style: format frontend with prettier

Mechanical one-shot pass of pnpm format over src/, tests/, tools/, and
root configs. No functional changes; build and type-check verified.

vite.config.ts

@@ -1,9 +1,9 @@
-import { defineConfig } from "vite";
-import react from "@vitejs/plugin-react";
-import tailwindcss from "@tailwindcss/vite";
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import tailwindcss from '@tailwindcss/vite'
 
 // @ts-expect-error process is a nodejs global
-const host = process.env.TAURI_DEV_HOST;
+const host = process.env.TAURI_DEV_HOST
 
 // https://vite.dev/config/
 export default defineConfig(async () => ({
@@ -16,13 +16,13 @@ export default defineConfig(async () => ({
     host: host || false,
     hmr: host
       ? {
-          protocol: "ws",
+          protocol: 'ws',
           host,
           port: 1421,
         }
       : undefined,
     watch: {
-      ignored: ["**/src-tauri/**"],
+      ignored: ['**/src-tauri/**'],
     },
   },
-}));
+}))