feat(tag-eval): inline confirm/reject actions on example thumbnails

Closes the learn-from-tags loop directly on the eval lists (operator-flagged:
no surface to confirm/refine the head's suggestions). Each thumbnail gets a
green ✓ / red ✗ that writes the SAME tables the head trains on:
- suggest + ✓  → apply tag (new positive, POST /images/<id>/tags)
- suggest + ✗  → record rejection (hard negative, suggestions/dismiss)
- doubt   + ✗  → remove tag + record rejection (kill bad positive, add negative)
- doubt   + ✓  → keep (stays a positive, no write)
Acted thumbs grey out with a badge; re-run to see the head sharpen. Thumb still
links to /explore/<id>. All endpoints already existed — no backend change.

Inline is the starting point; longer-term the modal Suggestions rail gets the
red "No" (negative) so per-image rejection is native there too (next slice).

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

frontend/src/components/settings/TagEvalCard.vue

@@ -86,28 +86,41 @@
           </div>
 
           <div v-if="c.examples" class="fc-ex">
-            <div class="fc-ex__row">
-              <div class="fc-muted text-caption mb-1">Head would suggest (untagged, high score) — click to open in Explore</div>
+            <div
+              v-for="grp in [
+                { dir: 'suggest', items: c.examples.head_would_suggest,
+                  label: `Head would suggest — ✓ tag it, ✗ not ${c.name}` },
+                { dir: 'doubts', items: c.examples.head_doubts_positive,
+                  label: `Head doubts your tag — ✓ keep, ✗ remove (not ${c.name})` },
+              ]" :key="grp.dir" class="fc-ex__row"
+            >
+              <div class="fc-muted text-caption mb-1">{{ grp.label }}</div>
               <div class="fc-ex__thumbs">
-                <a
-                  v-for="it in c.examples.head_would_suggest" :key="`s${it.id}`"
-                  class="fc-ex__thumb" :href="`/explore/${it.id}`" target="_blank"
-                  rel="noopener" :title="`#${it.id} — open in Explore`"
+                <div
+                  v-for="it in grp.items" :key="`${grp.dir}${it.id}`"
+                  class="fc-ex__item"
+                  :class="actedLabel(c, grp.dir, it) ? 'fc-ex__item--acted' : ''"
                 >
-                  <img :src="it.thumbnail_url" loading="lazy" />
-                </a>
-              </div>
-            </div>
-            <div class="fc-ex__row">
-              <div class="fc-muted text-caption mb-1">Head doubts these (your positives, low score) — click to open in Explore</div>
-              <div class="fc-ex__thumbs">
-                <a
-                  v-for="it in c.examples.head_doubts_positive" :key="`d${it.id}`"
-                  class="fc-ex__thumb" :href="`/explore/${it.id}`" target="_blank"
-                  rel="noopener" :title="`#${it.id} — open in Explore`"
-                >
-                  <img :src="it.thumbnail_url" loading="lazy" />
-                </a>
+                  <a
+                    class="fc-ex__thumb" :href="`/explore/${it.id}`" target="_blank"
+                    rel="noopener" :title="`#${it.id} — open in Explore`"
+                  >
+                    <img :src="it.thumbnail_url" loading="lazy" />
+                  </a>
+                  <div v-if="actedLabel(c, grp.dir, it)" class="fc-ex__badge">
+                    {{ actedLabel(c, grp.dir, it) }}
+                  </div>
+                  <div v-else class="fc-ex__acts">
+                    <button
+                      class="fc-act fc-act--yes" type="button"
+                      :title="`Yes — it is ${c.name}`" @click="act(c, it, grp.dir, 'yes')"
+                    ><v-icon size="15">mdi-check</v-icon></button>
+                    <button
+                      class="fc-act fc-act--no" type="button"
+                      :title="`No — not ${c.name}`" @click="act(c, it, grp.dir, 'no')"
+                    ><v-icon size="15">mdi-close</v-icon></button>
+                  </div>
+                </div>
               </div>
             </div>
           </div>
@@ -189,6 +202,28 @@ function formatTime(iso) {
   if (!iso) return ''
   try { return new Date(iso).toLocaleString() } catch { return iso }
 }
+
+// Acting on an example writes the SAME tables the head trains on, so a re-run
+// reflects the correction. Keyed per (concept, list, image); the report ids are
+// frozen at run time, so we just grey out what's been handled in this view.
+const acted = ref({})
+const actedKey = (c, dir, it) => `${c.tag_id}:${dir}:${it.id}`
+const actedLabel = (c, dir, it) => acted.value[actedKey(c, dir, it)] || ''
+
+async function act(c, it, dir, verdict) {
+  const key = actedKey(c, dir, it)
+  let call, label
+  if (dir === 'suggest' && verdict === 'yes') { call = store.applyTag(it.id, c.tag_id); label = 'tagged' }
+  else if (dir === 'suggest' && verdict === 'no') { call = store.rejectTag(it.id, c.tag_id); label = 'rejected' }
+  else if (dir === 'doubts' && verdict === 'no') { call = store.removeTag(it.id, c.tag_id); label = 'removed' }
+  else { acted.value[key] = 'kept'; return }   // doubt + yes = keep, no write
+  try {
+    await call
+    acted.value[key] = label
+  } catch (e) {
+    toast({ text: `Action failed: ${e.message}`, type: 'error' })
+  }
+}
 </script>
 
 <style scoped>
@@ -210,11 +245,27 @@ function formatTime(iso) {
 .fc-curve__pt { margin-left: 10px; font-size: 13px; font-variant-numeric: tabular-nums; }
 .fc-ex__row { margin-top: 8px; }
 .fc-ex__thumbs { display: flex; flex-wrap: wrap; gap: 6px; }
+.fc-ex__item { position: relative; width: 120px; height: 120px; }
+.fc-ex__item--acted { opacity: 0.45; }
 .fc-ex__thumb {
-  display: block; width: 120px; height: 120px; border-radius: 6px;
+  display: block; width: 100%; height: 100%; border-radius: 6px;
   overflow: hidden; background: rgb(var(--v-theme-surface-light));
   outline: 1px solid transparent; transition: outline-color 0.12s;
 }
 .fc-ex__thumb:hover { outline-color: rgb(var(--v-theme-accent)); }
 .fc-ex__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
+.fc-ex__acts { position: absolute; top: 4px; right: 4px; display: flex; gap: 4px; }
+.fc-act {
+  width: 26px; height: 26px; border-radius: 50%; border: none; cursor: pointer;
+  display: flex; align-items: center; justify-content: center; color: #fff;
+  opacity: 0.9; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4); transition: transform 0.1s;
+}
+.fc-act:hover { opacity: 1; transform: scale(1.1); }
+.fc-act--yes { background: rgb(var(--v-theme-success)); }
+.fc-act--no { background: rgb(var(--v-theme-error)); }
+.fc-ex__badge {
+  position: absolute; bottom: 4px; left: 4px; right: 4px; text-align: center;
+  font-size: 10px; text-transform: uppercase; letter-spacing: 0.05em;
+  background: rgba(0, 0, 0, 0.65); color: #fff; border-radius: 3px; padding: 1px 0;
+}
 </style>

frontend/src/stores/tagEval.js

@@ -23,5 +23,29 @@ export const useTagEvalStore = defineStore('tagEval', () => {
     return (body.runs && body.runs[0]) || null
   }
 
-  return { start, getRun, latest }
+  // --- Acting on the head's example lists (closes the learn-from-tags loop).
+  // These write the SAME tables the head trains on: image_tag (positives) and
+  // tag_suggestion_rejection (negatives, via the dismiss endpoint).
+
+  // "Yes, it is this" — apply the tag (new positive).
+  async function applyTag(imageId, tagId) {
+    return await api.post(`/api/images/${imageId}/tags`,
+      { body: { tag_id: tagId, source: 'manual' } })
+  }
+
+  // "No, it's not" on an UNtagged suggestion — record a rejection (hard negative).
+  async function rejectTag(imageId, tagId) {
+    return await api.post(`/api/images/${imageId}/suggestions/dismiss`,
+      { body: { tag_id: tagId } })
+  }
+
+  // "Not it" on one of YOUR positives the head doubts — remove the tag AND
+  // record the rejection (kills the bad positive, leaves a hard negative).
+  async function removeTag(imageId, tagId) {
+    await api.delete(`/api/images/${imageId}/tags/${tagId}`)
+    return await api.post(`/api/images/${imageId}/suggestions/dismiss`,
+      { body: { tag_id: tagId } })
+  }
+
+  return { start, getRun, latest, applyTag, rejectTag, removeTag }
 })