[Bug] Kbd and useHotkeys disagree on the combo string vocabulary, so a working shortcut can render the wrong hint

[Astro-Han]

Description

useHotkeys and Kbd take the same '+'-separated combo string, but each keeps its own key vocabulary. useHotkeys resolves aliases through KEY_ALIASES (esc, space, up, down, left, right, return, plus) and accepts mod/ctrl/meta/alt/shift as modifiers. Kbd resolves through KEY_DISPLAY and KEY_LABEL, a different set, and falls back to key.toUpperCase() for anything it does not recognise.

Where the two sets differ, the shortcut works and the hint is wrong:

combo	useHotkeys	Kbd renders
return	fires on Enter	RETURN, not ↵
meta	valid modifier	META
esc	fires on Escape	ESC (the map has escape → Esc)
space	fires on Space	SPACE

Same failure mode as #5253: the handler and the hint disagree, and because the hint looks plausible, nothing reads as broken. #5253 was two copies of one platform check; this is two copies of one key vocabulary.

Suggested direction: one vocabulary both surfaces read, the way isApplePlatform became one detection in #5394.

Reproduction

useHotkeys([{keys: 'return', onPress: doThing}]);  // fires on Enter
<Kbd keys="return" />                              // renders "RETURN"

Same for meta, esc, and space.

Astryx Version

@astryxdesign/core@0.4.7

Environment

Any browser and OS. Not platform dependent.

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Diagnosis and draft prepared with Claude Code; reviewed and verified by the contributor before filing.