The /model slash command's fuzzy fallback used a substring match that
took the first option containing the query, so "/model mimo-v2.5"
selected "mimo-v2.5-pro" instead of "mimo-v2.5".
Replace both fallback loops with a shared _bestModelMatch helper that
prefers an exact id/label match and otherwise returns the shortest
option containing the query, so a more specific query is no longer
shadowed by a longer variant. The longer variant is still selectable by
querying its full name.
Closes#3368
Vanshaj Pahwa
0ea5e4ef69
