Convert caelestia's nexus Settings to Nerd Font icons (drop-in NsIcon).
- NsIcon hardened into a MaterialIcon drop-in: accepts fontStyle (sizes from
it, keeps the NF Mono family), plus no-op fill/grade/animate for API parity.
- Glyphs map extended with caelestia core names: nexus static icons, nav/page
icons (palette, wallpaper, dashboard, devices_other, extension, globe, info,
monitor, shuffle, workspaces, ...), weather + app/device icons.
- Converted all MaterialIcon in modules/nexus/ to NsIcon; fixed icon aliases
(NavRow/SliderRow .text -> .icon); reverted IconButton font: (it has font,
not fontStyle, and renders its own icon).
Remaining core surfaces still Material Symbols (no breakage): launcher, osd,
lock, sidebar, utilities — to convert next with any further Glyphs entries.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
