Add master display UI with audio output management and styling

- Implement main.js for the master display functionality, including WebSocket connection, audio output management, and state handling.
- Create style.css for the master display's visual design, ensuring a cohesive look and feel with a dark theme and responsive layout.
- Integrate device management with a fallback for non-Electron environments, allowing users to select audio outputs.
- Add features for managing favorites, including toggling favorites and filtering by genre.
- Enhance user experience with a responsive favorites grid and drag-to-scroll functionality.

server/db/index.js

@@ -34,6 +34,12 @@ function runMigrations(db) {
     if (!stationCols.has('category')) {
         db.exec('ALTER TABLE stations ADD COLUMN category TEXT');
     }
+    if (!stationCols.has('image_path')) {
+        db.exec('ALTER TABLE stations ADD COLUMN image_path TEXT');
+    }
+    if (!stationCols.has('image_source')) {
+        db.exec('ALTER TABLE stations ADD COLUMN image_source TEXT');
+    }
     const streamCols = new Set(db.prepare("PRAGMA table_info(streams)").all().map((c) => c.name));
     if (!streamCols.has('uuid')) {
         db.exec('ALTER TABLE streams ADD COLUMN uuid TEXT');
@@ -55,5 +61,15 @@ function runMigrations(db) {
     db.exec('CREATE UNIQUE INDEX IF NOT EXISTS idx_stations_uuid ON stations(uuid)');
     db.exec('CREATE UNIQUE INDEX IF NOT EXISTS idx_streams_uuid  ON streams(uuid)');
     db.exec('CREATE INDEX        IF NOT EXISTS idx_stations_category ON stations(category)');
+
+    // station_plays gained session/listen-time aggregates so the leaderboard
+    // can rank by actual playtime, not just play-button taps.
+    const playCols = new Set(db.prepare("PRAGMA table_info(station_plays)").all().map((c) => c.name));
+    if (!playCols.has('sessions')) {
+        db.exec('ALTER TABLE station_plays ADD COLUMN sessions INTEGER NOT NULL DEFAULT 0');
+    }
+    if (!playCols.has('total_play_ms')) {
+        db.exec('ALTER TABLE station_plays ADD COLUMN total_play_ms INTEGER NOT NULL DEFAULT 0');
+    }
 }