Prevent layout shift with intermediate values plot

[not522]

Contributor License Agreement

This repository (optuna-dashboard) and Goptuna share common code.
This pull request may therefore be ported to Goptuna.
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• I agree this patch may be ported to Goptuna by other Goptuna contributors.

Reference Issues/PRs

What does this implement/fix? Explain your changes.

The layout shift is occurring because the decision to display the plot of intermediate values is made during loading. This PR prevents the shift by replacing the plot last.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (9e314a9) 67.20% compared to head (885da8f) 67.20%.
Report is 22 commits behind head on main.

Files	Patch %	Lines
optuna_dashboard/_app.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #726   +/-   ##
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  Coverage   67.20%   67.20%           
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  Files          35       35           
  Lines        2293     2293           
=======================================
  Hits         1541     1541           
  Misses        752      752           

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