Refactored all stores to follow consistent patterns and best practices while keeping MobX:

New Infrastructure:
- Created base-store.ts with StandardState base class and factory functions
- Added store-utils.ts with RequestDeduplicator, StoreError, and OptimisticUpdate helpers
- Added config.ts for MobX configuration and strict mode
- Created comprehensive README.md with architecture guide and examples

Server State Stores (API data):
- attachment.ts: Added request deduplication, error handling, computed properties, delete/clear methods
- workspace.ts: Added Theme type validation, computed memoization, improved initialization
- memo.ts: Enhanced with optimistic updates, request deduplication, structured errors
- user.ts: Fixed temporal coupling, added computed memoization, request deduplication

Client State Stores (UI state):
- view.ts: Added helper methods (toggleSortOrder, setLayout, resetToDefaults), input validation
- memoFilter.ts: Added utility methods (hasFilter, clearAllFilters, removeFiltersByFactor)

Improvements:
- Request deduplication prevents duplicate API calls (all server stores)
- Computed property memoization improves performance
- Structured error handling with error codes
- Optimistic updates for better UX (memo updates)
- Comprehensive JSDoc documentation
- Type-safe APIs with proper exports
- Clear separation between server and client state

All stores now follow consistent patterns for better maintainability and easier onboarding.

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- Update GetUser to accept both numeric IDs and username strings (users/{id} or users/{username})
- Implement CEL filter parsing for username-based lookups
- Update proto documentation to reflect dual lookup capability
- Simplify frontend user store to use GetUser instead of ListUsers filter
- Update ListUsers filter documentation to show current capabilities

- Replace fixed width (max-w-56) with responsive viewport-based width
- Use 90vw on mobile and max-w-md on desktop for better adaptability
- Add vertical scrolling with max-h-64 overflow-y-auto
- Increase grid columns to 8 on medium+ screens for better space utilization
- Ensures all reactions are accessible regardless of quantity

Fixes #5117
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- Updated memo and reaction filtering logic to use a unified engine for compiling filter expressions into SQL statements.
- Removed redundant filter parsing and conversion code from ListMemoRelations, ListReactions, and ListAttachments methods.
- Introduced IDList and UIDList fields in FindMemo and FindReaction structs to support filtering by multiple IDs.
- Removed old filter test files for reactions and attachments, as the filtering logic has been centralized.
- Updated tests for memo filtering to reflect the new SQL statement compilation approach.
- Ensured that unsupported user filters return an error in ListUsers method.

Signed-off-by: Ben Mitchinson <mitchinson.dev@gmail.com>
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feat(web): add accessible ConfirmDialog and migrate confirmations; and Markdown-safe descriptions (#5111)
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