slab/menuband: localization scaffold + hover-link chips + tighter voice pill
- Localization.swift adds plug-and-play L("key") with English + Spanish tables; popover rebuilds on language change.
- HoverLinkButton paints a real link/chip (idle + hover fill/border, pointing-hand cursor) for the Why-this-Keymap and brand badges.
- Music-note pill in KeyboardIconRenderer now hugs the actual digits of voiceNumber instead of reserving a fixed 12pt pad.
- viewDidChangeEffectiveAppearance re-resolves the popover background so light/dark toggles repaint cleanly.
- Bundles keymaps-social-software-26-arxiv.pdf as a resource for the Why-this-Keymap chip.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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