* fix(chat): meter flashes stale window on mid-chat model swap (issue #817)
session.info updates the model label as soon as the backend applies a
swap, but the context meter's denominator kept the old model's window
until the next fetch — the chip briefly rendered the new label over the
old window (e.g. 1M flashing before settling on 262k).
- session.info with a DIFFERENT model now blanks the denominator (chip
hides while resolving) and immediately re-fires fetchContextUsage()
- fetchContextUsage writes the denominator ONCE, atomically: RPC
context_max wins, REST model/info is the fallback — a stale pre-swap
response can never override a fresh one
- regression tests: swap re-fires the fetch and lands the new window;
an identical session.info leaves the meter untouched
* fix(chat): don't fall back to profile REST window on model swap (issue #817)
After a session-scoped swap the live agent's context_breakdown can
return empty (context_max 0) while the runtime warms up. The refetch
then fell back to GET /api/model/info — PROFILE-scoped — which reports
the profile's main-model window (e.g. 1M), resurrecting the stale
window under the new label. The swap-triggered refetch now trusts only
the RPC's live context_max; the chip stays hidden until the real
window lands.
---------
Co-authored-by: M57 <hy4ri@users.noreply.github.com>
