feat(goals): add cinematic celebration sequence

Game/scripts/match_mode.gd

@@ -37,6 +37,8 @@ var match_timer: Timer
 var _in_overtime := false
 var _match_over := false
 var _last_timer_remaining := -1
+var _pending_scoring_team := -1
+var _match_time_after_goal := -1.0
 
 
 func _get_arena_scene_path() -> String:
@@ -79,16 +81,32 @@ func _process(_delta):
 			timer_updated.emit(floori(remaining / 60.0), remaining % 60)
 
 
-func _on_goal_scored(conceding_team: int) -> void:
+func _on_goal_registered(conceding_team: int) -> void:
 	if _match_over:
 		return
-	var scoring_team := 1 - conceding_team
-	_record_goal(scoring_team)
+	_pending_scoring_team = 1 - conceding_team
+	_record_goal(_pending_scoring_team)
 	score_changed.emit(score.duplicate())
+	# Commit the score and freeze regulation time at sensor entry. The clock
+	# resumes after the cinematic, so a last-second goal cannot be discarded or
+	# reclassified as overtime while presentation is still running.
+	if match_timer and match_timer.time_left > 0.0:
+		_match_time_after_goal = match_timer.time_left
+		match_timer.stop()
+
+
+func _on_goal_scored(_conceding_team: int) -> void:
+	if _match_over or _pending_scoring_team < 0:
+		return
+	var scoring_team := _pending_scoring_team
+	_pending_scoring_team = -1
 	if _in_overtime:
 		# Golden goal: the first score after a draw ends the match outright.
 		_end_match(scoring_team)
 		return
+	if match_timer and _match_time_after_goal > 0.0:
+		match_timer.start(_match_time_after_goal)
+		_match_time_after_goal = -1.0
 	await _run_kickoff_countdown()