fix(client): address PR #62 review suggestions — polish pass

- interaction_list.gd: skip queue_redraw() when position unchanged (Tyre #4)
- time_display.tscn: widen bounding rect 154x44→184x54, add clip note
  for #314 wireframe (Tyre #3)
- test_time_display_sprint17.gd: document private state access pattern
  in header (Tyre #5), add upper bound assertion for D-031 1439 max (Hoshe #6)

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

client/ui/interaction_list.gd

@@ -41,10 +41,14 @@ func _ready() -> void:
 	mouse_filter = Control.MOUSE_FILTER_IGNORE
 
 
+var _last_screen_pos: Vector2 = Vector2.ZERO
+
 func _process(_delta: float) -> void:
 	if _showing:
 		_update_screen_position()
-		queue_redraw()
+		if position != _last_screen_pos:
+			_last_screen_pos = position
+			queue_redraw()
 
 
 func _draw() -> void: