feat: Nerd Font glyph support#1

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SuaveIV wants to merge 3 commits intofdncred:masterfrom

SuaveIV:nerd_font_support

Commits on Mar 5, 2026

feat: register system Nerd Font as gpui fallback for glyph rendering
SuaveIV
committed
docs: update README to include Nerd Font support and installation instructions
SuaveIV
committed

Commits on Mar 6, 2026

refactor: detect Nerd Font via OS font system instead of filesystem scanning
SuaveIV
committed