feat: 10-band EQ, connection indicator, new icon (v1.5.0)

### 10-Band Graphic Equalizer
- Full EQ in Rust audio engine via EqSource<S> biquad peak filters
- 10 built-in presets + custom preset save/delete
- EqSource::try_seek() implemented — also fixes waveform seek which broke
  silently when EQ was introduced (rodio returned SeekError::NotSupported)
- EQ state persisted in localStorage, synced to Rust on startup

### Connection Indicator
- LED in header (green/red/pulsing) with server name and LAN/WAN label
- Offline overlay with retry button when server is unreachable
- useConnectionStatus hook

### New App Icon
- New logo (logo-psysonic.png) applied across Login, Sidebar, Settings,
  README and all Tauri platform icons (Windows, macOS, Linux, Android, iOS)

### Now Playing Page
- New /now-playing route added

### Fixes
- WaveformSeek: mousemove/mouseup on window to fix drag outside canvas

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "psysonic",
-  "version": "1.3.0",
+  "version": "1.4.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "psysonic",
-      "version": "1.3.0",
+      "version": "1.4.5",
       "dependencies": {
         "@tauri-apps/api": "^2",
         "@tauri-apps/plugin-dialog": "^2.6.0",
@@ -15,6 +15,7 @@
         "@tauri-apps/plugin-notification": "^2",
         "@tauri-apps/plugin-shell": "^2",
         "@tauri-apps/plugin-store": "^2",
+        "@tauri-apps/plugin-window-state": "^2.4.1",
         "axios": "^1.7.7",
         "butterchurn": "^2.6.7",
         "butterchurn-presets": "^2.4.7",
@@ -1522,6 +1523,15 @@
         "@tauri-apps/api": "^2.8.0"
       }
     },
+    "node_modules/@tauri-apps/plugin-window-state": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/@tauri-apps/plugin-window-state/-/plugin-window-state-2.4.1.tgz",
+      "integrity": "sha512-OuvdrzyY8Q5Dbzpj+GcrnV1iCeoZbcFdzMjanZMMcAEUNy/6PH5pxZPXpaZLOR7whlzXiuzx0L9EKZbH7zpdRw==",
+      "license": "MIT OR Apache-2.0",
+      "dependencies": {
+        "@tauri-apps/api": "^2.8.0"
+      }
+    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",