Updated bottom menu

<img width="2306" height="836" alt="Image" src="https://github.com/user-attachments/assets/4e544e75-439c-4294-bfa7-458151b88b37" />

To harmonize LaSuite, move the “My Account” menu and the app switcher to the bottom left of the sidebar. This also aligns the mobile and desktop views.

[FIGMA](https://www.figma.com/design/yRwtsK2JBGwsshASRqW9c4/L-Assistant?node-id=16402-18528&t=MJAyw3chLdxAzmNx-1)
