fix(client): address PR review warnings — field guard + public API rename

- main.gd: add has("entity_id") guard to _play_recognition_chimes()
  (matches defensive pattern in _play_close_sound_events and update_sound_events)
- sound_indicator_renderer.gd: rename _color_for_type → color_for_type
  (public testable API, not an internal-only method)
- test_rendering.gd: update test calls to match rename

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/scripts/main.gd

@@ -220,6 +220,8 @@ func _play_close_sound_events() -> void:
 func _play_recognition_chimes() -> void:
 	var active_ids: Dictionary = {}
 	for rec in GameState.pending_recognitions:
+		if not rec is Dictionary or not rec.has("entity_id"):
+			continue
 		var eid: int = rec.entity_id
 		active_ids[eid] = true
 		if not _known_recognition_ids.has(eid):