Improve CLI command inline pane and monitoring behavior

- Track user-initiated expansion state to avoid auto-collapse conflicts
- Invert inline action visibility so terminal block hides while inline pane owns the expanded body
- Add scrollable output rendering in requested command expanded view
- Simplify CLI monitor nudge message and extract to reusable method
- Show only latest user query and assistant text in monitor task transcript
- Add handle_ctrl_c_for_conversation to status bar for child agent cancellation
- Update rig_request tests for adjusted monitor nudge wording

app/src/ai/runtime/rig_request_tests.rs

@@ -453,7 +453,7 @@ fn lrc_snapshot_follow_up_uses_the_cli_monitor_prompt_and_tools() {
     assert!(prompt.contains("next assistant output MUST be a tool call"));
     assert!(prompt.contains("alternate screen containing `(END)` is `less`"));
     assert!(prompt.contains("`write_to_long_running_shell_command` with input `q` and mode `raw`"));
-    assert!(prompt.contains("Do not end a still-running monitor turn with prose"));
+    assert!(prompt.contains("The next response must be a tool call, not a progress update"));
     assert!(prepared
         .request
         .tools