fix: move sidebar toggle button up to avoid OS taskbar overlap

[VaishnaviBardapure]

Summary

This PR fixes the sidebar toggle button becoming unclickable when the OS taskbar auto-hides and pops up over the sidebar, by adding a 40px bottom margine to push the toggle controls up from the bottom edge.

Related Issue

Fixes #1287

Changes

• Added 'marginBottom: '40px' to the Box containing sidebarToggleButton in both the Home sidebar and regular sidebar layouts in Sidebar.tsx
• Updated storybook snapshots to reflect the new spacing

Steps to Test

1. Enable Windows taskbar auto-hide (Taskbar settings -> Taskbar behaviors -> Automatically hide the taskbar).
2. Open Headlamp and let the taskbar pop up (move mouse to bottom of screen or trigger a notification).
3. Verify the sidebar toggle button is now visible and clickable, no longer behind the taskbar.

Screenshots (if applicable)

• Before :
• After:

Notes for the Reviewer

-This is a minimal CSS fix that adds spacing without changing any sidebar functionality. All existing tests pass with updated snapshots reflecting the new layout.

[kubernetes-prow]

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• ✅ login: VaishnaviBardapure / name: VaishnaviBardapure (fc5d63c)

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[skoeva]

closing this - the taskbar overlapping app windows is an os issue, not something we need to work around with hardcoded padding