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]

• #2786
• #2661
• #2851
• #2853 👈 (View in Graphite)
• #2850
• #2847
• #2846 : 1 other dependent PR (#2858 )
• #2844
• main

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[graphite-app[bot]]

Merge activity

• Nov 20, 1:54 AM EST: A user added this pull request to the Graphite merge queue.
• Nov 20, 2:05 AM EST: A user merged this pull request with the Graphite merge queue.