clean up top nav

[Mbeaulne]

Description

Redesigned the top navigation bar to use icon buttons instead of text buttons, creating a more compact and consistent UI. The changes include:

• Converted "New Pipeline", "Import Pipeline", and "Backend Status" buttons to icon buttons with tooltips
• Added the Clone Pipeline button to the top navigation when viewing a pipeline run
• Improved the styling of buttons to use ghost variant with white text and hover effects
• Removed the mobile hamburger menu in favor of a unified approach across device sizes

Type of Change

• Bug fix
• New feature
• Improvement
• Cleanup/Refactor
• Breaking change
• Documentation update

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Test Instructions

1. Verify that all top navigation buttons work correctly
2. Check that the Clone Pipeline button appears when viewing a pipeline run
3. Test the responsiveness of the navigation bar on different screen sizes
4. Confirm tooltips display correctly when hovering over icon buttons

[Mbeaulne]

• clean up top nav #1678 👈 (View in Graphite)
• master

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