docs: fill in v0.3.0 technical changelog entries

apps/web/content/changelog/0.3.0.md

@@ -93,5 +93,21 @@ changes:
     text: 'Timeline clips can expand to show a lane for each animated property. Right-click a clip -> "Expand keyframes" to see all properties in their own rows.'
   - type: improved
     text: "If your browser doesn't support GPU-accelerated rendering, the editor now shows a notice explaining why and suggests switching to another browser."
+  - type: technical
+    text: "Ripple editing now has a proper algorithmic foundation. The old inline approach was replaced with a diff-based system in `src/lib/ripple/`: track snapshots before and after an operation are compared as interval sets, vacated intervals are computed (accounting for elements moved to other tracks), and the result is a list of explicit `RippleAdjustment` values applied in a separate pass. Composable, testable, and independent of the command that triggered it."
+  - type: technical
+    text: "Time is now represented as `MediaTime`, an integer tick count at 120,000 ticks per second, defined in `rust/crates/time`. Previously, floating-point seconds were used throughout, which accumulated rounding errors and made frame alignment imprecise. 120,000 was chosen because it divides evenly by every standard frame rate denominator, including drop-frame rates: 23.976 maps to 5,005 ticks/frame, 29.97 to 4,004, 30 to 4,000. `FrameRate` is a rational `{numerator, denominator}` type rather than a float. All time arithmetic, frame snapping, and timecode formatting are implemented in Rust and exposed via WASM."
+  - type: technical
+    text: "Track ordering is now enforced at the type level. `SceneTracks` replaces a flat track array with three explicit fields: `overlay`, `main` (a singleton `VideoTrack`), and `audio`. The type makes it structurally impossible to mix track kinds or misplace a track."
+  - type: technical
+    text: "The WebGL renderer has been replaced with a Rust/wgpu compositor compiled to WASM. The `rust/` crate tree covers compositing (`rust/crates/compositor`), effects (`rust/crates/effects`), masks with JFA-based feathering (`rust/crates/masks`), GPU context (`rust/crates/gpu`), and time (`rust/crates/time`). WASM bindings live in `rust/wasm/` and are consumed from TypeScript through `src/lib/wasm/`. The old GLSL shaders and WebGL utilities are gone."
+  - type: technical
+    text: "`src/types/` and `src/constants/` have been dissolved. All types and constants now live alongside the code that owns them inside `src/lib/`. The `packages/env` and `packages/ui` internal packages were also folded into the web app, with icons at `src/components/icons/` and env at `src/lib/env/`."
+  - type: technical
+    text: "The web app can now deploy to Cloudflare Workers via OpenNext. `wrangler.jsonc` and `apps/web/open-next.config.ts` are included for anyone self-hosting."
+  - type: technical
+    text: "`apps/desktop/` is a new GPUI + Rust app. It is early: there is a `main.rs` and a working build setup, but no features yet."
+  - type: technical
+    text: "16 new storage migration steps were added (v9 through v25), covering the schema changes accumulated during this release cycle."
 
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