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ARP had zero treatment until now - its ethertype just fell through
summarize_packet's "not IPv4/IPv6" branch, on traffic that appears on
essentially every real LAN capture. Scoped to Ethernet/IPv4 addressing
(the case that covers virtually all real ARP traffic), with tcpdump's
own "who-has X tell Y" / "X is-at Y" phrasing rather than inventing
new wording. Live-verified by flushing this machine's real gateway
ARP entry and capturing the resulting request/reply on wlp1s0.
TUI -c/-a were being parsed into RenderOptions but silently did
nothing: run_tui()'s consumer thread had its own loop that never read
them, unlike plain-text mode's render_packet(). Fixed to match, and
caught a real bug while doing it - pushing up to two rows per packet
(summary + reassembly line) against a single pop_front() would let
the row deque grow past its cap under sustained -a activity; needed a
while loop instead. Verified under tmux against the same split-segment
HTTP scenario used to verify -a on the CLI and GUI.
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