Updated UI: Bottom-Fixed Toolbar, Grid-based App Menu, and Layout Enhancements

[DevT75]

Summary:

This PR introduces major UI changes to Chromium, including moving the toolbar to a fixed bottom position, implementing a grid-based app menu using a bottom sheet, and various other layout improvements.

Key Changes:

1. App Menu Layout:

• Modified AppMenu.java and related classed to implement a grid layout using a bottom sheet.
• Updated app_menu_bottom_sheet_layout.xml to support the new grid structure.

2. Toolbar Repositioning:

• Moved the toolbar to a fixed position at the bottom of the screen.
• Updated ToolbarControlContainer and related classes to support the new bottom positioning.

3. General UI Improvements:

• adjusted padding, margins, and layout weights to accommodate the bottom toolbar.

4. Bug Fixes:

• Fixed the bug where, after the keyboard goes out of view whenever something is searched, it leaves a blank patch behind.
• Fixed the bug where a shadow appears under the toolbar.