Keyboard shortcuts lacking on iPad

When using a Bluetooth keyboard, it's a pain not being able to re-use muscle memory from other platforms (e.g. Ctrl/CMD+K to search for rooms), harming productivity.

No file, test, or entry point is named. Start by locating the iPad Bluetooth-keyboard handling and existing shortcut definitions, then determine which platform shortcuts are supported and how the requested room-search shortcut should behave. Done means the agreed shortcuts work reliably on iPad with a Bluetooth keyboard.

Written by the indexing model from the issue text.