Revert to v1.5.49 base + fix "Ausgewählte Downloads starten"

- Restore all source files from v1.5.49 (proven stable on both servers)
- Add startPackages() IPC method that starts only specified packages
- Fix context menu "Ausgewählte Downloads starten" to use startPackages()
  instead of start() which was starting ALL enabled packages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/shared/ipc.ts

@@ -12,6 +12,7 @@ export const IPC_CHANNELS = {
   RESOLVE_START_CONFLICT: "queue:resolve-start-conflict",
   CLEAR_ALL: "queue:clear-all",
   START: "queue:start",
+  START_PACKAGES: "queue:start-packages",
   STOP: "queue:stop",
   TOGGLE_PAUSE: "queue:toggle-pause",
   CANCEL_PACKAGE: "queue:cancel-package",
@@ -36,6 +37,5 @@ export const IPC_CHANNELS = {
   EXTRACT_NOW: "queue:extract-now",
   GET_HISTORY: "history:get",
   CLEAR_HISTORY: "history:clear",
-  REMOVE_HISTORY_ENTRY: "history:remove-entry",
-  CHECK_ACCOUNT: "app:check-account"
+  REMOVE_HISTORY_ENTRY: "history:remove-entry"
 } as const;

src/shared/preload-api.ts

@@ -3,7 +3,6 @@ import type {
   AppSettings,
   DuplicatePolicy,
   HistoryEntry,
-  ProviderAccountInfo,
   SessionStats,
   StartConflictEntry,
   StartConflictResolutionResult,
@@ -26,6 +25,7 @@ export interface ElectronApi {
   resolveStartConflict: (packageId: string, policy: DuplicatePolicy) => Promise<StartConflictResolutionResult>;
   clearAll: () => Promise<void>;
   start: () => Promise<void>;
+  startPackages: (packageIds: string[]) => Promise<void>;
   stop: () => Promise<void>;
   togglePause: () => Promise<boolean>;
   cancelPackage: (packageId: string) => Promise<void>;
@@ -49,7 +49,6 @@ export interface ElectronApi {
   getHistory: () => Promise<HistoryEntry[]>;
   clearHistory: () => Promise<void>;
   removeHistoryEntry: (entryId: string) => Promise<void>;
-  checkAccount: (provider: string) => Promise<ProviderAccountInfo>;
   onStateUpdate: (callback: (snapshot: UiSnapshot) => void) => () => void;
   onClipboardDetected: (callback: (links: string[]) => void) => () => void;
   onUpdateInstallProgress: (callback: (progress: UpdateInstallProgress) => void) => () => void;

src/shared/types.ts

@@ -269,15 +269,6 @@ export interface HistoryEntry {
   outputDir: string;
 }
 
-export interface ProviderAccountInfo {
-  provider: DebridProvider;
-  username: string;
-  accountType: string;
-  daysRemaining: number | null;
-  loyaltyPoints: number | null;
-  error?: string;
-}
-
 export interface HistoryState {
   entries: HistoryEntry[];
   maxEntries: number;