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>

src/i18n.ts

@@ -13,6 +13,7 @@ const enTranslation = {
     playlists: 'Playlists',
     randomMix: 'Random Mix',
     favorites: 'Favorites',
+    nowPlaying: 'Now Playing',
     system: 'System',
     statistics: 'Statistics',
     settings: 'Settings',
@@ -54,6 +55,7 @@ const enTranslation = {
     loading: 'Loading…',
     nobody: 'Nobody is currently listening.',
     minutesAgo: '{{n}}m ago',
+    nothingPlaying: 'Nothing playing yet. Start a track!',
   },
   contextMenu: {
     playNow: 'Play Now',
@@ -214,6 +216,15 @@ const enTranslation = {
     savedServers: 'Saved Servers',
     addNew: 'Or add a new server',
   },
+  connection: {
+    connected: 'Connected',
+    disconnected: 'Disconnected',
+    checking: 'Connecting…',
+    extern: 'Extern',
+    offlineTitle: 'No server connection',
+    offlineSubtitle: 'Cannot reach {{server}}. Check your network or server.',
+    retry: 'Retry',
+  },
   common: {
     albums: 'Albums',
     album: 'Album',
@@ -257,6 +268,16 @@ const enTranslation = {
     testingBtn: 'Testing…',
     connected: 'Connected',
     failed: 'Failed',
+    eqTitle: 'Equalizer',
+    eqEnabled: 'Enable Equalizer',
+    eqPreset: 'Preset',
+    eqPresetCustom: 'Custom',
+    eqPresetBuiltin: 'Built-in Presets',
+    eqPresetCustomGroup: 'My Presets',
+    eqSavePreset: 'Save as Preset',
+    eqPresetName: 'Preset name…',
+    eqDeletePreset: 'Delete preset',
+    eqResetBands: 'Reset to Flat',
     lfmTitle: 'Last.fm Scrobbling',
     lfmDesc1: 'Psysonic supports server-side scrobbling directly via Navidrome. To link Last.fm, please log in once via the',
     lfmDesc1NavidromeWebplayer: 'Navidrome Webplayer',
@@ -278,7 +299,7 @@ const enTranslation = {
     aboutDesc: 'A desktop music player for Subsonic-compatible servers (Navidrome, Gonic, and others). Streams your self-hosted music library with a clean, modern interface styled after the Catppuccin colour palette.',
     aboutFeatures: 'Multi-server support · Scrobbling · Fullscreen player · Album downloads · Image caching · Catppuccin themes',
     aboutLicense: 'License',
-    aboutLicenseText: 'MIT — free to use, modify, and distribute.',
+    aboutLicenseText: 'GNU GPL v3 — free to use, modify, and distribute under the same license.',
     aboutRepo: 'Source Code on GitHub',
     aboutVersion: 'Version',
     aboutBuiltWith: 'Built with Tauri · React · TypeScript · Rust/rodio',
@@ -433,6 +454,7 @@ const deTranslation = {
     playlists: 'Playlists',
     randomMix: 'Zufallsmix',
     favorites: 'Favoriten',
+    nowPlaying: 'Now Playing',
     system: 'System',
     statistics: 'Statistiken',
     settings: 'Einstellungen',
@@ -474,6 +496,7 @@ const deTranslation = {
     loading: 'Lädt…',
     nobody: 'Gerade hört niemand Musik.',
     minutesAgo: 'vor {{n}}m',
+    nothingPlaying: 'Noch nichts am Laufen. Leg einen Track auf!',
   },
   contextMenu: {
     playNow: 'Direkt abspielen',
@@ -634,6 +657,15 @@ const deTranslation = {
     savedServers: 'Gespeicherte Server',
     addNew: 'Oder neuen Server hinzufügen',
   },
+  connection: {
+    connected: 'Verbunden',
+    disconnected: 'Getrennt',
+    checking: 'Verbinde…',
+    extern: 'Extern',
+    offlineTitle: 'Keine Serververbindung',
+    offlineSubtitle: '{{server}} ist nicht erreichbar. Prüfe Netzwerk oder Server.',
+    retry: 'Erneut versuchen',
+  },
   common: {
     albums: 'Alben',
     album: 'Album',
@@ -677,6 +709,16 @@ const deTranslation = {
     testingBtn: 'Teste…',
     connected: 'Verbunden',
     failed: 'Fehlgeschlagen',
+    eqTitle: 'Equalizer',
+    eqEnabled: 'Equalizer aktivieren',
+    eqPreset: 'Preset',
+    eqPresetCustom: 'Benutzerdefiniert',
+    eqPresetBuiltin: 'Eingebaute Presets',
+    eqPresetCustomGroup: 'Meine Presets',
+    eqSavePreset: 'Als Preset speichern',
+    eqPresetName: 'Preset-Name…',
+    eqDeletePreset: 'Preset löschen',
+    eqResetBands: 'Auf Flat zurücksetzen',
     lfmTitle: 'Last.fm Scrobbling',
     lfmDesc1: 'Psysonic unterstützt serverseitiges Scrobbling direkt über Navidrome. Um Last.fm zu verknüpfen, logge dich bitte einmalig über den',
     lfmDesc1NavidromeWebplayer: 'Navidrome Webplayer',
@@ -698,7 +740,7 @@ const deTranslation = {
     aboutDesc: 'Ein Desktop-Musikplayer für Subsonic-kompatible Server (Navidrome, Gonic u. a.). Streame deine selbst gehostete Musikbibliothek mit einer modernen Oberfläche im Catppuccin-Design.',
     aboutFeatures: 'Multi-Server · Scrobbling · Vollbild-Player · Album-Downloads · Bild-Cache · Catppuccin-Themes',
     aboutLicense: 'Lizenz',
-    aboutLicenseText: 'MIT — kostenlos nutzbar, veränderbar und weiterzugeben.',
+    aboutLicenseText: 'GNU GPL v3 — kostenlos nutzbar, veränderbar und unter gleicher Lizenz weiterzugeben.',
     aboutRepo: 'Quellcode auf GitHub',
     aboutVersion: 'Version',
     aboutBuiltWith: 'Gebaut mit Tauri · React · TypeScript · Rust/rodio',