feat(learning): replace courses with project catalog

src/lib/api-client.ts

@@ -57,12 +57,6 @@ const UNIFIED_CHANNELS = new Set<string>([
   'update:cancelAutoInstall',
 ]);
 
-const ALLOWED_EVENT_CHANNELS = new Set([
-  'learning:runtime-event',
-] as const);
-
-export type AllowedIpcEventChannel = 'learning:runtime-event';
-
 function toUnifiedRequest(channel: string, args: unknown[]): UnifiedRequest {
   const splitIndex = channel.indexOf(':');
   return {
@@ -118,31 +112,6 @@ export async function invokeIpc<T>(channel: string, ...args: unknown[]): Promise
   return invokeApi<T>(channel, ...args);
 }
 
-export function subscribeIpcEvent(
-  channel: AllowedIpcEventChannel,
-  listener: (payload: unknown) => void,
-): () => void {
-  if (!ALLOWED_EVENT_CHANNELS.has(channel)) {
-    throw new AppError('PERMISSION', 'IPC event channel is not allowed', {
-      transport: 'ipc',
-      channel,
-      source: 'renderer-event-subscription',
-    });
-  }
-
-  const unsubscribe = window.electron.ipcRenderer.on(channel, listener);
-  let active = true;
-  return () => {
-    if (!active) return;
-    active = false;
-    if (typeof unsubscribe === 'function') {
-      unsubscribe();
-      return;
-    }
-    window.electron.ipcRenderer.off(channel, listener);
-  };
-}
-
 export async function invokeIpcWithRetry<T>(
   channel: string,
   args: unknown[] = [],