Remove SwiftyBeaver and rebuild logging on OSLog

[chihchy]

Summary

Removes the SwiftyBeaver dependency entirely and rebuilds the app's logging stack on Apple's unified logging (OSLog/Logger). Replaces the old file-based log viewer with a live in-app App Activity Logs feature backed by a new LogsClient module, and resyncs all localizations.

What changed

Logging backend

• Drop the SwiftyBeaver package dependency and remove all of its logging plumbing.
• Migrate every module to OSLog: AppFeature, AppTools, AppModels, DownloadClient, DatabaseClient, NetworkingFeature, ParserFeature, ReadingFeature, BackgroundProcessingClient, SettingFeature (WebView + LoginReducer).
• Replace the SwiftyBeaverExt module with OSLogExt (shared app identifier), and rename LoggerClient → LogsClient.
• Declare a private let logger in each file that logs; drop noisy UI-layer log calls.

App Activity Logs feature

• New AppActivityLog model and RunLogFile (identified by file URL) for per-run log files; app activity events logged at notice level.
• New LogsClient module and a rebuilt log viewer with a live pump plus a Run picker (Current section + sheet, run time shown as HHmm, capped at 5 runs including current) and an "Open in Files" button.
• Rename the General entry to "App activity logs"; reset the launch count per day; fix the title and empty-page baseline.
• Delete the old LogsReducer/LogsView and the dead file-based log APIs in FileClient, LibraryClient, and ApplicationClient.

Localizations

• Resync every locale to match en and add the new logs keys.
• Drop the Localizable.strings file headers and the "Copied from" attribution comments.

Housekeeping

• Move AppTools helpers under an Extensions/ folder.