feat(translation): live re-translate progress in the Settings card

translation/status now reports `active` (a translate/retranslate sweep is
running, from the TaskRun table) and `last_run` (the most recent finished run's
task + status). The Settings card polls live while a sweep runs, showing a
spinner + "Translating… N remaining" that ticks down, and flags a last run that
ended in error/timeout. No migration.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/settings/TranslationCard.vue

@@ -52,11 +52,25 @@
         prepend-icon="mdi-refresh" :loading="retranslating"
         :disabled="!enabled || !baseUrl" @click="confirmAll = true"
       >Re-translate all</v-btn>
-      <span v-if="status" class="fc-muted text-caption">
+      <span
+        v-if="status && status.active"
+        class="fc-muted text-caption d-inline-flex align-center" style="gap: 6px;"
+      >
+        <v-progress-circular indeterminate size="12" width="2" color="accent" />
+        Translating… {{ status.untranslated_count }} remaining
+      </span>
+      <span v-else-if="status" class="fc-muted text-caption">
         {{ status.untranslated_count }}
         post{{ status.untranslated_count === 1 ? '' : 's' }} awaiting translation
       </span>
     </div>
+    <p
+      v-if="status && status.last_run && ['error', 'timeout'].includes(status.last_run.status)"
+      class="text-caption text-error mt-1 mb-0"
+    >
+      Last translation run ended with “{{ status.last_run.status }}”. It resumes on
+      the next sweep; check the Interpreter connection if it persists.
+    </p>
     <p class="fc-muted text-caption mt-2 mb-0">
       Use <strong>Re-translate all</strong> after switching the Interpreter model —
       it clears every stored translation and re-runs it through the new model
@@ -94,7 +108,7 @@
 </template>
 
 <script setup>
-import { computed, onMounted, ref } from 'vue'
+import { computed, onMounted, onUnmounted, ref } from 'vue'
 import { toast } from '../../utils/toast.js'
 import { useApi } from '../../composables/useApi.js'
 import { useImportStore } from '../../stores/import.js'
@@ -126,10 +140,16 @@ const statusText = computed(() => {
   return status.value.healthy ? 'Interpreter reachable' : 'Interpreter unreachable'
 })
 
+let pollTimer = null
 async function loadStatus() {
   try { status.value = await api.get('/api/settings/translation/status') }
   catch { status.value = null }
+  // Poll live while a sweep is running so the remaining count ticks down; stop
+  // when idle (a fresh trigger restarts it via its own setTimeout(loadStatus)).
+  clearTimeout(pollTimer)
+  if (status.value?.active) pollTimer = setTimeout(loadStatus, 3000)
 }
+onUnmounted(() => clearTimeout(pollTimer))
 
 async function onTest() {
   // Ping /v1/health for the CURRENTLY-typed URL (not the saved one), so a new