Record and show that an image is already on its newest tag

An image that had been checked and is current looked exactly like one
that was never checked.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/src/components/FindingGroups.test.ts

@@ -151,6 +151,26 @@ describe('FindingGroups for images', () => {
     expect(w.find('button[name=update-image]').exists()).toBe(true)
   })
 
+  it('says the image is current when a check found no newer tag', () => {
+    const current = image({
+      update: {
+        image: 'gitea/gitea:1.22.3',
+        candidate: '',
+        checked_at: '2026-09-03T08:00:00Z',
+        fixed: [],
+        fixed_counts: { critical: 0, high: 0, medium: 0, low: 0, unknown: 0 },
+        candidate_total: 0,
+      },
+    })
+    const w = mount(FindingGroups, {
+      props: { groups: [current], scope: 'container', canAct: true, load: vi.fn() },
+      global: { stubs: { RouterLink: { template: '<a><slot /></a>' } } },
+    })
+    expect(w.text()).toContain('newest tag')
+    expect(w.find('button[name=update-image]').exists()).toBe(false)
+    expect(w.find('button[name=check-image]').exists()).toBe(true)
+  })
+
   it('offers a check when nothing is known yet and hides the actions from viewers', () => {
     const w = mount(FindingGroups, {
       props: { groups: [image()], scope: 'container', canAct: true, load: vi.fn() },

frontend/src/components/FindingGroups.vue

@@ -127,7 +127,18 @@ const shown = (c: SeverityCounts) => chips.filter((s) => c[s.key] > 0)
               </span>
             </td>
             <td v-if="scope === 'container'" class="whitespace-nowrap text-xs" @click.stop>
-              <template v-if="asImage(g).update">
+              <template v-if="asImage(g).update && !asImage(g).update!.candidate">
+                <div class="text-gray-500">on the newest tag</div>
+                <button
+                  v-if="canAct"
+                  name="check-image"
+                  class="text-blue-600 hover:underline"
+                  @click="emit('check', asImage(g))"
+                >
+                  Check again
+                </button>
+              </template>
+              <template v-else-if="asImage(g).update">
                 <div>
                   <span class="font-mono font-medium text-green-700">{{
                     tagOf(asImage(g).update!.candidate)