refactor(tokenselector): 3 - streamline token search results

[fairlighteth]

Summary

Virtualizes the token search results as outlined in the selector split plan: the “Can’t find your token?” banner now lives inside the scrollable list, rows are rendered through VirtualList, and import sections share the new spacing props so only the visible subset of tokens (or import entries) are hydrated at any time.

To Test

1. General search flow

   • Open the token selector, type a search term with many matches, and scroll; the banner should stay pinned to the list and rendering should feel smooth.
   • Switch search terms rapidly—verify the list snaps back to the top and doesn’t flash duplicates.

2. Import sections

   • Search for an address so blockchain/inactive/external sections appear; confirm section headers render once and each block has the expected top/bottom padding.
   • Use the “Import” buttons to ensure IDs/handlers still work.

3. Bridge context

   • With bridging enabled (pre-filtered tokens), confirm search results still render and virtualization doesn’t break the filtered list.

Background

Part of the ongoing token-selector breakdown, focusing on the search results virtualization and import-section styling tweaks needed before we layer in recents/favorites.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/token-selector-3

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