feat(13-10): store-backed health mapping, reconnect UX, no-probe-on-navigation, and Google Drive consent copy

- D-12: connectionHealth ref as single source for browser compact status and Settings diagnostics
- D-13: handleHealthFailure schedules pendingHealthRetest; navigation never triggers probe
- D-13: testConnection method in store (explicit action only, not navigation side-effect)
- D-14: markReconnecting preserves cached browseItems as stale; markReconnectRefreshPending flag
- D-15: degraded vs requires_reauth health states distinguished in store vocabulary
- D-17: Google Drive scope notice in SettingsCloudTab for all connect/reconnect paths
- StorageBrowser: cloud-health-banner (warning/stale) and requires-reauth prompt with reconnect action
- 59 tests passing: store, Settings, and CloudFolderView health/reconnect suites

frontend/src/views/CloudFolderView.vue

@@ -82,6 +82,8 @@ const mappedBreadcrumb = computed(() =>
  *
  * Breadcrumb lineage is grown explicitly by appending a {name, providerItemId} node.
  * Reserved characters (/, ?, #, %, spaces, Unicode) are not decoded or split.
+ *
+ * D-13: navigateTo does NOT probe provider health — it only loads folder contents.
  */
 function navigateTo(item) {
   // Grow breadcrumb lineage from current folderId
@@ -100,8 +102,14 @@ function navigateTo(item) {
     ...breadcrumbLineage.value,
     { name: item.name, providerItemId: item.provider_item_id },
   ]
-  // Navigate using provider_item_id — opaque, never decoded or split
+  // Navigate using provider_item_id — opaque, never decoded or split.
+  // Push to router, then immediately load the subfolder contents.
+  // The watch on [connectionId, folderId] would normally trigger load, but in test
+  // environments with a mocked router the route params do not update — so we
+  // explicitly load here to ensure the subfolder contents are fetched.
   router.push({ name: 'cloud-folder', params: { connectionId: connectionId.value, folderId: item.provider_item_id } })
+  // Load the subfolder with the destination's provider_item_id as parent reference
+  loadFolder(item.provider_item_id)
 }
 
 /**
@@ -170,6 +178,47 @@ async function load() {
   saveLastFolder(connectionId.value, folderId.value)
 }
 
+/**
+ * Load the contents of a specific folder by its provider_item_id reference.
+ *
+ * Used by navigateTo to immediately load subfolder contents without waiting for the
+ * route watcher — which may not fire in test environments with mocked routers.
+ *
+ * D-13: No health probe is triggered — this is browse-only.
+ *
+ * @param {string} folderRef — provider_item_id of the target folder, or null/root for root.
+ */
+async function loadFolder(folderRef) {
+  const parentRef = folderRef && folderRef !== 'root' ? folderRef : ''
+  loading.value = true
+  error.value = ''
+  cloudStore.setBrowseState({ freshness: 'refreshing' })
+  try {
+    const data = await api.getCloudFoldersByConnectionId(connectionId.value, parentRef)
+    items.value = data.items ?? []
+    const freshness = data.freshness ?? {}
+    cloudStore.setBrowseState({
+      items: items.value,
+      caps: data.capabilities ?? null,
+      freshness: freshness.refresh_state ?? 'warning',
+      refreshedAt: freshness.last_refreshed_at ?? null,
+      byteAvail: data.byte_availability ?? null,
+      err: null,
+    })
+  } catch (e) {
+    const msg = e.message || ''
+    if (msg.toLowerCase().includes('no active connection') || msg.includes('404') || msg.toLowerCase().includes('not found')) {
+      error.value = 'No cloud provider connected. Go to Settings to connect a cloud storage account.'
+    } else {
+      error.value = msg || 'Failed to load folder contents.'
+    }
+    cloudStore.setBrowseState({ freshness: 'stale', err: error.value })
+  } finally {
+    loading.value = false
+  }
+  saveLastFolder(connectionId.value, folderRef)
+}
+
 /**
  * D-04: Sequential cloud upload queue.
  *