feat(feedback): add responsive camera and impacts

Game/scripts/game_mode.gd

@@ -17,6 +17,9 @@ var hud: HUDController
 var ball: RigidBody3D
 var ships: Array[Ship] = []
 var _ship_spawn_transforms := {}
+var _hit_stop_generation := 0
+var _hit_stop_active := false
+var _time_scale_before_hit_stop := 1.0
 
 # Shared by modes that keep score (Match, Spectate); Free Play never
 # references this or emits a score_changed signal, and HUDController relies
@@ -102,6 +105,7 @@ func spawn_camera_rig(target: Ship) -> ShipCameraRig:
 	var rig: ShipCameraRig = CAMERA_RIG_SCENE.instantiate()
 	add_child(rig)
 	rig.target = target
+	rig.impact_feedback.connect(_on_player_impact)
 	# Also wires the scene's static HUD (if any) to the same ship, rather
 	# than letting it guess via the "ship" group.
 	if hud:
@@ -109,6 +113,40 @@ func spawn_camera_rig(target: Ship) -> ShipCameraRig:
 	return rig
 
 
+func _on_player_impact(intensity: float) -> void:
+	if hud:
+		hud.flash_impact(intensity)
+	_run_hit_stop(intensity)
+
+
+func _run_hit_stop(intensity: float) -> void:
+	_hit_stop_generation += 1
+	var generation := _hit_stop_generation
+	if not _hit_stop_active:
+		_time_scale_before_hit_stop = Engine.time_scale
+		_hit_stop_active = true
+	Engine.time_scale = minf(
+		Engine.time_scale, lerpf(0.22, 0.06, clampf(intensity, 0.0, 1.0))
+	)
+	await get_tree().create_timer(
+		lerpf(0.025, 0.065, clampf(intensity, 0.0, 1.0)), true, false, true
+	).timeout
+	if generation == _hit_stop_generation:
+		_restore_hit_stop()
+
+
+func _restore_hit_stop() -> void:
+	if not _hit_stop_active:
+		return
+	Engine.time_scale = _time_scale_before_hit_stop
+	_hit_stop_active = false
+
+
+func _exit_tree() -> void:
+	# A scene change during the unscaled timer must never strand global time.
+	_restore_hit_stop()
+
+
 # Given an already-resolved (path, reaction_ticks, action_noise) — callers
 # apply their own GameSettings-override logic first, which differs between
 # modes (Match lets GameSettings override all three fields, Spectate only