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/index.html

@@ -4,6 +4,10 @@
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Biz Connect</title>
+<meta name="theme-color" content="#1F3B73">
+<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png?v=3">
+<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16.png?v=3">
+<link rel="apple-touch-icon" href="/apple-touch-icon.png?v=3">
 <style>
   :root{ --brand:#FFC708; --brand-d:#E0AC00; --blue:#1F3B73; --blue-d:#16294f; --blue-soft:#EAF0FB; --ink:#1f2430; --muted:#6b7280; --bg:#f6f8fb; --line:#e6e9ef; }
   *{box-sizing:border-box;}