The mesh page's arrivals showed a fixed 16-cell lane — six stored
bytes and blank padding, however wide the terminal. The lane now
absorbs whatever width the name lane and the FIRST HEARD tail leave
(floored at the old width), and each arrival's key expands to its
fullest known form the way the picker's lane does: the key captured
with an observation, else the device's contact list, else the stored
12-hex prefix — as many whole bytes as fit, ellipsized on a byte
boundary. The column header reads KEY, per the lexicon.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>