feat(sync-ui): main-process runtime, window, tray entry, CLI wiring for sync window

src/main/runtime/cli-command-context.test.ts

@@ -58,6 +58,7 @@ function createDeps() {
       runYoutubePlaybackFlow: async () => {},
       openYomitanSettings: () => {},
       openConfigSettingsWindow: () => {},
+      openSyncUiWindow: () => {},
       cycleSecondarySubMode: () => {},
       openRuntimeOptionsPalette: () => {},
       printHelp: () => {},