Add swap button for version selectors in Compare Versions

[aas008]

Summary

• Adds a ⇄ swap button between Version 1 (Baseline) and Version 2 (Comparison) dropdowns in the Compare Versions section
• Clicking the button swaps the two selected versions instantly via session state

Closes #49

Test plan

• Open Compare Versions, select two versions, click ⇄ — versions swap
• Verify the swap button aligns vertically with the dropdowns
• Verify GPU and Profile selectors are unaffected

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 7100702 and 1a5b326.

📒 Files selected for processing (1)

• dashboard.py

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Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@7100702). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
dashboard.py	0.00%	10 Missing ⚠️
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Additional details and impacted files

@@          Coverage Diff           @@
##             main     #75   +/-   ##
======================================
  Coverage        ?   3.46%           
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  Files           ?       8           
  Lines           ?    8378           
  Branches        ?       0           
======================================
  Hits            ?     290           
  Misses          ?    8088           
  Partials        ?       0           

Flag	Coverage Δ
unittests	3.46% <0.00%> (?)

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