fix: import components styles in App scss

[artemmufazalov]

I have a bug with the drawer when I use embedded ui as a package in dev mode.

The reason - drawer styles are in index.scss, which is not imported in other versions, because it has different fonts and forwards theme, that sometimes is not needed.

I moved drawer styles to a separate file, imported drawer, versions and unipika styles inside App.scss, so they are always imported and I don't need to import them manually. I didn't changed import of illustrations, assuming they may have different styles in different installations

CI Results

Test Status: ⚠️ FLAKY

📊 Full Report

Total	Passed	Failed	Flaky	Skipped
378	374	0	2	2

Test Changes Summary ⏭️2

⏭️ Skipped Tests (2)

1. Scroll to row, get shareable link, navigate to URL and verify row is scrolled into view (tenant/diagnostics/tabs/queries.test.ts)
2. Copy result button copies to clipboard (tenant/queryEditor/queryEditor.test.ts)

Bundle Size: ✅

Current: 85.37 MB | Main: 85.37 MB
Diff: +0.11 KB (0.00%)

✅ Bundle size unchanged.

ℹ️ CI Information

• Test recordings for failed tests are available in the full report.
• Bundle size is measured for the entire 'dist' directory.
• 📊 indicates links to detailed reports.
• 🔺 indicates increase, 🔽 decrease, and ✅ no change in bundle size.