feat(brand): roll out master app icon, splash & branded loaders everywhere

From brand-assets/ masters (C + orbiting-dot on brand blue):
- Regenerated PWA icons (192/512/maskable), apple-touch (180), favicons
  (32/16 + root favicon.ico) from the 1024 master; bumped manifest to v3.
- Rebuilt desktop/build/icon.ico as a proper multi-size ICO (16..256,
  PNG-compressed) to fix the tiny/blurry taskbar icon.
- Updated mobile masters (resources/icon.png 1024, splash.png/splash-dark.png
  2732) for capacitor-assets to regenerate native icons/splash.
- Wired the animated branded orbit loader into the app boot 'Loading…' screen;
  added favicon/theme-color links to index + home heads.
- logo.png (horizontal wordmark) left untouched — masters have no wordmark.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/public/loader-ring.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50" width="50" height="50" role="img" aria-label="Loading">
+  <circle cx="25" cy="25" r="20" fill="none" stroke="#1F3B73" stroke-opacity="0.16" stroke-width="5"/>
+  <path fill="none" stroke="#FFC708" stroke-width="5" stroke-linecap="round" d="M25 5 A20 20 0 0 1 45 25">
+    <animateTransform attributeName="transform" type="rotate" from="0 25 25" to="360 25 25" dur="0.8s" repeatCount="indefinite"/>
+  </path>
+</svg>