feat(desktop): streaming indicator with preparing/streaming/stalled states#3118
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Long agent turns sometimes hang in the middle of streaming — the
provider accepts the request, sends the first 50 tokens, then nothing
for 30+ seconds while it thinks. Today the user sees a frozen bubble
with no signal of what state the request is in; they have to read the
status-bar spinner to guess.
Add StreamingIndicator: a small inline status line that lives under
the in-flight assistant bubble. It's a state machine driven by the
message's text length and a 1Hz heartbeat:
preparing turn started, no text yet
(model warm-up pause, first few seconds)
streaming text deltas arrived within the last 6s
(the normal happy path)
stalled no deltas for >6s while still streaming
(the model is thinking OR the request dropped;
the indicator gives the user a clear signal that
something is happening, not that the app is hung)
The error state (turn_done with e.err) is shown as a separate chip
with a Retry button. The button is currently a no-op stub — the
controller integration needs a ResumeFrom(offset) binding that
re-submits the previous turn's prompt, which is a separate change.
The affordance is rendered so the wiring is a one-line drop-in.
A11y: role=status + aria-live=polite so screen readers announce the
state transitions (a stalled bubble is exactly the kind of event a
screen-reader user would want called out).
prefers-reduced-motion disables the loader spin. The chip re-uses
the existing soft surface / warn / err tokens, so the theme picker
(PR-03) automatically styles it correctly.
HUQIANTAO
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Long agent turns sometimes hang in the middle of streaming. Today the user sees a frozen bubble with no signal of what state the request is in.
Add
StreamingIndicator: a small inline status line that lives under the in-flight assistant bubble. State machine driven by the message's text length and a 1Hz heartbeat:preparingturn started, no text yet (model warm-up pause)streamingtext deltas arrived within the last 6sstalledno deltas for >6s while still streamingerrorturn_done withe.err(with a Retry button)A11y:
role=status+aria-live=politeso screen readers announce the state transitions.