feat: lens effects tab, standalone motion effects, clip/asset rename, preview popout

- New Lens category in the assets panel: Blur, Motion Blur, Zoom In/Out,
  Pan x4, Shake, Pulse, Spin, Custom Zoom. EffectDefinition gains a
  category field; tabs with an empty category are hidden, and the
  properties-panel 'Open effects' button opens the first non-empty one.
- Motion effects work standalone: dropping them on the timeline creates
  an effect-track element that animates (scale/translate/rotate) every
  track below it, computed purely in the TS frame descriptor - no wasm
  changes, identical in preview and export. supportsStandalone removed.
- Motion Blur: directional gaussian smear (amount + angle) reusing the
  existing WGSL shader with arbitrary u_direction.
- Custom Zoom: start/end scale params (keyframable clip-level).
- MotionOffset gains optional rotate, accumulated clip-level and applied
  to standalone layer quads via rotationDegrees.
- Rename clips (timeline context menu) and media assets (media panel
  context menu) via a shared RenameDialog; asset rename persists through
  storageService with rollback on error.
- Preview pops out into a Document Picture-in-Picture window and docks
  back; button hidden where the API is unsupported.
- Export keeps running when the export popover is closed; only the
  explicit Cancel button aborts.
- Captions and Adjustment tabs removed from the assets panel.

1 files changed, 3 insertions, 1 deletions

diff --git a/apps/web/src/effects/motion.ts b/apps/web/src/effects/motion.ts
index ab51002a..8734d343 100644
--- a/apps/web/src/effects/motion.ts
+++ b/apps/web/src/effects/motion.ts
@@ -94,6 +94,7 @@ export function applyMotionEffects({
 	let scale = 1;
 	let translateX = 0;
 	let translateY = 0;
+	let rotate = 0;
 
 	for (const effect of motionEffects) {
 		const definition = effectsRegistry.get(effect.type);
@@ -117,6 +118,7 @@ export function applyMotionEffects({
 		scale *= offset.scale;
 		translateX += offset.translateX;
 		translateY += offset.translateY;
+		rotate += offset.rotate ?? 0;
 	}
 
 	return {
@@ -126,6 +128,6 @@ export function applyMotionEffects({
 			x: baseTransform.position.x + translateX * canvasWidth,
 			y: baseTransform.position.y + translateY * canvasHeight,
 		},
-		rotate: baseTransform.rotate,
+		rotate: baseTransform.rotate + rotate,
 	};
 }