fix(ui): harden navigation and queue interactions

src/utils/floatingPosition.ts

@@ -0,0 +1,23 @@
+export interface FloatingPosition {
+  x: number;
+  y: number;
+}
+
+/** Keep a fixed-position surface inside the viewport with a small safe gutter. */
+export const clampFloatingPosition = (
+  x: number,
+  y: number,
+  width: number,
+  height: number,
+  viewportWidth: number,
+  viewportHeight: number,
+  gutter = 8
+): FloatingPosition => {
+  const maxX = Math.max(gutter, viewportWidth - width - gutter);
+  const maxY = Math.max(gutter, viewportHeight - height - gutter);
+
+  return {
+    x: Math.min(Math.max(gutter, x), maxX),
+    y: Math.min(Math.max(gutter, y), maxY),
+  };
+};