feat: player runtime for the Phone library and That New Teacher

Named stores (PyNamespace: dotted access, functions that see their own store first, restored after a
save is loaded), real generators run step by step (next, send, yield as an expression), len/bool through
__len__/__bool__, os/calendar/itertools/pygame_sdl2 helpers, Skip and ToggleLocalVariable actions,
text tags {glitch} and {wave} and plain display of explode/gradient/ruby, SnowBlossom and anim.Blink,
RoundedCorners as a transform, transforms listed in `at`, ATL choice weights that are flags, and
renpy.image_size from the converter's picture sizes.

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

frontend/tests/screens.test.mjs

@@ -294,3 +294,25 @@ test("a redraw keeps the playing video, and one held down button is not rebuilt
   window.dispatchEvent(new window.Event("pointerup"));
   await wait(30);
 });
+
+test("a redraw queued before pointerdown preserves the Return button until click", async () => {
+  const { manager } = setup();
+  const returned = [];
+  try {
+    manager.show("shop", ["skipped"], {}, { call: true, onReturn: (value) => returned.push(value) });
+    const button = buttons(manager.layer).find((element) => element.textContent === "Cancel");
+    manager.refresh(); // MIST's movie timer (or hover) queues the next frame.
+    window.dispatchEvent(new window.Event("pointerdown"));
+    await settle();
+    assert.equal(button.isConnected, true, "a queued redraw must also respect a held pointer");
+    window.dispatchEvent(new window.Event("pointerup"));
+    click(button);
+    assert.deepEqual(returned, [null]);
+    await settle();
+    assert.notEqual(buttons(manager.layer).find((element) => element.textContent === "Cancel"), button,
+      "the deferred redraw runs after the click");
+  } finally {
+    window.dispatchEvent(new window.Event("pointercancel"));
+    manager.destroy();
+  }
+});