Support multi-model selection in Pareto Tradeoff Analysis

[aas008]

Summary

• Changes the Pareto Tradeoff Analysis model selector from single-select (st.selectbox) to multi-select (st.multiselect)
• Users can now overlay Pareto curves for multiple models on the same chart for cross-model comparison
• Traces are grouped by model + version + accelerator + parallelism config
• Model name appears in legend, hover text, and plot title when multiple models are selected
• When only one model is selected, the UI behaves identically to before (no model prefix in legend)

Closes #64

Test plan

• Select a single model — verify chart looks identical to before
• Select multiple models — verify each model gets distinct traces with model name in legend
• Hover over a data point — verify model name appears in tooltip
• Verify plot title shows comma-separated model names when multiple selected
• Verify "Please select at least one model" warning when none selected

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Reviewing files that changed from the base of the PR and between 7100702 and 3a95aa4.

📒 Files selected for processing (1)

• dashboard.py

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Codecov Report

❌ Patch coverage is 0% with 56 lines in your changes missing coverage. Please review.
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Files with missing lines	Patch %	Lines
dashboard.py	0.00%	56 Missing ⚠️
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@@          Coverage Diff           @@
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  Files           ?       8           
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  Hits            ?     290           
  Misses          ?    8092           
  Partials        ?       0           

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