- Add DropdownTrigger and ComboboxTrigger with an overridable chevron slot and a 1 px translateY caret nudge for consistent vertical alignment.
- Convert text-based dropdown/combobox triggers across model selector, agent controls, mode control, settings, and new workspace to use the shared components.
- Lay out New Workspace arguments horizontally on desktop without labels while keeping the mobile vertical stack; align the project icon left edge with the title.
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