chore(web): add theming support for components in storybook

[KaWaite]

Overview

Add theming support to components in storybook.
The background still needs to be changed separately..
Updated Modal component's story.

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[codecov]

Codecov Report

Merging #481 (cb2b885) into main (90c38eb) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #481      +/-   ##
==========================================
- Coverage   26.71%   26.70%   -0.02%     
==========================================
  Files        1279     1280       +1     
  Lines      141225   141298      +73     
  Branches     3436     3436              
==========================================
  Hits        37735    37735              
- Misses     102369   102442      +73     
  Partials     1121     1121              

Flag	Coverage Δ
web	24.00% <100.00%> (+<0.01%)	⬆️
web-beta	24.00% <100.00%> (+<0.01%)	⬆️
web-classic	24.00% <100.00%> (+<0.01%)	⬆️
web-utils	24.00% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
web/src/services/theme/index.ts	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes