feat: remove Learning module

electron/main/background-lifecycle.ts

@@ -1,6 +1,6 @@
 import { EventEmitter } from 'node:events';
 
-export type DesktopModule = 'programming' | 'painting' | 'learning' | 'robot' | 'other';
+export type DesktopModule = 'programming' | 'painting' | 'robot' | 'other';
 
 export type DesktopActivity = {
   visible: boolean;

electron/main/index.ts

@@ -663,7 +663,7 @@ async function initialize(): Promise<void> {
   });
 
   // Coding workers are started on demand. Keeping them cold for
-  // Canvas/Learning/Robot avoids a resident child process on every launch.
+  // Canvas/Robot avoids a resident child process on every launch.
   void initializeBackgroundServices().catch((error) => {
     logger.warn('Deferred background initialization failed:', error);
   });