feat: introduce WebGL effects system and Blur effect

This implements the foundational architecture for video effects, starting with a multi-pass WebGL rendering pipeline and a customizable Gaussian Blur effect.

Key changes:
- WebGL Engine: Added `raw-loader` for `.glsl` shaders, multi-pass framebuffer rendering, and live offscreen canvas previews.
- Node Architecture: Replaced hardcoded background blur with `CompositeEffectNode` and added `EffectLayerNode` to apply effects to specific visual elements.
- Timeline & DND: Added a new `effect` track type. Upgraded drag-and-drop to support dropping effects directly onto the timeline. Consolidated track constants into a cleaner `TRACK_CONFIG`.
- UI/UX: Added an Effects tab in the assets panel with live previews. Added an Effect Properties panel with sliders and inputs for fine-tuning parameters.
- Data Model: Added `sourceDuration` to video and audio elements, and wrote a v8 storage migration to update existing projects to the new schema.
- Docs: Added `CHANGELOG.md` tracking v0.1.0 and v0.2.0, plus `docs/effects-renderer.md` to document the new WebGL pipeline.

1 files changed, 34 insertions, 0 deletions

diff --git a/apps/web/src/lib/effects/index.ts b/apps/web/src/lib/effects/index.ts
new file mode 100644
index 00000000..14d06d84
--- /dev/null
+++ b/apps/web/src/lib/effects/index.ts
@@ -0,0 +1,34 @@
+import { generateUUID } from "@/utils/id";
+import { getEffect } from "./registry";
+import type { Effect, EffectParamValues } from "@/types/effects";
+import type { VisualElement } from "@/types/timeline";
+
+export { getEffect, getAllEffects, hasEffect, registerEffect } from "./registry";
+export { registerDefaultEffects } from "./definitions";
+
+export const EFFECT_TARGET_ELEMENT_TYPES: VisualElement["type"][] = [
+	"video",
+	"image",
+	"text",
+	"sticker",
+];
+
+export function buildDefaultEffectInstance({
+	effectType,
+}: {
+	effectType: string;
+}): Effect {
+	const definition = getEffect({ effectType });
+
+	const params: EffectParamValues = {};
+	for (const paramDef of definition.params) {
+		params[paramDef.key] = paramDef.default;
+	}
+
+	return {
+		id: generateUUID(),
+		type: effectType,
+		params,
+		enabled: true,
+	};
+}