improvement(channels): distinct label for full-history queued by another user

The channel manager already styled the two deep-backfill-pending states
differently (solid clickable chip when you requested full history vs a faint
outline when another subscriber did), but both used the same "full history
queued" label, so a channel queued by someone else looked identical to one you
queued yourself. Give the by-other case its own label ("full history coming")
so the distinction is legible at a glance, not just on hover. Trilingual.

frontend/src/components/Channels.tsx

@@ -444,7 +444,7 @@ function ChannelRow({
             <Tooltip hint={t("channels.row.queuedByOtherHint")}>
               <span className="inline-flex items-center gap-1 text-[10px] px-1.5 py-0.5 rounded-full border border-accent/40 text-accent">
                 <History className="w-3 h-3" />
-                {t("channels.row.fullHistoryQueued")}
+                {t("channels.row.fullHistoryComing")}
               </span>
             </Tooltip>
           ) : (