Three fixes for inline tool hints:
1. Consecutive tool hints now replace the previous one instead of
stacking — the old suffix is stripped before appending the new one.
2. When _resuming flushes the buffer, any trailing tool hint suffix
is removed so it doesn't persist into the next streaming segment.
3. When final _stream_end closes the card, tool hint suffix is
cleaned from the text before the final card update.
Adds 3 regression tests covering all three scenarios.
Made-with: Cursor
Two improvements to Feishu streaming card experience:
1. Handle _resuming in send_delta: when a mid-turn _stream_end arrives
with resuming=True (tool call between segments), flush current text
to the card but keep the buffer alive so subsequent segments append
to the same card instead of creating a new one.
2. Inline tool hints into streaming cards: when a tool hint arrives
while a streaming card is active, append it to the card content
(e.g. "🔧 web_fetch(...)") instead of sending a separate card.
The hint is automatically stripped when the next delta arrives.
Made-with: Cursor
xzq.xuandXubin Ren
