Serve PWA icons from fresh /icons/v2/ URLs with every iOS size

iOS showed a letter tile ('N') when adding to the Home Screen. The live files were fine, but a
reverse proxy in front of the app serves static files with a long cache lifetime (live icon.svg
and sw.js were stale) and iOS remembers a failed icon per URL.

- New versioned URLs no proxy/phone has cached; old paths kept for existing installs
- apple-touch-icon declared at 180/167/152/120 (opaque 8-bit RGB PNGs) for app and dashboard
- 180px icon also listed in both manifests; notification icons and root fallbacks use v2
- Service worker cache bumped

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/public/icons/v2/icon.svg

@@ -0,0 +1,22 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#3b82f6"/><stop offset="1" stop-color="#0a1a40"/></linearGradient>
+    <radialGradient id="glow" cx="0.18" cy="0.1" r="0.7"><stop offset="0" stop-color="#fff" stop-opacity="0.28"/><stop offset="1" stop-color="#fff" stop-opacity="0"/></radialGradient>
+    <radialGradient id="sun" cx="0.4" cy="0.4" r="0.7"><stop offset="0" stop-color="#ffe9a8"/><stop offset="1" stop-color="#f97316"/></radialGradient>
+    <radialGradient id="sunglow"><stop offset="0" stop-color="#fbbf24" stop-opacity="0.5"/><stop offset="1" stop-color="#fbbf24" stop-opacity="0"/></radialGradient>
+    <linearGradient id="cloud" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#ffffff"/><stop offset="1" stop-color="#c9dcf5"/></linearGradient>
+    <filter id="soft" x="-20%" y="-20%" width="140%" height="160%"><feGaussianBlur stdDeviation="22"/></filter>
+  </defs>
+  <rect width="1024" height="1024" fill="url(#bg)"/>
+  <rect width="1024" height="1024" fill="url(#glow)"/>
+  <circle cx="400" cy="430" r="230" fill="url(#sunglow)"/>
+  <circle cx="400" cy="430" r="132" fill="url(#sun)"/>
+  <g filter="url(#soft)" opacity="0.35" transform="translate(0 26)" fill="#06122e">
+    <circle cx="392" cy="572" r="96"/><circle cx="522" cy="522" r="126"/><circle cx="648" cy="582" r="86"/>
+    <rect x="300" y="560" width="432" height="132" rx="66"/>
+  </g>
+  <g fill="url(#cloud)">
+    <circle cx="392" cy="572" r="96"/><circle cx="522" cy="522" r="126"/><circle cx="648" cy="582" r="86"/>
+    <rect x="300" y="560" width="432" height="132" rx="66"/>
+  </g>
+</svg>