fix: restore font fallback discovery on Linux/Windows#1642
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The terminal render path (rioterm grid_emit::resolve_font) and the UI text path (sugarloaf text) resolved each glyph's font through find_best_font_match, which only consults already-loaded fonts and returns the primary font (font_id 0) on a miss, it never triggers cascade discovery. So on Linux/Windows any codepoint absent from the user's primary font (Nerd Font icons from `ls --icons`, CJK, ...) rendered as the primary font's .notdef tofu.
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The terminal render path (rioterm grid_emit::resolve_font) and the UI text path (sugarloaf text) resolved each glyph's font through find_best_font_match, which only consults already-loaded fonts and returns the primary font (font_id 0) on a miss, it never triggers cascade discovery. So on Linux/Windows any codepoint absent from the user's primary font (Nerd Font icons from
ls --icons, CJK, ...) rendered as the primary font's .notdef tofu.