* feat(app): make crash recovery configurable
- Add an enabled-by-default persisted recovery preference and General settings control
- Stop recovery writes and remove the active document snapshot when disabled
- Suppress startup recovery discovery while the preference is disabled
- Cover disabled persistence and re-enable behavior
* fix(i18n): translate recovery preferences
* fix(app): serialize recovery disable cleanup
- Block re-enabled persistence until pending snapshot removal completes
- Preserve disable generations so stale cleanup cannot reset newer recovery state
- Display runtime-overridden recovery state in Settings
- Deep-clone nested preferences before updating recovery
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