More theme fixes for select, dropdown & command

[cte]

Context

I found a few themes where we need vscode-list-activeSelectionForeground.

Implementation

Screenshots

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How to Test

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Important

Updated VSCode theme for select, dropdown, and command components, including CSS and component refactoring for consistent styling.

• Theme Updates:
  • Updated ModelPicker.tsx, select-dropdown.tsx, and dropdown-menu.tsx to use vscode-list-activeSelectionForeground for active selections.
  • Adjusted CSS classes in autosize-textarea.tsx, button.tsx, and command.tsx for consistent styling.
  • Modified index.css to include --color-vscode-list-activeSelectionForeground.
• Component Changes:
  • Changed Button variant to combobox in ModelPicker.tsx.
  • Removed DropdownMenuSub and related components from dropdown-menu.tsx.
• Testing:
  • Updated select-dropdown.test.tsx to reflect changes in dropdown item rendering and selection logic.

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🦋 Changeset detected

Latest commit: 84dd8a5

The changes in this PR will be included in the next version bump.

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roo-cline	Patch

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