feat(web): add button size toggle (S/M/L) in header

Adds a size selector in the header bar that allows users to choose
between Small, Medium, and Large sound buttons. Choice persists
via localStorage. Responsive breakpoints also respect the setting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/App.tsx

@@ -25,6 +25,12 @@ const THEMES = [
 ];
 
 type Tab = 'all' | 'favorites' | 'recent';
+type BtnSize = 'S' | 'M' | 'L';
+const BTN_SIZES: { id: BtnSize; label: string }[] = [
+  { id: 'S', label: 'S' },
+  { id: 'M', label: 'M' },
+  { id: 'L', label: 'L' },
+];
 
 export default function App() {
   /* ── State ── */
@@ -44,6 +50,7 @@ export default function App() {
   const [volume, setVolume] = useState(1);
   const [favs, setFavs] = useState<Record<string, boolean>>({});
   const [theme, setTheme] = useState(() => localStorage.getItem('jb-theme') || 'midnight');
+  const [btnSize, setBtnSize] = useState<BtnSize>(() => (localStorage.getItem('jb-btn-size') as BtnSize) || 'M');
   const [isAdmin, setIsAdmin] = useState(false);
   const [showAdmin, setShowAdmin] = useState(false);
 
@@ -91,6 +98,11 @@ export default function App() {
     localStorage.setItem('jb-theme', theme);
   }, [theme]);
 
+  /* ── Button Size ── */
+  useEffect(() => {
+    localStorage.setItem('jb-btn-size', btnSize);
+  }, [btnSize]);
+
   /* ── SSE ── */
   useEffect(() => {
     const unsub = subscribeEvents((msg) => {
@@ -230,7 +242,7 @@ export default function App() {
 
   /* ── Render ── */
   return (
-    <div className={`app-shell ${chaosMode ? 'party-active' : ''}`}>
+    <div className={`app-shell ${chaosMode ? 'party-active' : ''}`} data-btn-size={btnSize}>
 
       {/* ════════ Header ════════ */}
       <header className="header">
@@ -256,6 +268,18 @@ export default function App() {
             <strong>{total}</strong> Sounds
           </div>
 
+          <div className="size-toggle" title="Button-Größe">
+            {BTN_SIZES.map(s => (
+              <button
+                key={s.id}
+                className={`size-opt ${btnSize === s.id ? 'active' : ''}`}
+                onClick={() => setBtnSize(s.id)}
+              >
+                {s.label}
+              </button>
+            ))}
+          </div>
+
           <select
             className="select-clean"
             value={theme}

web/src/styles.css

@@ -378,6 +378,40 @@ input, select {
   font-weight: 700;
 }
 
+/* ── Size Toggle (S / M / L) ── */
+.size-toggle {
+  display: inline-flex;
+  background: var(--bg-surface-2);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  overflow: hidden;
+  flex-shrink: 0;
+}
+
+.size-opt {
+  padding: 4px 10px;
+  font-size: 11px;
+  font-weight: 700;
+  color: var(--text-muted);
+  transition: all 0.15s;
+  border-right: 1px solid var(--border);
+  line-height: 1;
+}
+
+.size-opt:last-child {
+  border-right: none;
+}
+
+.size-opt:hover {
+  color: var(--text-primary);
+  background: var(--bg-surface-3);
+}
+
+.size-opt.active {
+  color: var(--accent);
+  background: var(--accent-subtle);
+}
+
 /* Theme & Channel selects */
 .select-clean {
   appearance: none;
@@ -677,6 +711,71 @@ input, select {
   background: var(--warning);
 }
 
+/* ── Button Size Variants (S / M / L) ── */
+/* S = default (36px) */
+
+[data-btn-size="M"] .sound-btn {
+  height: 46px;
+  font-size: 13.5px;
+  max-width: 260px;
+  padding: 0 16px 0 0;
+}
+
+[data-btn-size="M"] .sound-btn .sound-label {
+  line-height: 46px;
+  padding: 0 12px;
+}
+
+[data-btn-size="M"] .sound-btn .cat-bar {
+  width: 4px;
+}
+
+[data-btn-size="M"] .sound-btn .fav-star {
+  right: 4px;
+}
+
+[data-btn-size="M"] .sound-btn .fav-star .material-icons {
+  font-size: 16px;
+}
+
+[data-btn-size="M"] .sound-btn .badge-dot {
+  width: 7px;
+  height: 7px;
+  top: 4px;
+  right: 4px;
+}
+
+[data-btn-size="L"] .sound-btn {
+  height: 58px;
+  font-size: 14.5px;
+  max-width: 300px;
+  padding: 0 20px 0 0;
+}
+
+[data-btn-size="L"] .sound-btn .sound-label {
+  line-height: 58px;
+  padding: 0 14px;
+}
+
+[data-btn-size="L"] .sound-btn .cat-bar {
+  width: 5px;
+}
+
+[data-btn-size="L"] .sound-btn .fav-star {
+  right: 6px;
+}
+
+[data-btn-size="L"] .sound-btn .fav-star .material-icons {
+  font-size: 18px;
+}
+
+[data-btn-size="L"] .sound-btn .badge-dot {
+  width: 8px;
+  height: 8px;
+  top: 5px;
+  right: 5px;
+}
+
 /* ────────────────────────────────────────────
    Control Bar (Bottom)
    ──────────────────────────────────────────── */
@@ -1212,6 +1311,24 @@ input, select {
     max-width: 180px;
   }
 
+  [data-btn-size="M"] .sound-btn {
+    height: 40px;
+    font-size: 12.5px;
+    max-width: 220px;
+  }
+  [data-btn-size="M"] .sound-btn .sound-label {
+    line-height: 40px;
+  }
+
+  [data-btn-size="L"] .sound-btn {
+    height: 50px;
+    font-size: 13.5px;
+    max-width: 260px;
+  }
+  [data-btn-size="L"] .sound-btn .sound-label {
+    line-height: 50px;
+  }
+
   .control-bar {
     padding: 0 12px;
     height: auto;