Renders the author search box, the search results table, and the
multi-step add confirmation prompt with its five dropdown popups.
The prompt's per-field highlighting is conveyed purely by style, which
render_to_string_with_app discards, so the highlight mapping is extracted
into add_author_prompt_highlights and unit tested per selection step.
Enriches the fully populated author search fixture with a second result
that is absent from the library, so both branches of the in-library
marker render in one snapshot and every table column carries a value.
Dark-Alex-17
7d1ff86c68