feat(ui): the gamepad moves the focus, presses and goes back; a held direction repeats on the clock

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/library/ui_gamepad_parts/Pad.ludic

@@ -0,0 +1,7 @@
+# Pad.ludic - eight buttons, a range, a select and a button that opens a popover, for a gamepad
+component Pad {
+  state last: int = -1
+  state vol: int = 0
+  state q: int = 0
+  state open: bool = false
+}