flesh out the Claude prompt UX: options, stepper, collapse

Builds on the in-composer prompt surface (D-78):

- Permission prompts (T-175): Allow / Allow-and-don't-ask-again / Deny.
  "Don't ask again" appears only when the request carries a
  permission_suggestion and echoes it back as updatedPermissions. An
  optional note rides Deny as the message, or Allow as a follow-up user
  message (the protocol has no allow-with-message).
- AskUserQuestion picker (T-176): a single question renders bare; 2-4
  questions step one at a time (nav shows "N · Header", ✓ when answered)
  then a review/confirm screen. Each question offers an "Other" free-text
  choice and a per-choice note; multi-select joins labels. A "chat
  instead" escape denies the prompt so the user can type freely. On
  submit the answer is echoed into the log, since the card is ephemeral.
- Collapsed tool cards (T-177): multi-line tool_use / tool_result start
  collapsed behind a one-line summary; one-line output renders inline.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -18,14 +18,19 @@ heading, and (b) bumping `pubspec.yaml` `version:` in the same commit.
 
 ### Added
 
-- Native permission & AskUserQuestion prompts (T-166, D-78) — when Claude
-  needs tool approval or asks a question, an inline card appears in the
-  conversation with Allow/Deny or selectable options; the decision is
-  returned over the stream-json control channel. Closes the prompt gap
-  the tmux model couldn't surface.
+- Native permission & AskUserQuestion prompts (T-166, T-175, T-176, D-78) —
+  when Claude needs tool approval or asks a question, the composer is
+  replaced by a prompt: Allow / Allow-and-don't-ask-again / Deny for
+  permissions (with an optional note), and a single-question or
+  stepped-with-review option picker for AskUserQuestion (with "Other"
+  free-text and per-choice notes). Closes the prompt gap the tmux model
+  couldn't surface.
 - Conversation message cards (T-173) — every turn in the Claude pane now
   renders through one card template with a copy button on hover and a
   collapse/expand caret for tool calls, results, and thinking.
+- Collapsed-by-default tool cards (T-177) — multi-line tool calls and
+  results start collapsed behind a one-line summary; one-line output stays
+  inline so a caret never hides a single line.
 - Claude meta sidebar (T-141, T-157) — an always-pickable left-panel tab
   showing Claude activity (the latest day's messages/sessions/tool-calls
   plus lifetime totals, from `stats-cache.json`) and, when a tmux team is