fix(astal-menu): play the quad-expand pop once, not on a loop

The .quad-pop CSS animation stayed applied for the whole time a quad was expanded,
so every re-layout of the expanded card (module content streaming in, the compact
grid updating beneath the overlay) restarted the transform animation — making the
pop repeat continuously. Remove the class ~340ms after expanding (just past the
300ms animation) so it plays exactly once and no later re-layout can retrigger it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XUWCXM4KhjRkwheaA3X7bP

desktopenvs/hyprlua/astal-menu/ui/quadgrid.py

@@ -16,7 +16,7 @@ from __future__ import annotations
 import gi
 
 gi.require_version("Gtk", "4.0")
-from gi.repository import Gtk  # noqa: E402
+from gi.repository import GLib, Gtk  # noqa: E402
 
 from lib.border import bordered
 from module_base import ModuleSpec
@@ -83,12 +83,19 @@ class QuadGrid(Gtk.Overlay):
             self._expand_holder.append(content)
         self._expanded_id = module_id
         self._expand_reveal.set_reveal_child(True)
-        # bouncy scale pop (CSS @keyframes); the class was cleared on collapse so
-        # re-adding it here replays the animation on every expand.
+        # bouncy scale pop (CSS @keyframes). Keep the class only for the animation's
+        # duration, then drop it: while it's applied, any re-layout of the card (module
+        # content streaming in, the grid updating underneath) restarts the transform
+        # animation, which made the pop loop forever.
         self._expand_card.add_css_class("quad-pop")
+        GLib.timeout_add(340, self._clear_pop)
         self.grid.add_css_class("dimmed")
         card.on_show()
 
+    def _clear_pop(self) -> bool:
+        self._expand_card.remove_css_class("quad-pop")
+        return GLib.SOURCE_REMOVE
+
     def request_collapse(self) -> None:
         self._expand_reveal.set_reveal_child(False)
         self._expand_reveal.set_visible(False)