feat(sync): persist shared project and session ordering

fix(web-session): add missing mobile composer scroll helpers

feat(file-manager): add recursive file search

feat(web-session): add Codex skill browser and CodeMirror composer

feat(ui): show project initials in session badges

feat(web-session): notify only when re-clicking the active draft

perf(api): optimize static asset cache headers

style(web-session): flatten sidebar session markers

fix(web-session): preserve Codex command groups across reasoning

Keep Codex compact-tool grouping intact when reasoning appears between command executions, filter empty Codex reasoning on the backend, and keep Claude behavior unchanged.

Merge remote-tracking branch 'origin/master'