feat(frontend): add rolling median trend to sitespeed charts

[M-arcus]

No description provided.

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Adds rolling median trend line to performance charts.

The PR appears safe to merge.

Summary

Adds optional seven-run rolling median lines to sitespeed charts, with localized labels and tests for timespan history, hidden runs, missing measurements, and zero transfer sizes.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Site speed runs] --> B[Exclude hidden runs]
  B --> C[Seven-run rolling median]
  B --> D[Filter to selected timespan]
  C --> E[Median chart lines]
  D --> F[Raw chart lines]

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_{Reviews (2) · Last reviewed commit: "fix(frontend): count zero transfer size ..."}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
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  Coverage        ?   39.30%           
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  Files           ?      326           
  Lines           ?    20199           
  Branches        ?      912           
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  Hits            ?     7939           
  Misses          ?    12239           
  Partials        ?       21           

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