feat(ui): partial react rewrite (#77)

## Summary by Sourcery

Export backend data structures to TypeScript for the new React-based UI
and update CI to build additional targets.

New Features:
- Generate TypeScript definitions for core backend structs and enums
used by the UI.
- Now use our own Azure app(_DropOut_) to finish the authorize process.

Enhancements:
- Annotate existing Rust models with ts-rs metadata to control exported
TypeScript shapes, including tagged enums and opaque JSON fields.

Build:
- Add ts-rs as a dependency for generating TypeScript bindings from Rust
types.

CI:
- Extend the Semifold CI workflow to run on the dev branch and build
additional Linux musl and Windows GNU targets using cross where needed.

1 files changed, 63 insertions, 0 deletions

diff --git a/packages/ui/src/components/particle-background.tsx b/packages/ui/src/components/particle-background.tsx
new file mode 100644
index 0000000..2e0b15a
--- /dev/null
+++ b/packages/ui/src/components/particle-background.tsx
@@ -0,0 +1,63 @@
+import { useEffect, useRef } from "react";
+import { SaturnEffect } from "../lib/effects/SaturnEffect";
+
+export function ParticleBackground() {
+  const canvasRef = useRef<HTMLCanvasElement | null>(null);
+  const effectRef = useRef<SaturnEffect | null>(null);
+
+  useEffect(() => {
+    const canvas = canvasRef.current;
+    if (!canvas) return;
+
+    // Instantiate SaturnEffect and attach to canvas
+    let effect: SaturnEffect | null = null;
+    try {
+      effect = new SaturnEffect(canvas);
+      effectRef.current = effect;
+    } catch (err) {
+      // If effect fails, silently degrade (keep background blank)
+      // eslint-disable-next-line no-console
+      console.warn("SaturnEffect initialization failed:", err);
+    }
+
+    const resizeHandler = () => {
+      if (effectRef.current) {
+        try {
+          effectRef.current.resize(window.innerWidth, window.innerHeight);
+        } catch {
+          // ignore
+        }
+      }
+    };
+
+    window.addEventListener("resize", resizeHandler);
+
+    // Expose getter for HomeView interactions (getSaturnEffect)
+    // HomeView will call window.getSaturnEffect()?.handleMouseDown/Move/Up
+    (
+      window as unknown as { getSaturnEffect?: () => SaturnEffect | null }
+    ).getSaturnEffect = () => effectRef.current;
+
+    return () => {
+      window.removeEventListener("resize", resizeHandler);
+      if (effectRef.current) {
+        try {
+          effectRef.current.destroy();
+        } catch {
+          // ignore
+        }
+      }
+      effectRef.current = null;
+      (
+        window as unknown as { getSaturnEffect?: () => SaturnEffect | null }
+      ).getSaturnEffect = undefined;
+    };
+  }, []);
+
+  return (
+    <canvas
+      ref={canvasRef}
+      className="absolute inset-0 z-0 pointer-events-none"
+    />
+  );
+}