* Add Language setting to Settings for per-app locale override
Uses UserDefaults AppleLanguages to override locale without changing
macOS system language. Picker shows System/English/Japanese with a
restart prompt when the selection changes.
* Address review feedback: guard relaunch and reset behavior
- Guard relaunchApp() against Process launch failure (don't terminate
if the new instance didn't start)
- Prevent restart dialog from firing during Reset All Settings
* Add localization requirement to CLAUDE.md
All user-facing strings must use String(localized:) with keys in
Localizable.xcstrings and translations for all supported languages.
* Fix relaunch: use detached shell so open survives app exit
The previous approach spawned open as a child process that could get
killed when the parent terminated. Now spawns a shell with sleep+open
that outlives the current process.
* Fix shell injection risk and SwiftUI state batching in language setting
- Pass bundle path via environment variable instead of interpolating
into shell command string
- Defer isResettingSettings=false to next run loop tick so onChange
handler reliably sees the guard during Reset All Settings
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