fix(docs): normalize sidebar spacing between BaseUI and Radix implementations (#9668)

[ZammadNasir]

Fixes #9668

Summary

The misalignment in the collapsed sidebar was caused by inconsistent spacing between the BaseUI and Radix implementations.

Previously:

• SidebarGroup applied p-2 padding.
• BaseUI wrapped TeamSwitcher in SidebarGroup.
• Radix did not.
• This resulted in layout differences and misalignment in collapsed mode.

Changes

• Removed padding from SidebarGroup to keep it purely structural.
• Moved p-2 spacing to SidebarContent.
• Applied the same changes to both BaseUI and Radix examples for consistency.

Result

• Consistent spacing across BaseUI and Radix implementations.
• Correct alignment in collapsed mode.
• Clear separation of structural and spacing responsibilities.
• Future-proofed behavior if SidebarGroup usage changes.

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