pets get their action bar, macros arrive, and hunters draw the bow

- a hunter's or warlock's pet has its action bar now: attack, follow, stay, the pet's own spells with cooldowns and autocast sparkles
- the macro system lands: the macro window, the icon chooser, /cast and /macro, and macros dragged onto the action bar
- hunter shots look right at last: the bow draws and releases on the shot, and the arrow lays a spark trail its whole flight
- the options window re-dresses in 1.12's own art with the classic dialog look, and gets a working search box and clickable steppers

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/benilla-protocol/src/messages/update_object/fields/unit.rs

@@ -32,6 +32,12 @@ impl ObjectFields {
     pub fn unit_channel_spell(&self) -> u32 {
         self.get_u32(FIELD_UNIT_CHANNEL_SPELL).unwrap_or(0)
     }
+    /// `UNIT_FIELD_SUMMON` — the guid of the unit this one has summoned, or `None`. On our own
+    /// descriptor that is **our pet**, and so the anchor of the `"pet"` unit token (decision 0982).
+    /// The inverse of [`Self::unit_summoned_by`].
+    pub fn unit_summon(&self) -> Option<u64> {
+        self.get_guid(FIELD_UNIT_SUMMON).filter(|&g| g != 0)
+    }
     /// `UNIT_FIELD_SUMMONEDBY` — the summoner's guid (pet/guardian/totem), or `None` (absent or
     /// explicit 0 — an unowned unit).
     pub fn unit_summoned_by(&self) -> Option<u64> {