in authorization requests
- Handle and display OAuth provider errors gracefully
- Pass code_verifier during token exchange

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

Co-authored-by: huangyouchuan <huangyouchuan@letu.com>

This commit refactors MemoView and MemoEditor components for better
maintainability, introducing React Context, custom hooks, and improved
folder structure.

MemoView improvements:
- Introduce MemoViewContext to eliminate prop drilling
- Reduce MemoHeader props from 18 to 8
- Reduce MemoBody props from 9 to 4
- Extract custom hooks: useMemoViewDerivedState, useMemoEditor,
  useMemoHandlers for better separation of concerns
- Fix React hooks ordering bug in edit mode

MemoEditor improvements:
- Extract state management into useMemoEditorState hook
- Extract keyboard handling into useMemoEditorKeyboard hook
- Extract event handlers into useMemoEditorHandlers hook
- Extract initialization logic into useMemoEditorInit hook
- Reduce main component from 461 to 317 lines (31% reduction)

Folder structure cleanup:
- Move SortableItem to memo-metadata (correct location)
- Move ErrorBoundary to components folder
- Flatten Toolbar/InsertMenu structure (remove unnecessary nesting)
- Consolidate hooks in main hooks folder
- Consolidate types in main types folder

Benefits:
- Better separation of concerns
- Improved testability
- Easier maintenance
- Cleaner code organization
- No functionality changes

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

- Remove enable_link_preview field from proto definitions
- Remove setting UI from MemoRelatedSettings component
- Remove translations from all 33 locale files
- Regenerate proto files

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

- Remove disable_markdown_shortcuts field from proto definitions
- Remove setting UI from MemoRelatedSettings component
- Enable markdown shortcuts permanently in MemoEditor
- Remove translations from all 32 locale files
- Fix TypeScript error in useMemoSave hook by using typed translation function

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

- Added MemoView component to display a single memo card with full functionality including creator info, memo content, attachments, reactions, and comments.
- Created MemoBody and MemoHeader subcomponents to separate concerns and improve maintainability.
- Introduced custom hooks for managing memo actions, keyboard shortcuts, NSFW content visibility, and image preview.
- Implemented reaction handling with new ReactionSelector and ReactionView components.
- Added TypeScript types for better type safety and clarity.
- Established constants for memo card styling and keyboard shortcuts.
- Removed legacy ReactionSelector and ReactionView components from the previous structure.

- Implemented LocationDialog component for selecting and entering location coordinates.
- Created useLocation hook to manage location state and updates.
- Added LocationState type for managing location data.
- Introduced useLinkMemo hook for linking memos with search functionality.
- Added VisibilitySelector component for selecting memo visibility.
- Refactored MemoEditor to integrate new hooks and components for improved functionality.
- Removed obsolete handlers and streamlined memo save logic with useMemoSave hook.
- Enhanced focus mode functionality with dedicated components for overlay and exit button.