Ignore repeated key events for bound shortcuts, adjust visualization min width (#9537)

Fixes #8538 #9515

All repeated keyboard events handled through `defineShortcuts` are now ignored. For example, holding ctrl+v no longer pastes nodes repeatedly.

Also adjusted visualization min-width to 200px, since it was a trivial change.

![image](https://github.com/enso-org/enso/assets/919491/7997898f-bcee-45f2-aacb-e10a49b159d6)

app/gui2/src/components/VisualizationContainer.vue

@@ -15,10 +15,10 @@ const props = defineProps<{
   belowToolbar?: boolean
 }>()
 
-/** The total width of:
+/** The minimum width must be at least the total width of:
  * - both of toolbars that are always visible (32px + 60px), and
  * - the 4px flex gap between the toolbars. */
-const MIN_WIDTH_PX = 96
+const MIN_WIDTH_PX = 200
 
 const config = useVisualizationConfig()
 
@@ -194,7 +194,7 @@ const resizeBottomRight = usePointer((pos, _, type) => {
 <style scoped>
 .VisualizationContainer {
   --node-height: 32px;
-  --permanent-toolbar-width: 96px;
+  --permanent-toolbar-width: 200px;
   color: var(--color-text);
   background: var(--color-visualization-bg);
   position: absolute;

app/gui2/src/util/shortcuts.ts

@@ -391,6 +391,9 @@ export function defineKeybinds<
     >,
   ): (event: Event_, stopAndPrevent?: boolean) => boolean {
     return (event, stopAndPrevent = true) => {
+      // Do not handle repeated keyboard events (held down key).
+      if (event instanceof KeyboardEvent && event.repeat) return false
+
       const eventModifierFlags = modifierFlagsForEvent(event)
       const keybinds =
         event instanceof KeyboardEvent ?