M-029 Pass 1 batch 2: migrate 5 two-mutation pages to useTrackedMutation

Drains 10 more useMutation sites (52 -> 42). Each migration declares explicit

invalidates per the M-009 contract.

Pages migrated:

  - DashboardPage.tsx        previewDigest + sendDigest both 'noop' (read-only

                              preview / fire-and-forget email — no client cache impact)

  - DiscoveryPage.tsx        claim + dismiss both invalidate

                              [['discovered-certificates'], ['discovery-summary']]

  - NotificationsPage.tsx    markRead + requeue both invalidate [['notifications']]

  - TargetDetailPage.tsx     update + testConnection both invalidate [['target', id]]

  - TargetsPage.tsx          createTarget + deleteTarget both invalidate [['targets']]

Verification:

  legacy useMutation count   52 -> 42 (-10)

  useTrackedMutation count    4 -> 14 (+10)

Closes 14 of 56 sites toward M-029 Pass 1 completion.

web/src/pages/DashboardPage.tsx

@@ -1,5 +1,6 @@
 import { useState } from 'react';
-import { useQuery, useMutation } from '@tanstack/react-query';
+import { useQuery } from '@tanstack/react-query';
+import { useTrackedMutation } from '../hooks/useTrackedMutation';
 import { useNavigate, useSearchParams } from 'react-router-dom';
 import {
   BarChart, Bar, LineChart, Line, PieChart, Pie, Cell,
@@ -81,15 +82,21 @@ function DigestCard() {
   const [previewHtml, setPreviewHtml] = useState<string | null>(null);
   const [showPreview, setShowPreview] = useState(false);
 
-  const previewMutation = useMutation({
+  const previewMutation = useTrackedMutation({
     mutationFn: previewDigest,
+    invalidates: 'noop',
+    noopReason: 'previewDigest is read-only — server renders HTML; no cached query touched',
     onSuccess: (html) => {
       setPreviewHtml(html);
       setShowPreview(true);
     },
   });
 
-  const sendMutation = useMutation({ mutationFn: sendDigest });
+  const sendMutation = useTrackedMutation({
+    mutationFn: sendDigest,
+    invalidates: 'noop',
+    noopReason: 'sendDigest dispatches an email server-side; no cached client query reflects digest-send state',
+  });
 
   return (
     <>

web/src/pages/DiscoveryPage.tsx

@@ -1,5 +1,6 @@
 import { useState } from 'react';
-import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import { useQuery } from '@tanstack/react-query';
+import { useTrackedMutation } from '../hooks/useTrackedMutation';
 import {
   getDiscoveredCertificates,
   getDiscoverySummary,
@@ -110,7 +111,6 @@ export default function DiscoveryPage() {
   const [agentFilter, setAgentFilter] = useState('');
   const [claimingCert, setClaimingCert] = useState<DiscoveredCertificate | null>(null);
   const [showScans, setShowScans] = useState(false);
-  const queryClient = useQueryClient();
 
   const params: Record<string, string> = {};
   if (statusFilter) params.status = statusFilter;
@@ -139,22 +139,18 @@ export default function DiscoveryPage() {
     queryFn: () => getAgents({ per_page: '200' }),
   });
 
-  const claimMutation = useMutation({
+  const claimMutation = useTrackedMutation({
     mutationFn: ({ id, managedCertId }: { id: string; managedCertId: string }) =>
       claimDiscoveredCertificate(id, managedCertId),
+    invalidates: [['discovered-certificates'], ['discovery-summary']],
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['discovered-certificates'] });
-      queryClient.invalidateQueries({ queryKey: ['discovery-summary'] });
       setClaimingCert(null);
     },
   });
 
-  const dismissMutation = useMutation({
+  const dismissMutation = useTrackedMutation({
     mutationFn: dismissDiscoveredCertificate,
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['discovered-certificates'] });
-      queryClient.invalidateQueries({ queryKey: ['discovery-summary'] });
-    },
+    invalidates: [['discovered-certificates'], ['discovery-summary']],
   });
 
   const formatExpiry = (notAfter?: string) => {

web/src/pages/NotificationsPage.tsx

@@ -1,5 +1,6 @@
 import { useState, useMemo } from 'react';
-import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import { useQuery } from '@tanstack/react-query';
+import { useTrackedMutation } from '../hooks/useTrackedMutation';
 import { getNotifications, markNotificationRead, requeueNotification } from '../api/client';
 import PageHeader from '../components/PageHeader';
 import StatusBadge from '../components/StatusBadge';
@@ -22,7 +23,6 @@ export default function NotificationsPage() {
   const [typeFilter, setTypeFilter] = useState('');
   const [statusFilter, setStatusFilter] = useState('');
   const [activeTab, setActiveTab] = useState<ActiveTab>('all');
-  const queryClient = useQueryClient();
 
   const { data, isLoading, error, refetch } = useQuery({
     // I-005: queryKey carries the active tab so TanStack Query treats
@@ -43,9 +43,9 @@ export default function NotificationsPage() {
     refetchInterval: 30000,
   });
 
-  const markRead = useMutation({
+  const markRead = useTrackedMutation({
     mutationFn: markNotificationRead,
-    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['notifications'] }),
+    invalidates: [['notifications']],
   });
 
   // I-005: requeue a dead notification. Invalidates both tab cache entries
@@ -60,9 +60,9 @@ export default function NotificationsPage() {
   // assertion fails on the extra argument. Keep the arrow even if the context
   // object later becomes structurally empty — the contract pins a single-arg
   // call and the page must not leak mutation machinery into API boundaries.
-  const requeue = useMutation({
+  const requeue = useTrackedMutation({
     mutationFn: (id: string) => requeueNotification(id),
-    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['notifications'] }),
+    invalidates: [['notifications']],
   });
 
   const notifications = data?.data || [];

web/src/pages/TargetDetailPage.tsx

@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { useParams, Link } from 'react-router-dom';
-import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import { useQuery } from '@tanstack/react-query';
+import { useTrackedMutation } from '../hooks/useTrackedMutation';
 import { getTarget, getJobs, updateTarget, testTargetConnection } from '../api/client';
 import PageHeader from '../components/PageHeader';
 import StatusBadge from '../components/StatusBadge';
@@ -70,23 +71,20 @@ function SourceBadge({ source }: { source?: string }) {
 
 export default function TargetDetailPage() {
   const { id } = useParams<{ id: string }>();
-  const queryClient = useQueryClient();
   const [isEditing, setIsEditing] = useState(false);
   const [editName, setEditName] = useState('');
 
-  const updateMutation = useMutation({
+  const updateMutation = useTrackedMutation({
     mutationFn: (data: Partial<{ name: string }>) => updateTarget(id!, data),
+    invalidates: [['target', id]],
     onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['target', id] });
       setIsEditing(false);
     },
   });
 
-  const testMutation = useMutation({
+  const testMutation = useTrackedMutation({
     mutationFn: () => testTargetConnection(id!),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['target', id] });
-    },
+    invalidates: [['target', id]],
   });
 
   const { data: target, isLoading, error, refetch } = useQuery({

web/src/pages/TargetsPage.tsx

@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { Link } from 'react-router-dom';
-import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
+import { useQuery, useQueryClient } from '@tanstack/react-query';
+import { useTrackedMutation } from '../hooks/useTrackedMutation';
 import { getTargets, createTarget, deleteTarget, getAgents } from '../api/client';
 import PageHeader from '../components/PageHeader';
 import DataTable from '../components/DataTable';
@@ -242,13 +243,14 @@ function CreateTargetWizard({ onClose, onSuccess }: { onClose: () => void; onSuc
     return result;
   };
 
-  const mutation = useMutation({
+  const mutation = useTrackedMutation({
     mutationFn: () => createTarget({
       name,
       type: targetType,
       agent_id: agentId,
       config: buildConfigPayload(),
     }),
+    invalidates: [['targets']],
     onSuccess: () => onSuccess(),
     onError: (err: Error) => setError(err.message),
   });
@@ -407,9 +409,9 @@ export default function TargetsPage() {
     queryFn: () => getTargets(),
   });
 
-  const deleteMutation = useMutation({
+  const deleteMutation = useTrackedMutation({
     mutationFn: deleteTarget,
-    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['targets'] }),
+    invalidates: [['targets']],
   });
 
   const columns: Column<Target>[] = [