refactor(theme-studio): dedup the palette harvest and color-pair walks

generate.py's add_default_palette_colors repeated the same fg/bg/box-color harvest three times (syntax, ui, package faces); it now calls one _harvest_spec_colors helper, preserving the add order so the palette and generated page are byte-identical. default_faces' _build_color_hex and _build_color_names each walked the same faces -> chosen/effective -> foreground/background/distantForeground nesting; both now consume one _iter_color_pairs generator and only differ in their key choice and filter. The rebuilt color maps match the originals exactly.

I left the lower-value generate.py items (a build() wrapper, dict-driven fill_data) and the capture/face-coverage script dedups for later: they touch import-time behavior or scripts the suite doesn't run, so they want their own verification rather than riding this change.

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