feat: rename app to SatsAmp + appearance themes (violet/blue/green/orange accents, System/Dark/Light modes)

- project dir ~/Projects/RadAmp -> ~/Projects/SatsAmp; classes, strings, launcher label, UA strings renamed; applicationId + radamp.db kept so existing installs/data survive
- UiPrefs (SharedPreferences) + UiTokens: 4 accents x dark/light, every text/accent pair AA-verified (accentOnFill picks ink vs white per accent)
- legacy Premium* colors rewritten to LocalTokens.current reads; theme switches live, persists across restart
- Appearance dialog in Library top bar (swatches + System/Dark/Light), verified on-device: orange live-switch, light mode + persistence, folder-tab regression pass

design/glass-radio-demo.html

@@ -3,10 +3,10 @@
 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
-<title>RadAmp Glass — Theme Demo</title>
+<title>SatsAmp Glass — Theme Demo</title>
 <style>
 /* ============================================================
-   RadAmp Glass — glassmorphism theme for audio/radio streaming
+   SatsAmp Glass — glassmorphism theme for audio/radio streaming
    Dark default + light variant. WCAG 2.2 AA verified (see demo).
    ============================================================ */
 
@@ -514,7 +514,7 @@ input[type="range"].vol::-moz-range-progress { background: var(--accent); height
 
 <div class="demo-wrap">
   <!-- ================= PHONE ================= -->
-  <div class="phone glass-app" role="application" aria-label="RadAmp demo device">
+  <div class="phone glass-app" role="application" aria-label="SatsAmp demo device">
 
     <div class="status-bar" aria-hidden="true">
       <span>16:29</span>
@@ -637,7 +637,7 @@ input[type="range"].vol::-moz-range-progress { background: var(--accent); height
 
   <!-- ================= SIDE PANEL ================= -->
   <aside class="demo-side">
-    <h1>RadAmp Glass</h1>
+    <h1>SatsAmp Glass</h1>
     <p class="caption">GLASSMORPHISM THEME · AUDIO / RADIO · WCAG 2.2 AA</p>
 
     <div class="controls" role="group" aria-label="Demo controls">