showTypingIndicator treated any tool part in the latest assistant message
as visible content, so the "AI is typing…" dots were suppressed for the
rest of the turn once the first tool call appeared. During the model's
"thinking" pauses after a completed tool call, the chat showed only static
tool cards and no activity.
Inspect the last part of the assistant message instead of any part: hide
the dots only while output is actively rendering (a non-empty streaming
text part, or a tool still in the "running" state — which shows its own
Loader). Finished/errored tools and empty trailing text now keep the dots
visible, so the indicator reappears while the model thinks between steps.
Add tests covering the post-tool thinking gap and the running-tool case.
79c3c86b82