PromptSearchPanel

Compose the query line, results list, and hint line.

Grab the composed children.

Queue a rebuild that shows the panel for a new query/result set.

The panel is shown by _rebuild_options via call_next, not here, and not at all if that rebuild hits its recovery path -- which hides and abandons the search instead.

Update which row is selected, re-windowing the DOM when needed.

Rows are windowed around the selection, so a move beyond the mounted range rebuilds the window instead of just re-styling a row.

Forward row clicks as this panel's own message for ChatInput.

Move focus to the query input.

Keeps the panel's composition private to it: the owner asks for focus rather than reaching through to _query_input, which is None until on_mount has run.

Hide the panel and cancel any in-flight rebuild.

Show the panel.

Re-report the height once a width is known, or when it changes.

The first show() of a session runs before layout, so it reserves the maximum hint height. This corrects the reservation to the measured one instead of leaving the composer over-shrunk until the next keystroke.

Message sent when the panel's rendered row count changes.

Message sent when a prompt row is clicked in the panel.