fix(ui): harden navigation and queue interactions

src/utils/floatingPosition.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest';
+import { clampFloatingPosition } from './floatingPosition';
+
+describe('floating surface positioning', () => {
+  it('keeps a variable-height menu inside the viewport', () => {
+    expect(clampFloatingPosition(350, 580, 192, 220, 400, 640)).toEqual({
+      x: 200,
+      y: 412,
+    });
+  });
+
+  it('keeps oversized surfaces anchored to the safe gutter', () => {
+    expect(clampFloatingPosition(-20, -10, 700, 900, 400, 640)).toEqual({
+      x: 8,
+      y: 8,
+    });
+  });
+});