The live composer now supports persistent Chat/Chopin modes with Shift+Tab, inline people and document mentions, and recovery states within the composer. Picker popovers share one lighter shadow, and tooltips use sentence case.

Chat defaults to 500px, shrinks to 250px, and grows while keeping 450px for the document. Narrow workspaces show one pane at a time. Touch table menus also recalculate their height when action groups change.

Validation: formatting, lint, design checks, types, focused unit tests, and Chromium coverage for addressing, caret placement, undo/paste, IME, delivery recovery, and responsive layout.