Track a recipe under the top bar

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

game.py

@@ -1090,7 +1090,7 @@ RAID_TRAITS = ["lightly armoured, heavy on archers", "mounted and fast, few bows
 
 # --- world ---------------------------------------------------------------
 
-WORLD_VERSION = 21
+WORLD_VERSION = 22
 
 
 def new_world(now: float, speed: float = 1.0) -> dict:
@@ -1253,6 +1253,10 @@ def migrate(world: dict, now: float | None = None) -> dict:
             for slot in EQUIP_SLOTS:
                 player["equip"].setdefault(slot, None)
         world["version"] = 21
+    if world["version"] < 22:
+        for player in world["players"].values():
+            player.setdefault("tracked", None)
+        world["version"] = 22
     return world
 
 
@@ -1513,6 +1517,7 @@ def new_player(uid: str, name: str, cls: str, now: float) -> dict:
         "garrison": False,
         "donated": 0,
         "pinned": [],  # skills pinned to the top of the sidebar
+        "tracked": None,  # recipe shown under the top bar
     }
 
 
@@ -3962,6 +3967,14 @@ def toggle_pin(player: dict, skill: str) -> str | None:
     return None
 
 
+def toggle_track(player: dict, action_id: str) -> str | None:
+    action = ACTION_BY_ID.get(action_id)
+    if not action or not action["inputs"]:
+        return "No such recipe"
+    player["tracked"] = None if player["tracked"] == action_id else action_id
+    return None
+
+
 # --- icons ------------------------------------------------------------------------
 # Every item, skill, class, building, prayer and output-less action gets a
 # game-icons.net glyph (CC BY 3.0) and a tint. Families share a shape and are