* fix(files): refresh open file content after external edits
Previously, opening a file in the Files view and then editing it externally
(e.g. via CLI or another editor) would show stale content. Even closing and
reopening the file returned cached content — a full page reload was required.
Root causes:
1. The in-memory readFile cache used path-only hits, with no metadata
validation. External edits were invisible until the cache was evicted.
2. No polling mechanism existed to detect external changes to the open file.
Fix:
- Add mtimeMs to statFile across all runtimes (web, VS Code, desktop).
- Cache layer (RuntimeAPIProvider): validate cache hits against current stat
metadata (mtimeMs + size). On miss, use stat→read→stat to avoid TOCTOU.
- UI layer (FilesView): poll the open file every 2s; on detected change, set
loadedFilePath=null to trigger the existing load effect once (no double
reload). Skip polling when tab is hidden or editor has unsaved changes.
- After save, refresh the stat ref so the next poll doesn't see a spurious
change from the save itself.
Addresses review feedback from PR #827 (double reload + TOCTOU).
* fix(files): address P2 review findings
- readFreshFile retry now uses stat→read→stat to maintain TOCTOU
protection during the retry path (not just the initial read).
- Replace isDirty in polling effect deps with isDirtyRef to avoid
unnecessary interval teardown/restart on every edit/save cycle.
Add file management API and UI components
Implement directory listing, search and CRUD operations in desktop backend
Expose new Files API on frontend to list, search, and modify files
- Introduced `readFile` and `writeFile` methods in the FilesAPI for reading and writing files.
- Added `execCommands` method to execute shell commands in a specified directory.
- Implemented `runWorktreeSetupCommands` function to handle setup commands for worktrees.
- Created `OpenChamberConfig` service for managing project-specific configuration, including setup commands.
- Enhanced `useMultiRunStore` to save and execute setup commands during multi-run creation.
- Updated VSCode bridge to handle file read/write and command execution requests.
- Added server endpoints for reading and writing files, and executing shell commands.
jwcrystal