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, 19 insertions, 0 deletions

diff --git a/apps/web/src/stores/properties-store.ts b/apps/web/src/stores/properties-store.ts
new file mode 100644
index 00000000..f45f176d
--- /dev/null
+++ b/apps/web/src/stores/properties-store.ts
@@ -0,0 +1,19 @@
+import { create } from "zustand";
+
+interface ClipEffectsTarget {
+	elementId: string;
+	trackId: string;
+}
+
+interface PropertiesState {
+	clipEffectsTarget: ClipEffectsTarget | null;
+	openClipEffects: ({ elementId, trackId }: ClipEffectsTarget) => void;
+	closeClipEffects: () => void;
+}
+
+export const usePropertiesStore = create<PropertiesState>()((set) => ({
+	clipEffectsTarget: null,
+	openClipEffects: ({ elementId, trackId }) =>
+		set({ clipEffectsTarget: { elementId, trackId } }),
+	closeClipEffects: () => set({ clipEffectsTarget: null }),
+}));