fix(web): hold the WS pill's queued-bytes suffix until a backlog persists

A paste, an IME commit or a fast word sits above the 4-byte hint threshold for a few
milliseconds until its ACK lands, and each one widened the header pill (`WS · 12B queued`) and
moved the gauges beside it. The suffix now appears only after the backlog has stayed above the
threshold for 1.2s; a drain forgets the burst and a timer re-renders when the hold elapses.

.changeset/4cecc61b.md

@@ -0,0 +1,5 @@
+---
+"aicodeman": patch
+---
+
+Header connection pill: the " · NB queued" suffix on `WS` now appears only after a backlog has stayed above the threshold for over a second, instead of flashing on every paste, IME commit or fast burst that ACKs a moment later.