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/app/worldstate/__init__.py

@@ -4,6 +4,7 @@ module validates and clamps them against a scenario's stat_schema."""
 from .engine import (
     EMIT_RULE,
     apply_delta,
+    apply_override,
     band_label,
     extract_delta,
     has_schema,
@@ -17,6 +18,7 @@ from .engine import (
 __all__ = [
     "EMIT_RULE",
     "apply_delta",
+    "apply_override",
     "band_label",
     "extract_delta",
     "has_schema",