Migrate to Vite+ (vite-plus) unified toolchain

Replace Vite/Vitest with vite-plus, update WASM loading to native Vite 8
?init pattern, switch React compiler to @rolldown/plugin-babel, and
migrate git hooks from husky to vite-hooks.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vite.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from "vite-plus";
+
+export default defineConfig({
+  test: {
+    exclude: ["**/node_modules/**", "**/flatpak/**"],
+  },
+});