yaooqinn opened a new pull request, #54615:
URL: https://github.com/apache/spark/pull/54615

   ### What changes were proposed in this pull request?
   
   Replaces 2 `float: right` CSS declarations in `webui.css` with Bootstrap 5 
`float-end` utility class on the corresponding HTML elements.
   
   **CSS changes:**
   - `a.link`: removed `float: right`
   - `span.expand-details`: removed `float: right`
   
   **Scala changes (4 files, 6 elements):**
   - `MasterPage.scala`: 2 link anchors added `float-end`
   - `AllJobsPage.scala`: 1 link anchor added `float-end`
   - `StageTable.scala`: 1 link anchor + 1 expand-details span added `float-end`
   - `UIUtils.scala`: 1 expand-details span added `float-end`
   
   ### Why are the changes needed?
   
   Aligns with Bootstrap 5 conventions — using utility classes instead of 
custom CSS for layout. Part of SPARK-55760 (Spark Web UI Modernization).
   
   ### Does this PR introduce _any_ user-facing change?
   
   No. Visual appearance is identical.
   
   ### How was this patch tested?
   
   Compilation verified. `float-end` produces the same `float: right 
!important` behavior as the removed CSS rules.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Yes, co-authored with GitHub Copilot.
   


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