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.

apps/web/src/core/index.ts

@@ -8,6 +8,7 @@ import { CommandManager } from "./managers/commands";
 import { SaveManager } from "./managers/save-manager";
 import { AudioManager } from "./managers/audio-manager";
 import { SelectionManager } from "./managers/selection-manager";
+import { registerDefaultEffects } from "@/lib/effects";
 
 export class EditorCore {
 	private static instance: EditorCore | null = null;
@@ -24,6 +25,7 @@ export class EditorCore {
 	public readonly selection: SelectionManager;
 
 	private constructor() {
+		registerDefaultEffects();
 		this.command = new CommandManager();
 		this.playback = new PlaybackManager(this);
 		this.timeline = new TimelineManager(this);