feat: renpy.call_in_new_context("_hide_windows") becomes a click wait

Ren'Py's own _hide_windows label hides the dialogue window until the player clicks. Games call it
directly between scenes, and one of them 531 times. Other labels stay unsupported.

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

backend/app/converter/rpy_parser.py

@@ -370,6 +370,9 @@ class RpyParser:
         args, kw = e["a"], e["kw"]
         if fname == "renpy.pause":
             return [{"op": "pause", "d": args[0] if args else kw.get("delay")}]
+        if fname == "renpy.call_in_new_context" and len(args) == 1 and not kw                 and args[0].get("k") == "const" and args[0]["v"] == "_hide_windows":
+            # Ren'Py's own label: hides the dialogue window until the player clicks
+            return [{"op": "pause", "d": None}]
         if fname == "renpy.jump" and args:
             return [_jump_or_call("jump", args[0])]
         if fname == "renpy.call" and args: