Use jog action for arrow keys.

This now makes the arrow keys work more or less continuously, and stop responsively.

It could do with optimisation so the key rep rate is lower, but the initial wait is shorter. That probably entails adding our own timeout.

webapp/vite.config.mjs

@@ -9,9 +9,7 @@ import vue from "@vitejs/plugin-vue";
 
 // https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [
-    vue(),
-  ],
+  plugins: [vue()],
 
   build: {
     // Output directory for production builds