feat(frontend): auto-consolidate tasks toggle in General settings

New Tasks section in the General tab with a single checkbox controlling
whether the consolidation pipeline fires automatically. Persists to the
auto_consolidate_tasks user setting (string 'true'/'false'). Manual
'Re-consolidate' in the task editor bypasses the gate.

frontend/src/views/SettingsView.vue

@@ -19,6 +19,21 @@ const defaultModel = ref("");
 const userTimezone = ref("");
 const savingTimezone = ref(false);
 const timezoneSaved = ref(false);
+const autoConsolidateTasks = ref(true);
+const savingAutoConsolidate = ref(false);
+
+async function saveAutoConsolidate() {
+  savingAutoConsolidate.value = true;
+  try {
+    await apiPut('/api/settings', {
+      auto_consolidate_tasks: autoConsolidateTasks.value ? "true" : "false",
+    });
+  } catch {
+    toastStore.show('Failed to save setting', 'error');
+  } finally {
+    savingAutoConsolidate.value = false;
+  }
+}
 
 function detectTimezone() {
   userTimezone.value = Intl.DateTimeFormat().resolvedOptions().timeZone;
@@ -754,6 +769,8 @@ onMounted(async () => {
   defaultModel.value = allSettings.default_model ?? "";
   backgroundModel.value = allSettings.background_model ?? "";
   userTimezone.value = allSettings.user_timezone ?? "";
+  // Default true if unset; explicit "false" disables auto-consolidation.
+  autoConsolidateTasks.value = (allSettings.auto_consolidate_tasks ?? "true") !== "false";
   chatRetentionDays.value = allSettings.chat_retention_days !== undefined
     ? Number(allSettings.chat_retention_days)
     : 90;
@@ -1510,6 +1527,29 @@ function formatUserDate(iso: string): string {
         </div>
       </section>
 
+      <!-- Tasks -->
+      <section class="settings-section full-width">
+        <h2>Tasks</h2>
+        <p class="section-desc">
+          Task bodies are auto-summarized from accumulated work logs. The summary runs every few logs, plus on task close.
+        </p>
+        <div class="field">
+          <label class="checkbox-label">
+            <input
+              type="checkbox"
+              v-model="autoConsolidateTasks"
+              :disabled="savingAutoConsolidate"
+              @change="saveAutoConsolidate"
+            />
+            Auto-consolidate task bodies
+          </label>
+          <p class="field-hint">
+            When off, the task body is only refreshed when you click "Re-consolidate"
+            on a task. Existing summaries remain in place.
+          </p>
+        </div>
+      </section>
+
       <!-- Timezone -->
       <section class="settings-section full-width">
         <h2>Timezone</h2>