Simplify model picker, use default @shadcn/ui components

[cte]

Context

I think we can just use the Command component to its full potential and we don't need a bespoke version of the Combobox.

model-picker.mp4

Implementation

Screenshots

before	after

How to Test

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Important

Simplifies model picker by replacing custom combobox with Command component and updates related UI and tests.

• Model Picker Simplification:
  • Replaces custom Combobox with Command component in ModelPicker.tsx.
  • Removes combobox-primitive.tsx and combobox.tsx files.
• UI Adjustments:
  • Updates button.tsx to adjust outline variant border color.
• Testing:
  • Updates ModelPicker.test.tsx to test new Command component usage.

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