feat(ui): give non-blocking questions their own collapsed style

[Tryanks]

What changes

Non-blocking questions from Codex request_user_input_async (#536) used the blocking question card. That card reads as "the agent is waiting on you", which is wrong for a question the agent works past.

The Codex TUI shows these questions collapsed on arrival, as a one-line "? 1 question" summary that never takes focus, and the user opens them to answer. Tcode now does the same:

• Collapsed by default. A one-line strip above the composer shows an info icon, the "Question from the agent" label, the truncated question, and buttons to expand and hide. Clicking the strip expands it.
• Expanded. A light inline area with the full question, the options as chips, a custom answer field and the "agent keeps working" hint. A chevron collapses it again.
• Blocking questions from Claude, OpenCode, pi and Codex requestUserInput keep the full card unchanged. The non-blocking-only header, hint and hide button are removed from it.

New strings for expanding and collapsing are added in English and Chinese.

Checks run

• cargo fmt --all --check, cargo clippy --workspace --all-targets --locked -- -D warnings, cargo nextest run --workspace --locked: all pass locally on macOS.
• Desktop app with a live Codex session (codex-cli 0.156.1, gpt-6-astra) on a throwaway profile. Light theme at wide width: the strip appears collapsed, expands, and answering with a chip steers the running turn and closes it. Dark theme at narrow width: collapsed and expanded states render, and long questions truncate or wrap cleanly.
• No new unit test: the change is presentation only, and the answer path it drives is covered by the Codex client test from feat(codex): surface non-blocking asks from request_user_input_async #536.