Switch off icon visibility

### User Story Description

As a SAF customer, I want to be able to control if an icon in the bottom tray does not show up. This can be done via either a direct call, or by using the state mechanism to control widget visibility.

### Acceptance Criteria

VISOR can be started with the "full screen" icon not available.

### Additional Links

_No response_

### Requires new or update to third party ? If "yes" add the name(s) and the version(s) of the Third Party Software.

No

### Name and Version for Third Parties

_No response_

首先定位用於渲染全螢幕圖示的底部托盤小工具，以及用於控制小工具可見性的狀態機制。檢查 VISOR 的初始化方式，並確定如何透過直接呼叫或可見性狀態隱藏圖示；當 VISOR 能夠在沒有全螢幕圖示的情況下啟動，同時其餘托盤繼續正常運作時，即表示完成。

由索引模型根據 Issue 內容生成。