style(titlebar): theme-independent traffic-lights + song pill

Window controls use fixed macOS-style colored dots (red/yellow/green)
so they stay visible on every theme (broke on Middle-Earth etc. where
text tokens collapsed against the sidebar bg). Song indicator becomes
a dark translucent pill with light text + text-shadow for universal
contrast. Removed the "Psysonic" label — the sidebar logo already
covers it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/TitleBar.tsx

@@ -10,8 +10,6 @@ export default function TitleBar() {
 
   return (
     <div className="titlebar" data-tauri-drag-region>
-      <span className="titlebar-title" data-tauri-drag-region>Psysonic</span>
-
       <div className="titlebar-track" data-tauri-drag-region>
         {currentTrack && (
           <>

src/styles/layout.css

@@ -67,7 +67,7 @@
   grid-area: titlebar;
   display: flex;
   align-items: center;
-  justify-content: space-between;
+  justify-content: flex-end;
   background: var(--bg-sidebar);
   border-bottom: 1px solid var(--border-subtle);
   padding: 0 6px 0 12px;
@@ -75,15 +75,6 @@
   user-select: none;
 }
 
-.titlebar-title {
-  font-size: 12px;
-  font-weight: 600;
-  color: var(--text-muted);
-  letter-spacing: 0.02em;
-  pointer-events: none;
-  flex: 0 0 auto;
-}
-
 .titlebar-track {
   position: absolute;
   left: 50%;
@@ -93,23 +84,35 @@
   gap: 6px;
   max-width: 40%;
   pointer-events: none;
+  padding: 3px 10px;
+  background: rgba(0, 0, 0, 0.45);
+  border-radius: 999px;
+  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
+}
+
+.titlebar-track:empty {
+  display: none;
 }
 
 .titlebar-track-state {
   font-size: 9px;
   color: var(--accent);
   flex-shrink: 0;
+  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.6);
 }
 
 .titlebar-track-text {
-  font-size: 12px;
-  color: var(--text-secondary);
+  font-size: 11px;
+  color: #ececec;
   max-width: 100%;
+  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.5);
 }
 
 .titlebar-controls {
   display: flex;
-  gap: 2px;
+  align-items: center;
+  gap: 8px;
+  padding: 0 8px;
   flex: 0 0 auto;
 }
 
@@ -117,24 +120,43 @@
   display: flex;
   align-items: center;
   justify-content: center;
-  width: 30px;
-  height: 24px;
+  width: 14px;
+  height: 14px;
+  padding: 0;
   border: none;
-  background: transparent;
-  color: var(--text-muted);
-  border-radius: var(--radius-sm);
+  border-radius: 50%;
   cursor: pointer;
-  transition: background var(--transition-fast), color var(--transition-fast);
+  box-shadow: inset 0 0 0 0.5px rgba(0, 0, 0, 0.18);
+  transition: filter var(--transition-fast);
+}
+
+.titlebar-btn svg {
+  width: 9px;
+  height: 9px;
+  stroke-width: 2.5;
+}
+
+.titlebar-btn-close {
+  background: #ff5f57;
+  color: #4d0000;
+}
+
+.titlebar-btn-minimize {
+  background: #febc2e;
+  color: #7a4a00;
+}
+
+.titlebar-btn-maximize {
+  background: #28c840;
+  color: #004d00;
 }
 
 .titlebar-btn:hover {
-  background: var(--bg-hover);
-  color: var(--text-primary);
+  filter: brightness(1.08);
 }
 
-.titlebar-btn-close:hover {
-  background: var(--danger);
-  color: #fff;
+.titlebar-btn:active {
+  filter: brightness(0.92);
 }
 
 /* Resizer handles must start below the titlebar */