fix(chat): match main timer and task placement

Restore the completed work timer divider and text size from main. Keep todo-list progress in the composer and omit it from web and mobile timeline entries, including completed task lists.

Verified pending, running, and completed task projection; 187 focused web tests and 35 mobile tests pass. Web and mobile typechecks pass.
8dab80cd9cJulius Marminge committed on 9/21/2026, 5:31:41 AMparent22a90e1
7 files changedLine totals unavailable