fix: add missing @/styles alias to Storybook webpack config

[Mir-Zairan]

Summary

The @/styles path alias was missing from the manually defined aliases in .storybook/main.js. This caused a SassError: Can't find stylesheet to import when Storybook tried to compile any component whose SCSS module uses @use '@/styles/constants' or @use '@/styles/breakpoints' (e.g. Button, Sorter), making those stories fail to render entirely.

The existing comment in the file already acknowledges that @/ aliases must be defined manually in Storybook — @/styles was simply omitted from the list.

Closes: N/A

Type of Change

• 🐛 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 update
• ♻️ Refactoring (no functional changes)

Scope Confirmation

• This PR addresses one feature/fix only
• If multiple changes were needed, they are split into separate PRs

Rollback Safety

• Can be safely reverted without data issues or migrations

Test Plan

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed

Testing steps:

1. Run yarn storybook
2. Navigate to any story that uses Button or Sorter components
3. Confirm no SassError: Can't find stylesheet to import error appears
4. Confirm the components render correctly

Edge Cases Verified

• ⏳ Loading state handled
• ❌ Error state handled
• 📭 Empty state handled

Pre-Review Checklist

Code Quality

• I have performed a self-review of my code (file by file)
• My code follows the project style guidelines
• No unused code, imports, or dead code included

Testing & Validation

• Linting passes (yarn lint)

Accessibility (if UI changes)

N/A — configuration change only

Screenshots/Videos

N/A — no visual changes, this is a Storybook configuration fix

AI Assistance Disclosure

• AI tools were NOT used for this PR
• AI tools were used, and I have thoroughly reviewed and validated all generated code