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, 20 insertions, 0 deletions

diff --git a/apps/web/src/lib/export.ts b/apps/web/src/lib/export.ts
index 67621e16..ae68144b 100644
--- a/apps/web/src/lib/export.ts
+++ b/apps/web/src/lib/export.ts
@@ -16,3 +16,23 @@ export function getExportFileExtension({
 }): string {
 	return `.${format}`;
 }
+
+export function downloadBuffer({
+	buffer,
+	filename,
+	mimeType,
+}: {
+	buffer: ArrayBuffer;
+	filename: string;
+	mimeType: string;
+}): void {
+	const blob = new Blob([buffer], { type: mimeType });
+	const url = URL.createObjectURL(blob);
+	const downloadLink = document.createElement("a");
+	downloadLink.href = url;
+	downloadLink.download = filename;
+	document.body.appendChild(downloadLink);
+	downloadLink.click();
+	document.body.removeChild(downloadLink);
+	URL.revokeObjectURL(url);
+}