feat(fc3c): /subscriptions Check Now button — wires SourceRow → store.checkNow

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

frontend/src/components/subscriptions/SourceRow.vue

@@ -11,14 +11,22 @@
       density="compact" hide-details color="accent"
       @update:model-value="onToggleEnabled"
     />
+    <v-btn
+      icon="mdi-play" size="x-small" variant="text"
+      :loading="checking"
+      @click="$emit('check', source)"
+    />
     <v-btn icon="mdi-pencil" size="x-small" variant="text" @click="$emit('edit', source)" />
     <v-btn icon="mdi-close" size="x-small" variant="text" @click="$emit('remove', source)" />
   </div>
 </template>
 
 <script setup>
-const props = defineProps({ source: { type: Object, required: true } })
-const emit = defineEmits(['edit', 'remove', 'toggle'])
+const props = defineProps({
+  source: { type: Object, required: true },
+  checking: { type: Boolean, default: false },
+})
+const emit = defineEmits(['edit', 'remove', 'toggle', 'check'])
 function onToggleEnabled(value) {
   emit('toggle', { source: props.source, enabled: value })
 }
@@ -27,7 +35,7 @@ function onToggleEnabled(value) {
 <style scoped>
 .fc-source-row {
   display: grid;
-  grid-template-columns: 96px 1fr auto auto auto;
+  grid-template-columns: 96px 1fr auto auto auto auto;
   gap: 0.75rem;
   align-items: center;
   padding: 0.4rem 0;