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, 13 insertions, 0 deletions

diff --git a/apps/web/src/lib/effects/definitions/index.ts b/apps/web/src/lib/effects/definitions/index.ts
new file mode 100644
index 00000000..1742b1d7
--- /dev/null
+++ b/apps/web/src/lib/effects/definitions/index.ts
@@ -0,0 +1,13 @@
+import { hasEffect, registerEffect } from "../registry";
+import { blurEffectDefinition } from "./blur";
+
+const defaultEffects = [blurEffectDefinition];
+
+export function registerDefaultEffects(): void {
+	for (const definition of defaultEffects) {
+		if (hasEffect({ effectType: definition.type })) {
+			continue;
+		}
+		registerEffect({ definition });
+	}
+}