Type a repeat delay as whole milliseconds

The two On key down fields read in milliseconds now, and say so in their
labels. A number field shows three decimals unless a property asks for
fewer, so both params set decimals: 0 – the field reads 300, not 300.000,
and rounds to whole milliseconds while typing or scrubbing. The clock
behind it still counts seconds; the conversion sits at the one place that
reads the properties.

tests/core/key-repeat.test.ts

@@ -6,6 +6,7 @@ import { describe, expect, it } from 'vitest';
 import { nodeDef } from '../../src/core/graph';
 import { MIN_REPEAT_INTERVAL, stepKeyRepeat } from '../../src/core/graph/keyRepeat';
 import type { PropertyBag } from '../../src/core/model/Properties';
+import { formatNumber } from '../../src/ui/math';
 
 const held = { pressed: false, down: true, dt: 0.1, after: 0.2, interval: 0.2 };
 
@@ -71,3 +72,17 @@ describe('the repeat rows on the node body', () => {
     expect(hidden({ key: 'a', repeatAfter: 300, repeatInterval: 0 })).toEqual([]);
   });
 });
+
+describe('the repeat fields in the inspector', () => {
+  const param = (key: string) => {
+    const def = nodeDef('OnKeyDown')?.params.find((p) => p.key === key);
+    return def?.kind === 'number' ? def : null;
+  };
+
+  it('types both as whole milliseconds, so the field shows 300 and not 300.000', () => {
+    for (const key of ['repeatAfter', 'repeatInterval']) {
+      expect(param(key)?.decimals).toBe(0);
+      expect(formatNumber(300, param(key)?.decimals)).toBe('300');
+    }
+  });
+});