feat: Add UI support for PTZ presets (#1920)

- Closes #1889

Whilst a simple change theoretically, the card has such a collection of
surfaces that can overlap other surfaces, it's challenging to get this
to work right! There's a real chance this will have broken something
z-index related (e.g. X overlaps Y when it should not), or (for related
reasons) broken curver corners on the card.

src/scss/menu-button.scss

@@ -0,0 +1,12 @@
+@use './button.scss';
+
+ha-icon-button {
+  // Icons in the menu are expected to follow Advanced Camera Card theming
+  // unless they are active (in which case we want to take advantage of the
+  // whatever styling is appropriate, e.g. light icon partially lit).
+  --state-unavailable-color: var(--advanced-camera-card-button-color);
+  --state-inactive-color: var(--advanced-camera-card-button-color);
+
+  color: var(--advanced-camera-card-menu-button-inactive-color);
+  background-color: var(--advanced-camera-card-menu-button-background);
+}