Simplify home view and drop motion detection

- Top nav tabs (Home/Media/Cameras/Settings) replace the right-side button cluster
- Home view now shows calendar 90% / todo 10% vertically; lights, locks,
  alarm, thermostats removed from the dashboard since the photo frame now
  owns the idle space and the nav covers the remaining sections
- Motion detection deleted: the go2rtc-based Kitchen_Panel poll was only
  there to wake the screen before idle timeout, which photo-frame exit on
  touch replaces

electron/main.ts

@@ -4,14 +4,12 @@ import * as fs from 'fs';
 import { ScreenManager } from './services/ScreenManager';
 import { PresenceDetector } from './services/PresenceDetector';
 import { FrigateStreamer } from './services/FrigateStreamer';
-import { MotionDetector } from './services/MotionDetector';
 import { PhotoManager } from './services/PhotoManager';
 
 let mainWindow: BrowserWindow | null = null;
 let screenManager: ScreenManager | null = null;
 let presenceDetector: PresenceDetector | null = null;
 let frigateStreamer: FrigateStreamer | null = null;
-let motionDetector: MotionDetector | null = null;
 let photoManager: PhotoManager | null = null;
 let powerSaveBlockerId: number | null = null;
 
@@ -63,23 +61,6 @@ function createWindow(): void {
   // Initialize services
   screenManager = new ScreenManager(mainWindow);
 
-  // Initialize motion detector (runs in main process, not throttled by browser)
-  // Uses file size comparison which is more reliable for JPEG streams
-  motionDetector = new MotionDetector({
-    go2rtcUrl: 'http://192.168.1.241:1985',
-    cameraName: 'Kitchen_Panel',
-    sensitivityThreshold: 5, // % file size change to trigger (5% = significant motion)
-    checkIntervalMs: 2000, // Check every 2 seconds for responsiveness
-  });
-
-  motionDetector.on('motion', () => {
-    console.log('MotionDetector: Motion detected, waking screen');
-    screenManager?.wakeScreen();
-    mainWindow?.webContents.send('motion:detected');
-  });
-
-  motionDetector.start();
-
   // Photo frame slideshow source
   photoManager = new PhotoManager(resolvePhotosDir());
   console.log(`PhotoManager: watching ${photoManager.getDir()}`);
@@ -243,7 +224,6 @@ app.on('window-all-closed', () => {
   }
   presenceDetector?.stop();
   frigateStreamer?.stop();
-  motionDetector?.stop();
 
   if (process.platform !== 'darwin') {
     app.quit();