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, 211 insertions, 0 deletions

diff --git a/apps/web/src/components/editor/panels/properties/clip-effects-properties.tsx b/apps/web/src/components/editor/panels/properties/clip-effects-properties.tsx
new file mode 100644
index 00000000..1caf73eb
--- /dev/null
+++ b/apps/web/src/components/editor/panels/properties/clip-effects-properties.tsx
@@ -0,0 +1,211 @@
+"use client";
+
+import { useState } from "react";
+import type { Effect } from "@/types/effects";
+import type { VisualElement } from "@/types/timeline";
+import { getEffect } from "@/lib/effects/registry";
+import { useEditor } from "@/hooks/use-editor";
+import { usePropertiesStore } from "@/stores/properties-store";
+import {
+	Section,
+	SectionContent,
+	SectionHeader,
+	SectionTitle,
+	SectionFields,
+} from "./section";
+import { EffectParamField } from "./effect-param-field";
+import { Button } from "@/components/ui/button";
+import { HugeiconsIcon } from "@hugeicons/react";
+import {
+	ArrowLeft01Icon,
+	Delete02Icon,
+	ViewIcon,
+	ViewOffSlashIcon,
+} from "@hugeicons/core-free-icons";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import { cn } from "@/utils/ui";
+export function ClipEffectsProperties({
+	element,
+	trackId,
+}: {
+	element: VisualElement;
+	trackId: string;
+}) {
+	const closeClipEffects = usePropertiesStore(
+		(state) => state.closeClipEffects,
+	);
+	const editor = useEditor();
+	const effects = element.effects ?? [];
+
+	const [dragIndex, setDragIndex] = useState<number | null>(null);
+	const [dropIndex, setDropIndex] = useState<number | null>(null);
+
+	const handleDragStart = ({ index }: { index: number }) => {
+		setDragIndex(index);
+	};
+
+	const handleDragOver = ({ event, index }: { event: React.DragEvent; index: number }) => {
+		event.preventDefault();
+		if (index !== dropIndex) setDropIndex(index);
+	};
+
+	const handleDrop = ({ toIndex }: { toIndex: number }) => {
+		if (dragIndex !== null && dragIndex !== toIndex) {
+			editor.timeline.reorderClipEffects({
+				trackId,
+				elementId: element.id,
+				fromIndex: dragIndex,
+				toIndex,
+			});
+		}
+		setDragIndex(null);
+		setDropIndex(null);
+	};
+
+	const handleDragEnd = () => {
+		setDragIndex(null);
+		setDropIndex(null);
+	};
+
+	return (
+		<div className="flex h-full flex-col">
+			<div className="flex h-11 shrink-0 items-center gap-2 border-b px-1.5">
+				<Button
+					variant="ghost"
+					size="icon"
+					onClick={closeClipEffects}
+					aria-label="Back to properties"
+				>
+					<HugeiconsIcon icon={ArrowLeft01Icon} />
+				</Button>
+				<span className="text-sm font-medium">Effects</span>
+			</div>
+			<ScrollArea className="flex-1 scrollbar-hidden">
+				{effects.map((effect, index) => (
+					// biome-ignore lint/a11y/noStaticElementInteractions: drag-and-drop list reorder
+					<div
+						key={effect.id}
+						draggable
+					onDragStart={() => handleDragStart({ index })}
+					onDragOver={(event) => handleDragOver({ event, index })}
+					onDrop={() => handleDrop({ toIndex: index })}
+						onDragEnd={handleDragEnd}
+						className={cn(
+							"group",
+							dragIndex === index && "opacity-40",
+							dropIndex === index &&
+								dragIndex !== null &&
+								dragIndex !== index &&
+								(index < dragIndex
+									? "border-t-2 border-primary"
+									: "border-b-2 border-primary"),
+						)}
+					>
+						<ClipEffectSection
+							effect={effect}
+							element={element}
+							trackId={trackId}
+						/>
+					</div>
+				))}
+			</ScrollArea>
+		</div>
+	);
+}
+
+function ClipEffectSection({
+	effect,
+	element,
+	trackId,
+}: {
+	effect: Effect;
+	element: VisualElement;
+	trackId: string;
+}) {
+	const editor = useEditor();
+	const definition = getEffect({ effectType: effect.type });
+
+	const previewParam = ({ key }: { key: string }) => (value: number | string | boolean) => {
+		const updatedEffects = (element.effects ?? []).map((existing) =>
+			existing.id !== effect.id
+				? existing
+				: { ...existing, params: { ...existing.params, [key]: value } },
+		);
+		editor.timeline.previewElements({
+			updates: [
+				{
+					trackId,
+					elementId: element.id,
+					updates: { effects: updatedEffects },
+				},
+			],
+		});
+	};
+
+	const commitParam = () => editor.timeline.commitPreview();
+
+	const toggleEffect = () =>
+		editor.timeline.toggleClipEffect({
+			trackId,
+			elementId: element.id,
+			effectId: effect.id,
+		});
+
+	const removeEffect = () =>
+		editor.timeline.removeClipEffect({
+			trackId,
+			elementId: element.id,
+			effectId: effect.id,
+		});
+
+	return (
+		<Section sectionKey={`clip-effect:${effect.id}`} showTopBorder={false}>
+			<SectionHeader
+				className="cursor-move"
+				trailing={
+					<>
+						<Button
+							variant={effect.enabled ? "secondary" : "ghost"}
+							size="icon"
+							aria-label={`Toggle ${definition.name}`}
+							onClick={toggleEffect}
+						>
+							<HugeiconsIcon
+								icon={effect.enabled ? ViewIcon : ViewOffSlashIcon}
+							/>
+						</Button>
+						<Button
+							variant="ghost"
+							size="icon"
+							aria-label={`Remove ${definition.name}`}
+							onClick={removeEffect}
+						>
+							<HugeiconsIcon icon={Delete02Icon} />
+						</Button>
+					</>
+				}
+			>
+				<SectionTitle
+					className={cn(!effect.enabled && "text-muted-foreground")}
+				>
+					{definition.name}
+				</SectionTitle>
+			</SectionHeader>
+			{effect.enabled && (
+				<SectionContent>
+					<SectionFields>
+						{definition.params.map((param) => (
+							<EffectParamField
+								key={param.key}
+								param={param}
+								value={effect.params[param.key] ?? param.default}
+								onPreview={previewParam({ key: param.key })}
+								onCommit={commitParam}
+							/>
+						))}
+					</SectionFields>
+				</SectionContent>
+			)}
+		</Section>
+	);
+}