feat: workflow, UI and document support updates

backend/migrations/20260704_01_chat_message_citations.sql

@@ -0,0 +1,19 @@
+do $$
+begin
+  if exists (
+    select 1
+    from information_schema.columns
+    where table_schema = 'public'
+      and table_name = 'chat_messages'
+      and column_name = 'annotations'
+  ) and not exists (
+    select 1
+    from information_schema.columns
+    where table_schema = 'public'
+      and table_name = 'chat_messages'
+      and column_name = 'citations'
+  ) then
+    alter table public.chat_messages
+      rename column annotations to citations;
+  end if;
+end $$;