Add a world-state edit mode for overriding live RPG values

Players/authors can now directly correct the live values of stats the
schema already defines (health, trust, flags, milestones, etc.) without
waiting for the AI to emit a delta. New apply_override() sets values
absolutely rather than adding deltas, and — unlike the AI-facing
apply_delta() — bypasses cooldown/max_delta_per_turn and lets
milestones be un-set, since this is a deliberate correction rather
than a turn to police. Exposed via PUT /adventures/{id}/world-state
and an edit toggle in the World State drawer. Also fixes the
schema-editor stat-kind dropdown and free-text initial-value input
to size consistently with the numeric fields next to them.

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

backend/tests/test_worldstate_integration.py

@@ -163,6 +163,22 @@ def test_world_state_endpoint(client):
     assert body["state"]["player"]["hp"] == 70
 
 
+def test_override_world_state_endpoint(client):
+    r = client.put(f"/api/adventures/{client.adv_id}/world-state",
+                    json={"player.hp": 5, "flags.alarm": True, "npc.bogus.trust": 1})
+    assert r.status_code == 200, r.text
+    body = r.json()
+    assert body["state"]["player"]["hp"] == 5
+    assert body["state"]["flags"]["alarm"] is True
+    assert body["report"]["rejected"][0]["reason"] == "unknown npc"
+    # persisted to the DB, not just the response.
+    assert _world(client.adv_id)["player"]["hp"] == 5
+
+    # bypasses max_delta_per_turn (30) — a direct correction, not a turn.
+    r = client.put(f"/api/adventures/{client.adv_id}/world-state", json={"player.hp": 100})
+    assert r.json()["state"]["player"]["hp"] == 100
+
+
 def test_undo_reverts_world_state(client):
     _play(client)
     assert _world(client.adv_id)["player"]["hp"] == 70