fc3i(ui): Settings → Activity tab + Overview summary card

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/views/SettingsView.vue

@@ -2,6 +2,7 @@
   <v-container fluid class="py-6">
     <v-tabs v-model="tab" color="accent" class="mb-4">
       <v-tab value="overview">Overview</v-tab>
+      <v-tab value="activity">Activity</v-tab>
       <v-tab value="import">Import</v-tab>
       <v-tab value="maintenance">Maintenance</v-tab>
     </v-tabs>
@@ -9,6 +10,10 @@
     <v-window v-model="tab">
       <v-window-item value="overview">
         <SystemStatsCards :stats="system.stats" />
+        <SystemActivitySummary
+          class="mt-4"
+          @open-activity="tab = 'activity'"
+        />
         <v-alert
           v-if="system.stats && (system.stats.tasks.pending + system.stats.tasks.queued) > 0"
           type="info" variant="tonal" class="mt-4" closable
@@ -18,6 +23,10 @@
         </v-alert>
       </v-window-item>
 
+      <v-window-item value="activity">
+        <SystemActivityTab />
+      </v-window-item>
+
       <v-window-item value="import">
         <ImportTriggerPanel />
         <v-divider class="my-6" />
@@ -38,6 +47,8 @@ import { onMounted, onUnmounted, ref, watch } from 'vue'
 import { useSystemStore } from '../stores/system.js'
 import { useImportStore } from '../stores/import.js'
 import SystemStatsCards from '../components/settings/SystemStatsCards.vue'
+import SystemActivitySummary from '../components/settings/SystemActivitySummary.vue'
+import SystemActivityTab from '../components/settings/SystemActivityTab.vue'
 import ImportTriggerPanel from '../components/settings/ImportTriggerPanel.vue'
 import ImportFiltersForm from '../components/settings/ImportFiltersForm.vue'
 import ImportTaskList from '../components/settings/ImportTaskList.vue'