Improved chart tooltip

[benvinegar]

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After:

[codecov]

Codecov Report

Attention: Patch coverage is 55.00000% with 18 lines in your changes missing coverage. Please review.

Project coverage is 78.17%. Comparing base (53d5835) to head (7513015).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/components/TimeSeriesChart.tsx	56.75%	16 Missing ⚠️
tailwind.config.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
- Coverage   78.25%   78.17%   -0.09%     
==========================================
  Files          33       33              
  Lines        2419     2442      +23     
  Branches      256      259       +3     
==========================================
+ Hits         1893     1909      +16     
- Misses        518      525       +7     
  Partials        8        8              

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