Ultracompact Mode (search-only)

[philtweir]

What does this PR do?

Adds an ultracompact mode only for search (interactive.rs) and not the inspector.

• adds a config parameter to set a line height at which to switch to ultracompact
• introduces a simplified inspector tab, with only previous-current-next commands as rows, in compact mode
• allows navigation through session history within the inspector (so compact inspector view is still useful)
• in ultracompact view, compresses indicator row into prompt, removes any non-command lines (except help if show_help is true)

TODO

• additional tests, although keen for input on how best to do these
• documentation (once configuration/semantics are aligned on)

Checks

• I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle
• I have checked that there are no existing pull requests for the same thing

[ellie]

sorry for being slow here, had a tonne on lately - haven't forgotten this and will get to reviewing it soon 🙏

[philtweir]

Thanks, no worries @ellie !