fix: dashboard flaking

[universalmind303]

Summary

the rerun-if-changed was incorrect, so it was always rebuilding, so if you had rust-analyzer or anything else running in the background, it was thrashing the .next directory, causing the flakes.

closes #4049

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.25%. Comparing base (3be3321) to head (6f030a1).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4051      +/-   ##
==========================================
- Coverage   78.45%   78.25%   -0.20%     
==========================================
  Files         783      783              
  Lines      100062    99451     -611     
==========================================
- Hits        78499    77826     -673     
- Misses      21563    21625      +62     

see 10 files with indirect coverage changes

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