feat(titlebar): custom Linux title bar with now-playing display

- set_decorations(false) on Linux at startup via #[cfg(target_os = "linux")]
- New TitleBar component: drag region + minimize/maximize/close buttons
- Currently playing track (▶/⏸ + artist – title) shown in the center
- app-shell grid gains a 32px titlebar row when data-titlebar is set
- IS_LINUX utility constant via navigator.platform
- macOS and Windows are completely unaffected

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

src-tauri/src/lib.rs

@@ -826,6 +826,17 @@ pub fn run() {
         }))
 
         .setup(|app| {
+            // ── Custom title bar on Linux ─────────────────────────────────
+            // Remove OS window decorations so the React TitleBar component
+            // takes over. macOS and Windows keep their native decorations.
+            #[cfg(target_os = "linux")]
+            {
+                use tauri::Manager;
+                if let Some(win) = app.get_webview_window("main") {
+                    let _ = win.set_decorations(false);
+                }
+            }
+
             // ── System tray ───────────────────────────────────────────────
             // Always build on startup; the frontend calls toggle_tray_icon(false)
             // immediately after load if the user has disabled the tray icon.

src/App.tsx

@@ -51,6 +51,8 @@ import GenreDetail from './pages/GenreDetail';
 import ExportPickerModal from './components/ExportPickerModal';
 import ChangelogModal from './components/ChangelogModal';
 import AppUpdater from './components/AppUpdater';
+import TitleBar from './components/TitleBar';
+import { IS_LINUX } from './utils/platform';
 import { version } from '../package.json';
 import { useConnectionStatus } from './hooks/useConnectionStatus';
 import { useAuthStore } from './store/authStore';
@@ -252,12 +254,14 @@ function AppShell() {
       className="app-shell"
       data-mobile={isMobile || undefined}
       data-mobile-player={isMobilePlayer || undefined}
+      data-titlebar={IS_LINUX || undefined}
       style={{
         '--sidebar-width': isMobile ? '0px' : (isSidebarCollapsed ? '72px' : 'clamp(200px, 15vw, 220px)'),
         '--queue-width': isMobile ? '0px' : (isQueueVisible ? `${queueWidth}px` : '0px')
       } as React.CSSProperties}
       onContextMenu={e => e.preventDefault()}
     >
+      {IS_LINUX && <TitleBar />}
       {!isMobile && (
         <Sidebar
           isCollapsed={isSidebarCollapsed}

src/components/TitleBar.tsx

@@ -0,0 +1,55 @@
+import React from 'react';
+import { getCurrentWindow } from '@tauri-apps/api/window';
+import { X, Minus, Square } from 'lucide-react';
+import { usePlayerStore } from '../store/playerStore';
+
+const win = getCurrentWindow();
+
+export default function TitleBar() {
+  const currentTrack = usePlayerStore(s => s.currentTrack);
+  const isPlaying = usePlayerStore(s => s.isPlaying);
+
+  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 && (
+          <>
+            <span className="titlebar-track-state">{isPlaying ? '▶' : '⏸'}</span>
+            <span className="titlebar-track-text truncate">
+              {currentTrack.artist && `${currentTrack.artist} – `}{currentTrack.title}
+            </span>
+          </>
+        )}
+      </div>
+
+      <div className="titlebar-controls">
+        <button
+          className="titlebar-btn titlebar-btn-minimize"
+          onClick={() => win.minimize()}
+          data-tooltip="Minimize"
+          data-tooltip-pos="bottom"
+        >
+          <Minus size={10} />
+        </button>
+        <button
+          className="titlebar-btn titlebar-btn-maximize"
+          onClick={() => win.toggleMaximize()}
+          data-tooltip="Maximize"
+          data-tooltip-pos="bottom"
+        >
+          <Square size={9} />
+        </button>
+        <button
+          className="titlebar-btn titlebar-btn-close"
+          onClick={() => win.close()}
+          data-tooltip="Close"
+          data-tooltip-pos="bottom"
+        >
+          <X size={12} />
+        </button>
+      </div>
+    </div>
+  );
+}

src/styles/layout.css

@@ -27,6 +27,98 @@
   background: var(--bg-app);
 }
 
+/* ─── Custom title bar (Linux only — decorations: false) ─── */
+:root {
+  --titlebar-height: 32px;
+}
+
+.app-shell[data-titlebar] {
+  grid-template-rows: var(--titlebar-height) 1fr var(--player-height);
+  grid-template-areas:
+    "titlebar titlebar titlebar"
+    "sidebar  main     queue"
+    "player   player   player";
+}
+
+.titlebar {
+  grid-area: titlebar;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  background: var(--bg-sidebar);
+  border-bottom: 1px solid var(--border-subtle);
+  padding: 0 6px 0 12px;
+  height: var(--titlebar-height);
+  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%;
+  transform: translateX(-50%);
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  max-width: 40%;
+  pointer-events: none;
+}
+
+.titlebar-track-state {
+  font-size: 9px;
+  color: var(--accent);
+  flex-shrink: 0;
+}
+
+.titlebar-track-text {
+  font-size: 12px;
+  color: var(--text-secondary);
+  max-width: 100%;
+}
+
+.titlebar-controls {
+  display: flex;
+  gap: 2px;
+  flex: 0 0 auto;
+}
+
+.titlebar-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 30px;
+  height: 24px;
+  border: none;
+  background: transparent;
+  color: var(--text-muted);
+  border-radius: var(--radius-sm);
+  cursor: pointer;
+  transition: background var(--transition-fast), color var(--transition-fast);
+}
+
+.titlebar-btn:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.titlebar-btn-close:hover {
+  background: var(--danger);
+  color: #fff;
+}
+
+/* Resizer handles must start below the titlebar */
+.app-shell[data-titlebar] .resizer {
+  top: var(--titlebar-height);
+}
+
 /* ─── Resizer Handles ─── */
 .resizer {
   position: absolute;

src/utils/platform.ts

@@ -0,0 +1,2 @@
+/** True when running on Linux (WebKitGTK). Used to show the custom title bar. */
+export const IS_LINUX = navigator.platform.toLowerCase().includes('linux');