fix: resolve transparent bg before inverse swap to prevent invisible text (#45)

Shells like zsh highlight pasted text using reverse video (SGR 7). The
render pipeline makes the default background transparent (None) when it
matches the host terminal background. When inverse swaps fg and bg, the
transparent bg becomes fg=None (Color::Reset), which the host terminal
renders as its default foreground — the same hue as the new bg, making
the text invisible.

Resolve None to the actual terminal background color before swapping so
inverse produces correct contrasting colors.

Fixes ogulcancelik/herdr#44

Co-authored-by: Can Celik <ogulcancelik@gmail.com>

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