feat: extend dark mode to entire Storybook UI

[acd02]

Description, Motivation and Context

Currently, we have implemented dark mode support only within individual stories in Storybook.

However, this can create inconsistencies in the user interface, where some parts are in dark mode while others remain in light mode.

We would like to extend the dark mode functionality to cover the entire Storybook UI (the whole page) to provide a consistent user experience.

Types of changes

• 🛠️ Tool
• 🪲 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 🧾 Documentation
• 📷 Demo
• 🧪 Test
• 🧠 Refactor
• 💄 Styles

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (6712d4c) to head (53ca89d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2492   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files         515      515           
  Lines        4377     4377           
  Branches     1409     1409           
=======================================
  Hits         4211     4211           
  Misses        162      162           
  Partials        4        4           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.