feat(ui): grounding overlay leads with the hovered tag, crop origin as subtext (#1206)

The overlay label showed only the crop origin (booru:head / panel / person-m).
Put the hovered TAG on top as the headline and demote the crop origin to a small,
dimmed, monospace subline — the tag is what you're evaluating; the origin is just
provenance. Threads the tag name through the fcSuggestionHover payload ({g, tag})
from both setters (SuggestionItem for suggestions, TagChip for applied chips).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

frontend/src/components/modal/ImageCanvas.vue

@@ -35,7 +35,10 @@
         :class="{ 'fc-canvas__region--whole': !regionStyle }"
         :style="regionStyle || {}"
       >
-        <span class="fc-canvas__region-label">{{ regionLabel }}</span>
+        <span class="fc-canvas__region-label">
+          <span v-if="regionTag" class="fc-canvas__region-tag">{{ regionTag }}</span>
+          <span class="fc-canvas__region-origin">{{ regionOrigin }}</span>
+        </span>
       </div>
     </div>
   </div>
@@ -48,10 +51,12 @@ import { usePanZoom } from '../../composables/usePanZoom.js'
 const props = defineProps({
   src: String,
   alt: String,
-  // Hovered-suggestion grounding, or null when nothing is hovered:
-  //   null                        → no overlay
-  //   { g: {bbox,kind,detector} } → highlight that crop region
-  //   { g: null }                 → whole-image frame (not localized)
+  // Hovered-suggestion state, or null when nothing is hovered:
+  //   null                             → no overlay
+  //   { g: {bbox,kind,detector}, tag } → highlight that crop, label with the tag
+  //   { g: null, tag }                 → whole-image frame (not localized)
+  // `tag` is the hovered concept's name (primary label line); `g` is where the
+  // crop came from (secondary provenance line).
   hover: { type: Object, default: null },
 })
 const emit = defineEmits(['close-request'])
@@ -86,7 +91,12 @@ const regionStyle = computed(() => {
     width: `${rw * 100}%`, height: `${rh * 100}%`,
   }
 })
-const regionLabel = computed(() => {
+// The hovered tag/suggestion name — the PRIMARY label line (what you care about).
+const regionTag = computed(() => props.hover?.tag || '')
+// Where the winning crop came from (the region's detector_version, else kind) —
+// shown small + dimmed beneath the tag as provenance, not the headline. "whole
+// image" = null grounding (the global vector won, not a crop).
+const regionOrigin = computed(() => {
   const g = props.hover?.g
   return g ? (g.detector || g.kind || 'region') : 'whole image'
 })
@@ -176,15 +186,26 @@ function onCanvasClick(ev) {
   position: absolute;
   top: 0; left: 0;
   transform: translateY(-100%);
-  font-size: 11px;
-  font-family: 'JetBrains Mono', monospace;
-  line-height: 1.4;
-  padding: 1px 6px;
+  display: flex; flex-direction: column;
+  line-height: 1.25;
+  padding: 2px 6px;
   white-space: nowrap;
   background: rgb(var(--v-theme-accent));
   color: rgb(var(--v-theme-on-surface));
   border-radius: 3px 3px 0 0;
 }
+/* The hovered tag is the headline. */
+.fc-canvas__region-tag {
+  font-size: 12px;
+  font-weight: 600;
+}
+/* Crop origin is provenance, not the point — subordinate: smaller, dimmed, and
+   monospace (it's a detector token like booru:head, not prose). */
+.fc-canvas__region-origin {
+  font-size: 10px;
+  font-family: 'JetBrains Mono', monospace;
+  color: rgb(var(--v-theme-on-surface), 0.72);
+}
 .fc-canvas__region--whole .fc-canvas__region-label {
   background: rgb(var(--v-theme-on-surface-variant));
 }

frontend/src/components/modal/SuggestionItem.vue

@@ -85,7 +85,7 @@ defineEmits(['accept', 'alias', 'remove-alias', 'dismiss', 'undismiss'])
 // it highlights that region. Provided by ImageViewer/Explore; a no-op elsewhere.
 const hover = inject('fcSuggestionHover', null)
 function onEnter () {
-  if (hover) hover.value = { g: props.suggestion.grounding ?? null }
+  if (hover) hover.value = { g: props.suggestion.grounding ?? null, tag: props.suggestion.display_name }
 }
 function onLeave () {
   if (hover) hover.value = null

frontend/src/components/modal/TagChip.vue

@@ -83,7 +83,7 @@ async function onEnter () {
   if (seq !== hoverSeq) return   // pointer already left / moved to another chip
   // No head → nothing to localize; don't draw an overlay at all. With a head,
   // null grounding still draws the whole-image frame ("the global vector won").
-  if (res.has_head) hover.value = { g: res.grounding ?? null }
+  if (res.has_head) hover.value = { g: res.grounding ?? null, tag: props.tag.name }
 }
 function onLeave () {
   hoverSeq++