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.

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+## **0.2.0**:
+
+This release adds the foundation for motion and effects.
+
+**Features**:
+
+- Keyframe animation system, starting with transform properties (position, scale, rotation).
+- Effects system (with our first effect: Blur!)
+
+**Bug fixes**:
+
+- Fixed an issue where click-and-drag selection on one timeline track could accidentally select items from the track below
+
+**Improvements**:
+
+## **0.1.0**:
+
+This first release focuses on making editing faster, clearer, and more reliable for day-to-day use.
+
+**Features**:
+
+- Rebuilt the properties panel from scratch. Number inputs now support math expressions and click-drag scrubbing instead of just typing values in.
+- The properties panel went from a flat list of basic text styles to organized sections: transform, blending, typography, spacing, and background controls. Text elements finally have position, scale, and rotation.
+- New color picker with eyedropper, opacity control, and multiple color formats.
+- Bookmarks now support notes, color labels, and optional duration to plan scenes more clearly.
+- Move, scale, and rotate elements directly in the preview panel.
+- Blend modes (Multiply, Screen, Overlay, etc). Only available on text elements for now.
+- Paste images, videos, or audio from your clipboard straight into the editor.
+- Hold `Shift` while moving or resizing to temporarily turn off snapping.
+
+**Improvements**:
+
+- Expanded font selection from 7 to over 1,000.
+- Fonts load much faster.
+- All asset panel tabs now share a consistent layout.
+- Text rendering properly supports multiple lines, line height, and letter spacing.
+- Better contrast in the dark theme.
+
+**Bug fixes**:
+
+- Fixed undo/redo for drag-and-drop so dropped items are reliably undoable.