docs(desktop): document Recovery Mode and updated Auto-Update integration
- New Recovery Mode section: state model, detection paths, UI, loop prevention,
hidden-launch override, force-kill fix, inter-module wiring
- Auto-Update section extended with Recovery Integration subsection
- IPC tables updated: renderer-ready, recovery-action, get-recovery-state,
recovery-state-changed
- Preload Bridge table extended with 4 new methods
- Notifications section updated with optional onClick + setAppUserModelId