fix: set account_id on all Session constructors; fix 3 ESLint errors in CI

Backend: start_session, prepare_session, batch_launch_sessions all missing
account_id=current_user.account_id — Phase 1 NOT NULL constraint made these
500 in test suite (test_ratings.py fixture couldn't create sessions).

Frontend ESLint:
- TaskLane.tsx: suppress react-refresh/only-export-components for clearTaskState
- TeamSummary.tsx: init loading from isAccountOwner to avoid sync setState in effect
- ScriptBodyEditor.tsx: move lastValueRef.current assignment into useEffect

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/api/endpoints/sessions.py

@@ -196,6 +196,7 @@ async def start_session(
     new_session = Session(
         tree_id=tree.id,
         user_id=current_user.id,
+        account_id=current_user.account_id,
         tree_snapshot=tree_snapshot,
         path_taken=[],
         decisions=[],
@@ -693,6 +694,7 @@ async def prepare_session(
     new_session = Session(
         tree_id=tree.id,
         user_id=data.assigned_to_id or current_user.id,
+        account_id=current_user.account_id,
         tree_snapshot=tree_snapshot,
         path_taken=[],
         decisions=[],
@@ -770,6 +772,7 @@ async def batch_launch_sessions(
         session = Session(
             tree_id=tree.id,
             user_id=current_user.id,
+            account_id=current_user.account_id,
             tree_snapshot=tree_snapshot,
             path_taken=[],
             decisions=[],

frontend/src/components/assistant/TaskLane.tsx

@@ -57,6 +57,7 @@ function loadTaskState(sessionId: string): TaskResponse[] | null {
   } catch { return null }
 }
 
+// eslint-disable-next-line react-refresh/only-export-components
 export function clearTaskState(sessionId: string) {
   try { sessionStorage.removeItem(`${TASK_LANE_STORAGE_KEY}:${sessionId}`) } catch { /* ignore */ }
 }

frontend/src/components/dashboard/TeamSummary.tsx

@@ -9,10 +9,10 @@ export function TeamSummary() {
   const { isAccountOwner } = usePermissions()
   const navigate = useNavigate()
   const [escalationCount, setEscalationCount] = useState(0)
-  const [loading, setLoading] = useState(true)
+  const [loading, setLoading] = useState(!!isAccountOwner)
 
   useEffect(() => {
-    if (!isAccountOwner) { setLoading(false); return }
+    if (!isAccountOwner) return
     aiSessionsApi.getEscalationQueue()
       .then((esc) => setEscalationCount(esc.length))
       .catch(() => {})

frontend/src/components/script-editor/ScriptBodyEditor.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useRef } from 'react'
+import { useCallback, useEffect, useRef } from 'react'
 import Editor, { type BeforeMount } from '@monaco-editor/react'
 import { resolutionFlowTheme, THEME_ID } from '@/components/tree-editor/code-mode/resolutionFlowTheme'
 import { Spinner } from '@/components/common/Spinner'
@@ -11,7 +11,9 @@ interface Props {
 
 export function ScriptBodyEditor({ value, onChange, disabled }: Props) {
   const lastValueRef = useRef(value)
-  lastValueRef.current = value
+  useEffect(() => {
+    lastValueRef.current = value
+  }, [value])
 
   const handleBeforeMount: BeforeMount = useCallback((monaco) => {
     // Register our dark theme if not already defined