feat: add popover, dropdown-menu components; update badge, tooltip, s…

[Darkvader-ship-it]

closes #410
closes #411
closes #412
closes #413

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Dropdown Menu Component – Summary

All checks pass.
packages/ui/src/components/dropdown-menu.tsx — New component with 11 exported parts:

Part	Description
DropdownMenu	Root element (non-modal, keyboard nav, typeahead built in)
DropdownMenuTrigger	Button that opens the menu
DropdownMenuContent	Portal + Positioner + Popup, uses bg-popover/shadow-md overlay surface, collision-aware positioning
DropdownMenuItem	Interactive item with destructive prop — visually distinct via text-destructive/bg-destructive/10 on highlight, not selected by default
DropdownMenuCheckboxItem	Toggle item with checkmark indicator (CheckmarkCircle01Icon)
DropdownMenuRadioGroup	Groups radio items with value/onValueChange
DropdownMenuRadioItem	Radio item with RadioButtonIcon indicator
DropdownMenuGroup	Wrapper for related items
DropdownMenuGroupLabel	Accessible group label
DropdownMenuSeparator	Visual separator
DropdownMenuShortcut	Keyboard shortcut hint (<span> with ml-auto right alignment)

Key Behaviors (covered by Base UI Menu)

• Full keyboard navigation (arrow keys, Enter, Escape) and typeahead via label prop
• Destructive items visually distinct but not default
• Nested content not included (per spec)

Tests

• 14 tests covering:
  • All exports
  • Item variants (destructive, disabled)
  • Checkbox (checked/unchecked)
  • Radio group selection
  • Positioning

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