fix(migration): preserve and recover legacy desktop sources (#1550)

* fix(migration): recover legacy desktop sources without replacing current data

* test(migration): cover legacy recovery IPC contracts

* test(migration): use static legacy Electron bootstrap

apps/electron-backend/src/app/api/main.preload.spec-data.ts

@@ -82,6 +82,18 @@ export const dbPreloadCases: PreloadInvokeCase[] = [
         channel: 'DB_UPSERT_APP_PLAYLIST',
         forwardedArgs: [playlist],
     },
+    {
+        method: 'dbRecoverLegacyPlaylists',
+        args: [],
+        channel: 'DB_RECOVER_LEGACY_PLAYLISTS',
+        forwardedArgs: [],
+    },
+    {
+        method: 'dbMigrateAppPlaylists',
+        args: [playlists],
+        channel: 'DB_MIGRATE_APP_PLAYLISTS',
+        forwardedArgs: [playlists],
+    },
     {
         method: 'dbUpsertAppPlaylists',
         args: [playlists],

apps/electron-backend/src/app/api/main.preload.ts

@@ -750,6 +750,10 @@ const electronApi: ElectronBridgeApi = {
         ipcRenderer.invoke('DB_GET_PLAYLIST', playlistId),
     dbUpsertAppPlaylist: (playlist: Playlist, _operationId?: string) =>
         ipcRenderer.invoke('DB_UPSERT_APP_PLAYLIST', playlist),
+    dbMigrateAppPlaylists: (playlists: Playlist[]) =>
+        ipcRenderer.invoke('DB_MIGRATE_APP_PLAYLISTS', playlists),
+    dbRecoverLegacyPlaylists: () =>
+        ipcRenderer.invoke('DB_RECOVER_LEGACY_PLAYLISTS'),
     dbUpsertAppPlaylists: (playlists: Playlist[]) =>
         ipcRenderer.invoke('DB_UPSERT_APP_PLAYLISTS', playlists),
     dbGetAppPlaylists: () => ipcRenderer.invoke('DB_GET_APP_PLAYLISTS'),