feat(frontend): streamline task creation and preview workflows

- remove prompt and preview generation from task creation

- create tasks as inactive and route directly to edit page

- add generated message history UX to edit task

- update entity/task views and related test coverage

frontend/src/pages/EntitiesPage.tsx

@@ -8,25 +8,29 @@ import {
   VirtualEntityCreateDto,
 } from '../api/entitiesApi'
 
+const DEFAULT_CONTEXT_WINDOW_DAYS = 3
+
+const initialFormState: VirtualEntityCreateDto = {
+  name: '',
+  email: '',
+  jobTitle: '',
+  personality: '',
+  contextWindowDays: DEFAULT_CONTEXT_WINDOW_DAYS,
+}
+
 export default function EntitiesPage() {
   const navigate = useNavigate()
   const queryClient = useQueryClient()
   const { data: entities = [] } = useQuery({ queryKey: ['entities'], queryFn: getEntities })
   const [dialogOpen, setDialogOpen] = useState(false)
-  const [form, setForm] = useState<VirtualEntityCreateDto>({
-    name: '',
-    email: '',
-    jobTitle: '',
-    personality: '',
-    contextWindowDays: 3,
-  })
+  const [form, setForm] = useState<VirtualEntityCreateDto>(initialFormState)
 
   const createMutation = useMutation({
     mutationFn: createEntity,
     onSuccess: (createdEntity) => {
       queryClient.invalidateQueries({ queryKey: ['entities'] })
       setDialogOpen(false)
-      setForm({ name: '', email: '', jobTitle: '', personality: '', contextWindowDays: 3 })
+      setForm(initialFormState)
       navigate(`/entities/${createdEntity.id}`)
     },
   })
@@ -140,20 +144,6 @@ export default function EntitiesPage() {
                   className="block w-full rounded border border-slate-700 bg-slate-900 px-3 py-2 text-sm text-slate-100"
                 />
               </div>
-              <div>
-                <label htmlFor="entity-context-window" className="mb-1 block text-sm font-medium text-slate-200">
-                  Default Email Context Window (days)
-                </label>
-                <input
-                  id="entity-context-window"
-                  type="number"
-                  value={form.contextWindowDays}
-                  onChange={(e) => setForm({ ...form, contextWindowDays: Number(e.target.value) })}
-                  className="block w-full rounded border border-slate-700 bg-slate-900 px-3 py-2 text-sm text-slate-100"
-                  min={1}
-                  required
-                />
-              </div>
               <div className="flex justify-end gap-2 pt-2">
                 <button
                   type="button"