feat: add Studio NLE playback controls

packages/studio/src/player/store/playerStore.test.ts

@@ -16,6 +16,7 @@ describe("usePlayerStore", () => {
       expect(state.elements).toEqual([]);
       expect(state.selectedElementId).toBeNull();
       expect(state.playbackRate).toBe(1);
+      expect(state.loopEnabled).toBe(false);
       expect(state.zoomMode).toBe("fit");
       expect(state.manualZoomPercent).toBe(100);
     });
@@ -61,6 +62,13 @@ describe("usePlayerStore", () => {
     });
   });
 
+  describe("setLoopEnabled", () => {
+    it("updates loopEnabled", () => {
+      usePlayerStore.getState().setLoopEnabled(true);
+      expect(usePlayerStore.getState().loopEnabled).toBe(true);
+    });
+  });
+
   describe("setTimelineReady", () => {
     it("updates timelineReady", () => {
       usePlayerStore.getState().setTimelineReady(true);
@@ -205,9 +213,10 @@ describe("usePlayerStore", () => {
       expect(state.selectedElementId).toBeNull();
     });
 
-    it("does not reset playbackRate, zoomMode, or manualZoomPercent", () => {
+    it("does not reset playbackRate, loopEnabled, zoomMode, or manualZoomPercent", () => {
       const store = usePlayerStore.getState();
       store.setPlaybackRate(2);
+      store.setLoopEnabled(true);
       store.setZoomMode("manual");
       store.setManualZoomPercent(200);
 
@@ -216,6 +225,7 @@ describe("usePlayerStore", () => {
       const state = usePlayerStore.getState();
       // reset() only resets the fields explicitly listed in the reset function
       expect(state.playbackRate).toBe(2);
+      expect(state.loopEnabled).toBe(true);
       expect(state.zoomMode).toBe("manual");
       expect(state.manualZoomPercent).toBe(200);
     });

packages/studio/src/player/store/playerStore.ts

@@ -34,6 +34,7 @@ interface PlayerState {
   elements: TimelineElement[];
   selectedElementId: string | null;
   playbackRate: number;
+  loopEnabled: boolean;
   /** Timeline zoom: 'fit' auto-scales to viewport, 'manual' uses manualZoomPercent */
   zoomMode: ZoomMode;
   /** Timeline zoom percent relative to the fit width when in manual mode */
@@ -43,6 +44,7 @@ interface PlayerState {
   setCurrentTime: (time: number) => void;
   setDuration: (duration: number) => void;
   setPlaybackRate: (rate: number) => void;
+  setLoopEnabled: (enabled: boolean) => void;
   setTimelineReady: (ready: boolean) => void;
   setElements: (elements: TimelineElement[]) => void;
   setSelectedElementId: (id: string | null) => void;
@@ -76,11 +78,13 @@ export const usePlayerStore = create<PlayerState>((set) => ({
   elements: [],
   selectedElementId: null,
   playbackRate: 1,
+  loopEnabled: false,
   zoomMode: "fit",
   manualZoomPercent: 100,
 
   setIsPlaying: (playing) => set({ isPlaying: playing }),
   setPlaybackRate: (rate) => set({ playbackRate: rate }),
+  setLoopEnabled: (enabled) => set({ loopEnabled: enabled }),
   setZoomMode: (mode) => set({ zoomMode: mode }),
   setManualZoomPercent: (percent) =>
     set({ manualZoomPercent: Math.max(10, Math.min(2000, Math.round(percent))) }),
@@ -96,7 +100,7 @@ export const usePlayerStore = create<PlayerState>((set) => ({
       ),
     })),
   // Resets project-specific state when switching compositions.
-  // playbackRate, zoomMode, and manualZoomPercent are intentionally preserved
+  // playbackRate, loopEnabled, zoomMode, and manualZoomPercent are intentionally preserved
   // because they are user preferences that should survive project switches.
   reset: () =>
     set({