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/services/storage/migrations/index.ts

@@ -6,10 +6,11 @@ import { V3toV4Migration } from "./v3-to-v4";
 import { V4toV5Migration } from "./v4-to-v5";
 import { V5toV6Migration } from "./v5-to-v6";
 import { V6toV7Migration } from "./v6-to-v7";
+import { V7toV8Migration } from "./v7-to-v8";
 export { runStorageMigrations } from "./runner";
 export type { MigrationProgress } from "./runner";
 
-export const CURRENT_PROJECT_VERSION = 7;
+export const CURRENT_PROJECT_VERSION = 8;
 
 export const migrations = [
 	new V0toV1Migration(),
@@ -19,4 +20,5 @@ export const migrations = [
 	new V4toV5Migration(),
 	new V5toV6Migration(),
 	new V6toV7Migration(),
+	new V7toV8Migration(),
 ];