fix: several small fixes

src-tauri/src/player/events.rs

@@ -22,7 +22,14 @@ use super::{MediaSessionType, SleepTimerMode};
 ///
 /// TRACES: UR-005, UR-019, UR-023, UR-026 | DR-001, DR-028, DR-047
 #[derive(Debug, Clone, Serialize, Deserialize, specta::Type, tauri_specta::Event)]
-#[serde(tag = "type", rename_all = "snake_case", rename_all_fields = "camelCase")]
+// NOTE: fields are intentionally snake_case on the wire. specta generates the
+// TypeScript bindings with snake_case field names (it does not apply serde's
+// `rename_all_fields`), so adding `rename_all_fields = "camelCase"` here makes
+// serde emit camelCase payloads that no longer match the generated schema —
+// tauri-specta then silently drops those events (e.g. state_changed,
+// queue_changed never reach the frontend, so the mini player never appears).
+// Keep serde and specta agreeing: snake_case fields, snake_case variant tags.
+#[serde(tag = "type", rename_all = "snake_case")]
 pub enum PlayerStatusEvent {
     /// Playback position updated (emitted periodically during playback)
     PositionUpdate {