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, 275 insertions, 192 deletions

diff --git a/apps/web/src/components/editor/panels/properties/text-properties.tsx b/apps/web/src/components/editor/panels/properties/text-properties.tsx
index 1a17c26a..73f3f1a3 100644
--- a/apps/web/src/components/editor/panels/properties/text-properties.tsx
+++ b/apps/web/src/components/editor/panels/properties/text-properties.tsx
@@ -3,13 +3,23 @@ import { FontPicker } from "@/components/ui/font-picker";
 import type { TextElement } from "@/types/timeline";
 import { NumberField } from "@/components/ui/number-field";
 import { useRef } from "react";
-import { Section, SectionContent, SectionField, SectionFields, SectionHeader } from "./section";
+import {
+	Section,
+	SectionContent,
+	SectionField,
+	SectionFields,
+	SectionHeader,
+	SectionTitle,
+} from "./section";
 import { ColorPicker } from "@/components/ui/color-picker";
+import { Button } from "@/components/ui/button";
 import { uppercase } from "@/utils/string";
 import { clamp } from "@/utils/math";
 import { useEditor } from "@/hooks/use-editor";
 import { DEFAULT_COLOR } from "@/constants/project-constants";
 import {
+	CORNER_RADIUS_MAX,
+	CORNER_RADIUS_MIN,
 	DEFAULT_LETTER_SPACING,
 	DEFAULT_LINE_HEIGHT,
 	DEFAULT_TEXT_BACKGROUND,
@@ -20,30 +30,13 @@ import {
 import { usePropertyDraft } from "./hooks/use-property-draft";
 import { TransformSection, BlendingSection } from "./sections";
 import { HugeiconsIcon } from "@hugeicons/react";
-import { TextFontIcon } from "@hugeicons/core-free-icons";
+import {
+	TextFontIcon,
+	ViewIcon,
+	ViewOffSlashIcon,
+} from "@hugeicons/core-free-icons";
 import { OcTextHeightIcon, OcTextWidthIcon } from "@opencut/ui/icons";
-
-function createOffsetConverter({
-	defaultValue,
-	scale = 1,
-	min,
-}: {
-	defaultValue: number;
-	scale?: number;
-	min?: number;
-}) {
-	return {
-		toDisplay: (value: number) => Math.round((value - defaultValue) * scale),
-		fromDisplay: (display: number) => {
-			const stored = defaultValue + display / scale;
-			return min !== undefined ? Math.max(min, stored) : stored;
-		},
-	};
-}
-
-const lineHeightConverter = createOffsetConverter({ defaultValue: DEFAULT_LINE_HEIGHT, scale: 10 });
-const paddingXConverter = createOffsetConverter({ defaultValue: DEFAULT_TEXT_BACKGROUND.paddingX, min: 0 });
-const paddingYConverter = createOffsetConverter({ defaultValue: DEFAULT_TEXT_BACKGROUND.paddingY, min: 0 });
+import { cn } from "@/utils/ui";
 
 export function TextProperties({
 	element,
@@ -86,8 +79,8 @@ function ContentSection({
 	});
 
 	return (
-		<Section collapsible sectionKey="text:content" hasBorderTop={false}>
-			<SectionHeader title="Content" />
+		<Section collapsible sectionKey="text:content" showTopBorder={false}>
+			<SectionHeader><SectionTitle>Content</SectionTitle></SectionHeader>
 			<SectionContent>
 				<Textarea
 					placeholder="Name"
@@ -129,71 +122,71 @@ function TypographySection({
 
 	return (
 		<Section collapsible sectionKey="text:typography">
-		<SectionHeader title="Typography" />
-		<SectionContent>
-			<SectionFields>
-				<SectionField label="Font">
-					<FontPicker
-						defaultValue={element.fontFamily}
-						onValueChange={(value) =>
-							editor.timeline.updateElements({
-								updates: [
-									{
-										trackId,
-										elementId: element.id,
-										updates: { fontFamily: value },
-									},
-								],
-							})
-						}
-					/>
-				</SectionField>
-				<SectionField label="Size">
-					<NumberField
-						value={fontSize.displayValue}
-						min={MIN_FONT_SIZE}
-						max={MAX_FONT_SIZE}
-						onFocus={fontSize.onFocus}
-						onChange={fontSize.onChange}
-						onBlur={fontSize.onBlur}
-						onScrub={fontSize.scrubTo}
-						onScrubEnd={fontSize.commitScrub}
-						onReset={() =>
-							editor.timeline.updateElements({
-								updates: [
-									{
-										trackId,
-										elementId: element.id,
-										updates: { fontSize: DEFAULT_TEXT_ELEMENT.fontSize },
-									},
-								],
-							})
-						}
-						isDefault={element.fontSize === DEFAULT_TEXT_ELEMENT.fontSize}
-						icon={<HugeiconsIcon icon={TextFontIcon} />}
-					/>
-				</SectionField>
-				<SectionField label="Color">
-					<ColorPicker
-						value={uppercase({
-							string: (element.color || "FFFFFF").replace("#", ""),
-						})}
-						onChange={(color) =>
-							editor.timeline.previewElements({
-								updates: [
-									{
-										trackId,
-										elementId: element.id,
-										updates: { color: `#${color}` },
-									},
-								],
-							})
-						}
-						onChangeEnd={() => editor.timeline.commitPreview()}
-					/>
-				</SectionField>
-			</SectionFields>
-		</SectionContent>
+			<SectionHeader><SectionTitle>Typography</SectionTitle></SectionHeader>
+			<SectionContent>
+				<SectionFields>
+					<SectionField label="Font">
+						<FontPicker
+							defaultValue={element.fontFamily}
+							onValueChange={(value) =>
+								editor.timeline.updateElements({
+									updates: [
+										{
+											trackId,
+											elementId: element.id,
+											updates: { fontFamily: value },
+										},
+									],
+								})
+							}
+						/>
+					</SectionField>
+					<SectionField label="Size">
+						<NumberField
+							value={fontSize.displayValue}
+							min={MIN_FONT_SIZE}
+							max={MAX_FONT_SIZE}
+							onFocus={fontSize.onFocus}
+							onChange={fontSize.onChange}
+							onBlur={fontSize.onBlur}
+							onScrub={fontSize.scrubTo}
+							onScrubEnd={fontSize.commitScrub}
+							onReset={() =>
+								editor.timeline.updateElements({
+									updates: [
+										{
+											trackId,
+											elementId: element.id,
+											updates: { fontSize: DEFAULT_TEXT_ELEMENT.fontSize },
+										},
+									],
+								})
+							}
+							isDefault={element.fontSize === DEFAULT_TEXT_ELEMENT.fontSize}
+							icon={<HugeiconsIcon icon={TextFontIcon} />}
+						/>
+					</SectionField>
+					<SectionField label="Color">
+						<ColorPicker
+							value={uppercase({
+								string: (element.color || "FFFFFF").replace("#", ""),
+							})}
+							onChange={(color) =>
+								editor.timeline.previewElements({
+									updates: [
+										{
+											trackId,
+											elementId: element.id,
+											updates: { color: `#${color}` },
+										},
+									],
+								})
+							}
+							onChangeEnd={() => editor.timeline.commitPreview()}
+						/>
+					</SectionField>
+				</SectionFields>
+			</SectionContent>
 		</Section>
 	);
 }
@@ -208,72 +201,98 @@ function SpacingSection({
 	const editor = useEditor();
 
 	const letterSpacing = usePropertyDraft({
-		displayValue: Math.round(element.letterSpacing ?? DEFAULT_LETTER_SPACING).toString(),
+		displayValue: Math.round(
+			element.letterSpacing ?? DEFAULT_LETTER_SPACING,
+		).toString(),
 		parse: (input) => {
 			const parsed = parseFloat(input);
 			return Number.isNaN(parsed) ? null : Math.round(parsed);
 		},
 		onPreview: (value) =>
 			editor.timeline.previewElements({
-				updates: [{ trackId, elementId: element.id, updates: { letterSpacing: value } }],
+				updates: [
+					{ trackId, elementId: element.id, updates: { letterSpacing: value } },
+				],
 			}),
 		onCommit: () => editor.timeline.commitPreview(),
 	});
 
 	const lineHeight = usePropertyDraft({
-		displayValue: lineHeightConverter.toDisplay(element.lineHeight ?? DEFAULT_LINE_HEIGHT).toString(),
+		displayValue: (element.lineHeight ?? DEFAULT_LINE_HEIGHT).toFixed(1),
 		parse: (input) => {
 			const parsed = parseFloat(input);
-			return Number.isNaN(parsed) ? null : lineHeightConverter.fromDisplay(Math.round(parsed));
+			return Number.isNaN(parsed)
+				? null
+				: Math.max(0.1, Math.round(parsed * 10) / 10);
 		},
 		onPreview: (value) =>
 			editor.timeline.previewElements({
-				updates: [{ trackId, elementId: element.id, updates: { lineHeight: value } }],
+				updates: [
+					{ trackId, elementId: element.id, updates: { lineHeight: value } },
+				],
 			}),
 		onCommit: () => editor.timeline.commitPreview(),
 	});
 
 	return (
-		<Section collapsible sectionKey="text:spacing" hasBorderBottom={false}>
-			<SectionHeader title="Spacing" />
-		<SectionContent>
-			<div className="flex items-start gap-2">
-				<SectionField label="Letter spacing" className="w-1/2">
-					<NumberField
-						value={letterSpacing.displayValue}
-						onFocus={letterSpacing.onFocus}
-						onChange={letterSpacing.onChange}
-						onBlur={letterSpacing.onBlur}
-						onScrub={letterSpacing.scrubTo}
-						onScrubEnd={letterSpacing.commitScrub}
-						onReset={() =>
-							editor.timeline.updateElements({
-								updates: [{ trackId, elementId: element.id, updates: { letterSpacing: DEFAULT_LETTER_SPACING } }],
-							})
-						}
-						isDefault={(element.letterSpacing ?? DEFAULT_LETTER_SPACING) === DEFAULT_LETTER_SPACING}
-						icon={<OcTextWidthIcon size={14} />}
-					/>
-				</SectionField>
-				<SectionField label="Line height" className="w-1/2">
-					<NumberField
-						value={lineHeight.displayValue}
-						onFocus={lineHeight.onFocus}
-						onChange={lineHeight.onChange}
-						onBlur={lineHeight.onBlur}
-						onScrub={lineHeight.scrubTo}
-						onScrubEnd={lineHeight.commitScrub}
-						onReset={() =>
-							editor.timeline.updateElements({
-								updates: [{ trackId, elementId: element.id, updates: { lineHeight: DEFAULT_LINE_HEIGHT } }],
-							})
-						}
-						isDefault={(element.lineHeight ?? DEFAULT_LINE_HEIGHT) === DEFAULT_LINE_HEIGHT}
-						icon={<OcTextHeightIcon size={14} />}
-					/>
-				</SectionField>
-			</div>
-		</SectionContent>
+		<Section collapsible sectionKey="text:spacing" showBottomBorder={false}>
+			<SectionHeader><SectionTitle>Spacing</SectionTitle></SectionHeader>
+			<SectionContent>
+				<div className="flex items-start gap-2">
+					<SectionField label="Letter spacing" className="w-1/2">
+						<NumberField
+							value={letterSpacing.displayValue}
+							onFocus={letterSpacing.onFocus}
+							onChange={letterSpacing.onChange}
+							onBlur={letterSpacing.onBlur}
+							onScrub={letterSpacing.scrubTo}
+							onScrubEnd={letterSpacing.commitScrub}
+							onReset={() =>
+								editor.timeline.updateElements({
+									updates: [
+										{
+											trackId,
+											elementId: element.id,
+											updates: { letterSpacing: DEFAULT_LETTER_SPACING },
+										},
+									],
+								})
+							}
+							isDefault={
+								(element.letterSpacing ?? DEFAULT_LETTER_SPACING) ===
+								DEFAULT_LETTER_SPACING
+							}
+							icon={<OcTextWidthIcon size={14} />}
+						/>
+					</SectionField>
+					<SectionField label="Line height" className="w-1/2">
+						<NumberField
+							value={lineHeight.displayValue}
+							onFocus={lineHeight.onFocus}
+							onChange={lineHeight.onChange}
+							onBlur={lineHeight.onBlur}
+							onScrub={lineHeight.scrubTo}
+							onScrubEnd={lineHeight.commitScrub}
+							onReset={() =>
+								editor.timeline.updateElements({
+									updates: [
+										{
+											trackId,
+											elementId: element.id,
+											updates: { lineHeight: DEFAULT_LINE_HEIGHT },
+										},
+									],
+								})
+							}
+							isDefault={
+								(element.lineHeight ?? DEFAULT_LINE_HEIGHT) ===
+								DEFAULT_LINE_HEIGHT
+							}
+							icon={<OcTextHeightIcon size={14} />}
+						/>
+					</SectionField>
+				</div>
+			</SectionContent>
 		</Section>
 	);
 }
@@ -289,10 +308,21 @@ function BackgroundSection({
 	const lastSelectedColor = useRef(DEFAULT_COLOR);
 
 	const cornerRadius = usePropertyDraft({
-		displayValue: Math.round(element.background.cornerRadius ?? 0).toString(),
+		displayValue: Math.round(
+			clamp({
+				value: element.background.cornerRadius ?? 0,
+				min: CORNER_RADIUS_MIN,
+				max: CORNER_RADIUS_MAX,
+			}),
+		).toString(),
 		parse: (input) => {
 			const parsed = parseFloat(input);
-			return Number.isNaN(parsed) ? null : Math.max(0, Math.round(parsed));
+			if (Number.isNaN(parsed)) return null;
+			return clamp({
+				value: Math.round(parsed),
+				min: CORNER_RADIUS_MIN,
+				max: CORNER_RADIUS_MAX,
+			});
 		},
 		onPreview: (value) =>
 			editor.timeline.previewElements({
@@ -310,10 +340,12 @@ function BackgroundSection({
 	});
 
 	const paddingX = usePropertyDraft({
-		displayValue: paddingXConverter.toDisplay(element.background.paddingX ?? DEFAULT_TEXT_BACKGROUND.paddingX).toString(),
+		displayValue: Math.round(
+			element.background.paddingX ?? DEFAULT_TEXT_BACKGROUND.paddingX,
+		).toString(),
 		parse: (input) => {
 			const parsed = parseFloat(input);
-			return Number.isNaN(parsed) ? null : paddingXConverter.fromDisplay(Math.round(parsed));
+			return Number.isNaN(parsed) ? null : Math.max(0, Math.round(parsed));
 		},
 		onPreview: (value) =>
 			editor.timeline.previewElements({
@@ -329,10 +361,12 @@ function BackgroundSection({
 	});
 
 	const paddingY = usePropertyDraft({
-		displayValue: paddingYConverter.toDisplay(element.background.paddingY ?? DEFAULT_TEXT_BACKGROUND.paddingY).toString(),
+		displayValue: Math.round(
+			element.background.paddingY ?? DEFAULT_TEXT_BACKGROUND.paddingY,
+		).toString(),
 		parse: (input) => {
 			const parsed = parseFloat(input);
-			return Number.isNaN(parsed) ? null : paddingYConverter.fromDisplay(Math.round(parsed));
+			return Number.isNaN(parsed) ? null : Math.max(0, Math.round(parsed));
 		},
 		onPreview: (value) =>
 			editor.timeline.previewElements({
@@ -385,14 +419,63 @@ function BackgroundSection({
 		onCommit: () => editor.timeline.commitPreview(),
 	});
 
+	const toggleBackgroundEnabled = () => {
+		const enabled = !element.background.enabled;
+		const color =
+			enabled && element.background.color === "transparent"
+				? lastSelectedColor.current
+				: element.background.color;
+		editor.timeline.updateElements({
+			updates: [
+				{
+					trackId,
+					elementId: element.id,
+					updates: {
+						background: {
+							...element.background,
+							enabled,
+							color,
+						},
+					},
+				},
+			],
+		});
+	};
+
 	return (
-		<Section collapsible sectionKey="text:background">
-			<SectionHeader title="Background" />
-			<SectionContent>
+		<Section
+			collapsible
+			defaultOpen={element.background.enabled}
+			sectionKey="text:background"
+		>
+			<SectionHeader
+				trailing={
+					<Button
+						variant="ghost"
+						size="icon"
+						onClick={(event) => {
+							event.stopPropagation();
+							toggleBackgroundEnabled();
+						}}
+					>
+						<HugeiconsIcon
+							icon={element.background.enabled ? ViewIcon : ViewOffSlashIcon}
+						/>
+					</Button>
+				}
+			>
+				<SectionTitle>Background</SectionTitle>
+			</SectionHeader>
+			<SectionContent
+				className={cn(
+					!element.background.enabled && "pointer-events-none opacity-50",
+				)}
+			>
 				<SectionFields>
 					<SectionField label="Color">
 						<ColorPicker
 							value={
+								!element.background.enabled ||
 								element.background.color === "transparent"
 									? lastSelectedColor.current.replace("#", "")
 									: element.background.color.replace("#", "")
@@ -415,19 +498,14 @@ function BackgroundSection({
 								});
 							}}
 							onChangeEnd={() => editor.timeline.commitPreview()}
-							className={
-								element.background.color === "transparent"
-									? "pointer-events-none opacity-50"
-									: ""
-							}
 						/>
 					</SectionField>
 					<div className="flex items-start gap-2">
-					<SectionField label="Width" className="w-1/2">
-						<NumberField
-							icon="W"
-							value={paddingX.displayValue}
-							min={0}
+						<SectionField label="Width" className="w-1/2">
+							<NumberField
+								icon="W"
+								value={paddingX.displayValue}
+								min={0}
 								onFocus={paddingX.onFocus}
 								onChange={paddingX.onChange}
 								onBlur={paddingX.onBlur}
@@ -450,16 +528,17 @@ function BackgroundSection({
 									})
 								}
 								isDefault={
-									(element.background.paddingX ?? DEFAULT_TEXT_BACKGROUND.paddingX) ===
+									(element.background.paddingX ??
+										DEFAULT_TEXT_BACKGROUND.paddingX) ===
 									DEFAULT_TEXT_BACKGROUND.paddingX
 								}
 							/>
 						</SectionField>
-					<SectionField label="Height" className="w-1/2">
-						<NumberField
-							icon="H"
-							value={paddingY.displayValue}
-							min={0}
+						<SectionField label="Height" className="w-1/2">
+							<NumberField
+								icon="H"
+								value={paddingY.displayValue}
+								min={0}
 								onFocus={paddingY.onFocus}
 								onChange={paddingY.onChange}
 								onBlur={paddingY.onBlur}
@@ -482,17 +561,18 @@ function BackgroundSection({
 									})
 								}
 								isDefault={
-									(element.background.paddingY ?? DEFAULT_TEXT_BACKGROUND.paddingY) ===
+									(element.background.paddingY ??
+										DEFAULT_TEXT_BACKGROUND.paddingY) ===
 									DEFAULT_TEXT_BACKGROUND.paddingY
 								}
 							/>
 						</SectionField>
 					</div>
 					<div className="flex items-start gap-2">
-					<SectionField label="X-offset" className="w-1/2">
-						<NumberField
-							icon="X"
-							value={offsetX.displayValue}
+						<SectionField label="X-offset" className="w-1/2">
+							<NumberField
+								icon="X"
+								value={offsetX.displayValue}
 								onFocus={offsetX.onFocus}
 								onChange={offsetX.onChange}
 								onBlur={offsetX.onBlur}
@@ -505,19 +585,19 @@ function BackgroundSection({
 												trackId,
 												elementId: element.id,
 												updates: {
-													background: { ...element.background, offsetX: 0 },
-												},
+												background: { ...element.background, offsetX: DEFAULT_TEXT_BACKGROUND.offsetX },
 											},
-										],
-									})
-								}
-								isDefault={(element.background.offsetX ?? 0) === 0}
+										},
+									],
+								})
+							}
+							isDefault={(element.background.offsetX ?? DEFAULT_TEXT_BACKGROUND.offsetX) === DEFAULT_TEXT_BACKGROUND.offsetX}
 							/>
 						</SectionField>
-					<SectionField label="Y-offset" className="w-1/2">
-						<NumberField
-							icon="Y"
-							value={offsetY.displayValue}
+						<SectionField label="Y-offset" className="w-1/2">
+							<NumberField
+								icon="Y"
+								value={offsetY.displayValue}
 								onFocus={offsetY.onFocus}
 								onChange={offsetY.onChange}
 								onBlur={offsetY.onBlur}
@@ -530,21 +610,22 @@ function BackgroundSection({
 												trackId,
 												elementId: element.id,
 												updates: {
-													background: { ...element.background, offsetY: 0 },
-												},
+												background: { ...element.background, offsetY: DEFAULT_TEXT_BACKGROUND.offsetY },
 											},
-										],
-									})
-								}
-								isDefault={(element.background.offsetY ?? 0) === 0}
+										},
+									],
+								})
+							}
+							isDefault={(element.background.offsetY ?? DEFAULT_TEXT_BACKGROUND.offsetY) === DEFAULT_TEXT_BACKGROUND.offsetY}
 							/>
 						</SectionField>
 					</div>
-				<SectionField label="Corner Radius">
-					<NumberField
-						icon="R"
-						value={cornerRadius.displayValue}
-						min={0}
+					<SectionField label="Corner radius">
+						<NumberField
+							icon="R"
+							value={cornerRadius.displayValue}
+							min={CORNER_RADIUS_MIN}
+							max={CORNER_RADIUS_MAX}
 							onFocus={cornerRadius.onFocus}
 							onChange={cornerRadius.onChange}
 							onBlur={cornerRadius.onBlur}
@@ -557,16 +638,18 @@ function BackgroundSection({
 											trackId,
 											elementId: element.id,
 											updates: {
-												background: {
-													...element.background,
-													cornerRadius: 0,
-												},
+											background: {
+												...element.background,
+												cornerRadius: CORNER_RADIUS_MIN,
+											},
 											},
 										},
 									],
 								})
 							}
-							isDefault={(element.background.cornerRadius ?? 0) === 0}
+							isDefault={
+								(element.background.cornerRadius ?? 0) === CORNER_RADIUS_MIN
+							}
 						/>
 					</SectionField>
 				</SectionFields>