fix(boss-dashboard): make /m installable as a PWA

manifest-mobile.json had an empty icons array, which blocks Chrome's
install prompt entirely. Point it at the existing android-chrome
192/512 icons and override appleWebApp.title to "Boss" so iOS
Add-to-Home-Screen matches the manifest's short_name instead of
inheriting the root layout's "WFDASH".

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

public/manifest-mobile.json

@@ -8,5 +8,18 @@
   "orientation": "portrait",
   "background_color": "#0b1020",
   "theme_color": "#0b1020",
-  "icons": []
+  "icons": [
+    {
+      "src": "/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    }
+  ]
 }

src/app/(mobile)/m/layout.tsx

@@ -9,6 +9,11 @@ export const metadata: Metadata = {
   icons: {
     apple: "/apple-touch-icon.png",
   },
+  appleWebApp: {
+    capable: true,
+    statusBarStyle: "default",
+    title: "Boss",
+  },
 };
 
 export const viewport: Viewport = {