feat: Clip effects, asset sorting, and timeline improvements

Major features and improvements:

* **Clip Effects**:
  * Added UI in Properties Panel to manage effects on video/image clips (add, remove, toggle, reorder).
  * Implemented dynamic parameter fields for effects.
  * Added support for keyframing effect parameters.

* **Assets Panel**:
  * Added sorting options: Name, Type, Duration, and File Size.
  * Persisted view preferences (grid/list mode, sort order) to local storage.
  * Refactored media item rendering and drag interactions.

* **Timeline & Interaction**:
  * **Keyframe Dragging**: Added ability to drag keyframes directly on the timeline element.
  * **Resizing**: Improved resize logic to respect neighboring clips (prevents overlaps).
  * **Visuals**: Implemented tiled background rendering for video/image clips on the timeline.
  * **Shortcuts**: Added "Deselect All" action bound to the `Escape` key.
  * **Fixes**: Corrected drag-and-drop coordinate calculations when the timeline track area is scrolled.

* **Text Elements**:
  * Refactored text background storage to use an explicit `enabled` flag.
  * Added `V8toV9` storage migration to update existing projects.

* **Architecture**:
  * Moved export state management to `ProjectManager` for better lifecycle handling.
  * Refactored `PropertiesPanel` sections to be more composable (custom headers, borders).

1 files changed, 36 insertions, 29 deletions

diff --git a/apps/web/src/hooks/timeline/element/use-element-interaction.ts b/apps/web/src/hooks/timeline/element/use-element-interaction.ts
index 3831a86f..ea01c718 100644
--- a/apps/web/src/hooks/timeline/element/use-element-interaction.ts
+++ b/apps/web/src/hooks/timeline/element/use-element-interaction.ts
@@ -8,6 +8,7 @@ import {
 } from "react";
 import { useEditor } from "@/hooks/use-editor";
 import { useShiftKey } from "@/hooks/use-shift-key";
+import { useTimelineStore } from "@/stores/timeline-store";
 import { useElementSelection } from "@/hooks/timeline/element/use-element-selection";
 import {
 	DRAG_THRESHOLD_PX,
@@ -38,6 +39,8 @@ interface UseElementInteractionProps {
 	onSnapPointChange?: (snapPoint: SnapPoint | null) => void;
 }
 
+const MOUSE_BUTTON_RIGHT = 2;
+
 const initialDragState: ElementDragState = {
 	isDragging: false,
 	elementId: null,
@@ -162,6 +165,7 @@ export function useElementInteraction({
 	onSnapPointChange,
 }: UseElementInteractionProps) {
 	const editor = useEditor();
+	const rippleEditingEnabled = useTimelineStore((s) => s.rippleEditingEnabled);
 	const isShiftHeldRef = useShiftKey();
 	const tracks = editor.timeline.getTracks();
 	const {
@@ -441,27 +445,33 @@ export function useElementInteraction({
 				return;
 			}
 
-			if (dropTarget.isNewTrack) {
-				const newTrackId = generateUUID();
+		if (dropTarget.isNewTrack) {
+			const newTrackId = generateUUID();
 
+			editor.timeline.moveElement({
+				sourceTrackId: dragState.trackId,
+				targetTrackId: newTrackId,
+				elementId: dragState.elementId,
+				newStartTime: snappedTime,
+				createTrack: { type: sourceTrack.type, index: dropTarget.trackIndex },
+				rippleEnabled: rippleEditingEnabled,
+			});
+			selectElement({ trackId: newTrackId, elementId: dragState.elementId });
+		} else {
+			const targetTrack = tracks[dropTarget.trackIndex];
+			if (targetTrack) {
 				editor.timeline.moveElement({
 					sourceTrackId: dragState.trackId,
-					targetTrackId: newTrackId,
+					targetTrackId: targetTrack.id,
 					elementId: dragState.elementId,
 					newStartTime: snappedTime,
-					createTrack: { type: sourceTrack.type, index: dropTarget.trackIndex },
+					rippleEnabled: rippleEditingEnabled,
 				});
-			} else {
-				const targetTrack = tracks[dropTarget.trackIndex];
-				if (targetTrack) {
-					editor.timeline.moveElement({
-						sourceTrackId: dragState.trackId,
-						targetTrackId: targetTrack.id,
-						elementId: dragState.elementId,
-						newStartTime: snappedTime,
-					});
+				if (targetTrack.id !== dragState.trackId) {
+					selectElement({ trackId: targetTrack.id, elementId: dragState.elementId });
 				}
 			}
+		}
 
 			endDrag();
 			onSnapPointChange?.(null);
@@ -483,6 +493,8 @@ export function useElementInteraction({
 		tracksContainerRef,
 		tracksScrollRef,
 		headerRef,
+		rippleEditingEnabled,
+		selectElement,
 	]);
 
 	useEffect(() => {
@@ -508,10 +520,10 @@ export function useElementInteraction({
 			element: TimelineElement;
 			track: TimelineTrack;
 		}) => {
-			const isRightClick = event.button === 2;
+		const isRightClick = event.button === MOUSE_BUTTON_RIGHT;
 
-			// right-click: don't stop propagation so ContextMenu can open
-			if (isRightClick) {
+		// right-click: don't stop propagation so ContextMenu can open
+		if (isRightClick) {
 				const alreadySelected = isElementSelected({
 					trackId: track.id,
 					elementId: element.id,
@@ -526,14 +538,12 @@ export function useElementInteraction({
 				return;
 			}
 
-			// left-click: stop propagation for drag operations
-			event.stopPropagation();
-			mouseDownLocationRef.current = { x: event.clientX, y: event.clientY };
+		event.stopPropagation();
+		mouseDownLocationRef.current = { x: event.clientX, y: event.clientY };
 
-			const isMultiSelect = event.metaKey || event.ctrlKey || event.shiftKey;
+		const isMultiSelect = event.metaKey || event.ctrlKey || event.shiftKey;
 
-			// multi-select: toggle selection
-			if (isMultiSelect) {
+		if (isMultiSelect) {
 				handleSelectionClick({
 					trackId: track.id,
 					elementId: element.id,
@@ -541,8 +551,7 @@ export function useElementInteraction({
 				});
 			}
 
-			// start drag
-			const clickOffsetTime = getClickOffsetTime({
+		const clickOffsetTime = getClickOffsetTime({
 				clientX: event.clientX,
 				elementRect: event.currentTarget.getBoundingClientRect(),
 				zoomLevel,
@@ -570,10 +579,9 @@ export function useElementInteraction({
 			element: TimelineElement;
 			track: TimelineTrack;
 		}) => {
-			event.stopPropagation();
+		event.stopPropagation();
 
-			// was it a drag or a click?
-			if (mouseDownLocationRef.current) {
+		if (mouseDownLocationRef.current) {
 				const deltaX = Math.abs(event.clientX - mouseDownLocationRef.current.x);
 				const deltaY = Math.abs(event.clientY - mouseDownLocationRef.current.y);
 				if (deltaX > DRAG_THRESHOLD_PX || deltaY > DRAG_THRESHOLD_PX) {
@@ -585,8 +593,7 @@ export function useElementInteraction({
 			// modifier keys already handled in mousedown
 			if (event.metaKey || event.ctrlKey || event.shiftKey) return;
 
-			// single click: select if not selected
-			const alreadySelected = isElementSelected({
+		const alreadySelected = isElementSelected({
 				trackId: track.id,
 				elementId: element.id,
 			});