fix(web): restore ui select public exports

[lyzno1]

Summary

• restore SelectGroup, SelectGroupLabel, and SelectSeparator in the base/ui/select wrapper
• add an alias export spec so these public wrapper exports stay protected from future knip cleanup

Why

base/ui/select is the replacement primitive for legacy select during overlay migration, so its group-related exports should remain part of the public API even if current call sites have not migrated yet.

Validation

• pnpm exec vp test app/components/base/ui/select/__tests__/index.spec.tsx
• pnpm exec knip

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.92%. Comparing base (608958d) to head (9c0e81d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #34501      +/-   ##
==========================================
- Coverage   86.84%   82.92%   -3.92%     
==========================================
  Files        2997     4139    +1142     
  Lines      151441   175008   +23567     
  Branches    29713    36221    +6508     
==========================================
+ Hits       131513   145134   +13621     
- Misses      17150    26999    +9849     
- Partials     2778     2875      +97     

Flag	Coverage Δ
web	83.64% <100.00%> (-0.01%)	⬇️

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