fix(frontend): Missing variable names in plot axis labels

[eatyourgreens]

Leading whitespace in y-axis labels is being displayed as the variable name. This fixes them by trimming the axis names in plot data.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.70%. Comparing base (112f27e) to head (baae9eb).
Report is 3 commits behind head on ui-enhancements.

Additional details and impacted files

@@               Coverage Diff                @@
##           ui-enhancements     #619   +/-   ##
================================================
  Coverage            76.70%   76.70%           
================================================
  Files                  117      117           
  Lines                 5705     5705           
================================================
  Hits                  4376     4376           
  Misses                1329     1329           

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[sonarqubecloud]

Quality Gate passed for 'pkpdapp'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate failed for 'pkpdapp-team_pkpdapp_frontend'

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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