Render interactive question UI for ACP agent tool calls

[igenabhishek]

What are you proposing?

When an ACP agent (like Kilo Code or OpenCode) uses a "question" tool to ask the user for input, Zed should render the question and options as interactive, clickable UI elements rather than leaving the session stuck.

Why does this matter?

Currently, when an ACP agent tries to ask a question, the session hangs indefinitely. The user sees no interactive options and can only kill the session. This blocks workflows where the agent needs user clarification or confirmation.

This was previously reported in issue #48038 for OpenCode, and while OpenCode worked around it by disabling the question tool under Zed, the root cause remains: Zed's ACP integration doesn't support rendering interactive question UI.

Are there any examples or context?

• Original issue: ACP integration doesn't handle "question" tool_call properly #48038
• In terminal-based agents (OpenCode TUI, Claude Code), questions render as selectable options the user can click/type
• Other editors with ACP support could serve as reference for how to render interactive tool call results

Possible approach

Detect tool_call updates with a question or AskUserQuestion kind and render them as interactive prompts with clickable option buttons, similar to how approval prompts work in Zed.