One thread composer everywhere, and Store categories open again

The chat composer is now one shared surface: @-mentions suggest mesh content as you type on the mobile client too, dictation and hold-to-talk moved into the composer itself, and the separate message bar at the bottom of the mobile app is gone — you write where the thread is.

Store category tiles open their category again. They had quietly stopped navigating on every client, including the web portal: a naming collision made category links land on the wrong page with a technical error. Tapping a category now shows its modules everywhere.

The colorful icons also arrived on mobile: menus, app tiles, and the diagrams inside documentation pages now draw properly on the phone instead of showing blanks or file paths.