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-orbit-dark.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="64" height="64" role="img" aria-label="Loading">
+  <circle cx="50" cy="50" r="34" fill="none" stroke="#ffffff" stroke-width="9" stroke-linecap="round" stroke-dasharray="165 300" transform="rotate(38 50 50)"/>
+  <g><circle cx="84" cy="50" r="7" fill="#FFC708"/>
+    <animateTransform attributeName="transform" type="rotate" from="0 50 50" to="360 50 50" dur="1.1s" repeatCount="indefinite"/></g>
+</svg>