feat: NEO sider's toggle button and refactoring

[yomybaby]

Changes:

• Added keyboard shortcut '[' to toggle sidebar collapse state
• Introduced a collapsible button on the sidebar that appears on hover
• Moved sidebar footer content into a more structured layout
• Added useKeyboardShortcut hook to handle keyboard shortcuts when no input is focused
• Refactored BAISider component to use forwardRef and improve layout structure
• Standardized sidebar width constants (COLLAPSED_SIDER_WIDTH = 74, SIDER_WIDTH = 240)
• Removed bottomText prop from BAISider in favor of direct content rendering
• Added hover detection for showing/hiding the collapse toggle button

Testing Requirements:

1. Verify the '[' keyboard shortcut toggles sidebar when no input is focused
2. Check that the collapse button appears on sidebar hover
3. Confirm sidebar footer content displays correctly in both expanded/collapsed states
4. Test that keyboard shortcuts don't trigger when inputs or modals are focused

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[yomybaby]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• feat: WebUI NEO start page basic layout #2786
• chore: use pnpm patch in /react instead of patch-package #2661
• e2e: fix broken tests due to NEO mainlayout, Agent select and Image parsing #2851
• feat: NEO sider's toggle button and refactoring #2853 👈 (View in Graphite)
• feat: Main Layout NEO sider #2850
• feat: Global breadcrumb #2847
• feat: WebUILink and WebUINavigate component #2846 : 1 other dependent PR (#2858 )
• feat: Main layout NEO header #2844
• main

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