feat: implement pause menu with loadout, settings, and input rebinding support

ui/pause_menu.gd

@@ -271,14 +271,16 @@ func _build_ui() -> void:
 	var user_save = Button.new()
 	user_save.text = "Save"
 	user_save.pressed.connect(func():
-		SettingsManager.username = user_input.text
+		var final_name = user_input.text.strip_edges()
+		user_input.text = final_name
+		SettingsManager.username = final_name
 		SettingsManager._save_settings()
 		var nm = get_node_or_null("/root/NetworkManager")
 		if nm:
 			if nm.multiplayer.has_multiplayer_peer() and not nm.multiplayer.multiplayer_peer is OfflineMultiplayerPeer:
-				nm.update_username.rpc_id(1, user_input.text)
+				nm.update_username.rpc_id(1, final_name)
 			else:
-				nm.update_username(user_input.text)
+				nm.update_username(final_name)
 	)
 	user_hbox.add_child(user_save)
 	
@@ -920,7 +922,9 @@ func _populate_options(opt: OptionButton, category: String, current_id: String)
 func _save_current_loadout() -> void:
 	if editing_index >= 0 and editing_index < LoadoutManager.loadouts.size():
 		var l = LoadoutManager.loadouts[editing_index]
-		l["name"] = name_edit.text
+		if name_edit.text.strip_edges() != "":
+			l["name"] = name_edit.text.strip_edges()
+			name_edit.text = l["name"]
 		l["primary_1"] = primary1_opt.get_item_metadata(primary1_opt.get_selected_id())
 		l["primary_2"] = primary2_opt.get_item_metadata(primary2_opt.get_selected_id())
 		l["special"] = special_opt.get_item_metadata(special_opt.get_selected_id())