Add support for fusing/unfusing JellyLMS zones into synchronized

multi-room groups, addressed by MAC (derived from the `lms-{mac}` device id).

src/lib/api/bindings.ts

@@ -270,6 +270,31 @@ async remoteSessionSetVolume(sessionId: string, volume: number) : Promise<null>
 async remoteSessionToggleMute(sessionId: string) : Promise<null> {
     return await TAURI_INVOKE("remote_session_toggle_mute", { sessionId });
 },
+/**
+ * List current LMS sync groups.
+ */
+async lmsGetSyncGroups() : Promise<LmsSyncGroup[]> {
+    return await TAURI_INVOKE("lms_get_sync_groups");
+},
+/**
+ * Fuse LMS zones into a sync group. `master_mac` keeps playing and the
+ * `slave_macs` zones join it in sync.
+ */
+async lmsCreateSyncGroup(masterMac: string, slaveMacs: string[]) : Promise<null> {
+    return await TAURI_INVOKE("lms_create_sync_group", { masterMac, slaveMacs });
+},
+/**
+ * Remove a single LMS zone from its sync group (decouple one player).
+ */
+async lmsUnsyncPlayer(mac: string) : Promise<null> {
+    return await TAURI_INVOKE("lms_unsync_player", { mac });
+},
+/**
+ * Dissolve an entire LMS sync group, identified by its master's MAC.
+ */
+async lmsDissolveSyncGroup(masterMac: string) : Promise<null> {
+    return await TAURI_INVOKE("lms_dissolve_sync_group", { masterMac });
+},
 /**
  * Set polling frequency hint based on UI state
  */
@@ -322,6 +347,17 @@ async playbackModeGetRemoteStatus() : Promise<RemoteSessionStatus> {
 async playbackModeTransferToLocal(currentItemId: string, positionTicks: number) : Promise<null> {
     return await TAURI_INVOKE("playback_mode_transfer_to_local", { currentItemId, positionTicks });
 },
+/**
+ * Set the transferring flag on the playback mode manager.
+ * 
+ * Used by the frontend remote->local flow to mark the whole two-step sequence
+ * as a transfer, so `player_play_tracks` starts LOCAL playback instead of
+ * casting back to the remote session it's leaving. Always pair `true` with a
+ * later `false` (including on error) so the flag can't stick.
+ */
+async playbackModeSetTransferring(transferring: boolean) : Promise<null> {
+    return await TAURI_INVOKE("playback_mode_set_transferring", { transferring });
+},
 /**
  * Initialize playback reporter (called after login)
  */
@@ -1503,6 +1539,13 @@ export type ImageType = "Primary" | "Backdrop" | "Banner" | "Thumb" | "Logo"
  * Library (media collection)
  */
 export type Library = { id: string; name: string; collectionType: string; imageTag?: string | null }
+/**
+ * An LMS multi-room sync group, as returned by JellyLMS `/JellyLms/SyncGroups`.
+ * 
+ * Mirrors the plugin's `SyncGroup` model. The master is the sync source; slaves
+ * follow it in lockstep.
+ */
+export type LmsSyncGroup = { masterMac: string; masterName?: string; slaveMacs?: string[]; slaveNames?: string[] }
 /**
  * Media item
  */