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/preload.ts

@@ -17,9 +17,6 @@ export interface ElectronAPI {
     startStream: (rtspUrl: string) => Promise<boolean>;
     stopStream: () => Promise<boolean>;
   };
-  motion: {
-    onDetected: (callback: () => void) => () => void;
-  };
   app: {
     quit: () => void;
     toggleFullscreen: () => void;
@@ -61,13 +58,6 @@ const electronAPI: ElectronAPI = {
     startStream: (rtspUrl: string) => ipcRenderer.invoke('frigate:startStream', rtspUrl),
     stopStream: () => ipcRenderer.invoke('frigate:stopStream'),
   },
-  motion: {
-    onDetected: (callback: () => void) => {
-      const handler = (_event: IpcRendererEvent) => callback();
-      ipcRenderer.on('motion:detected', handler);
-      return () => ipcRenderer.removeListener('motion:detected', handler);
-    },
-  },
   app: {
     quit: () => ipcRenderer.invoke('app:quit'),
     toggleFullscreen: () => ipcRenderer.invoke('app:toggleFullscreen'),