refactor(frontend): buttons on react-aria Button

[Kadrian]

Design-system prep, step 3: buttons on react-aria's Button

Stacked on #4000. BasicButton renders react-aria-components' Button, so every button built on it is the trigger that TooltipTrigger, MenuTrigger and friends expect, with no wrappers or hook wiring of our own.

• call sites unchanged: disabled maps to isDisabled, onClick is react-aria's alias for onPress and keeps its mouse event
• react-aria's Button forwards only the DOM attributes it knows: title dropped at five buttons that had a label or tooltip anyway, tabIndex={-1} → excludeFromTabOrder at three, aria-hidden → aria-label at one
• press semantics on all buttons: click events stop at the button, focus on press, no text selection while pressing. The explicit stopPropagation calls are redundant now but harmless

data-hovered, data-pressed, data-focus-visible and isPending become available for the Button rework.