style(ui): auto-tag Keep button matches the suggestion accept button

The ✓ Keep on a provisional auto-tag chip was a smaller tinted-outline variant;
make it the SAME filled green circle (white ✓, 26px, opacity 0.9→1 + scale on
hover, accent focus ring) as the suggestion accept button (.fc-act--yes in
SuggestionItem) so "accept this tag" reads identically across surfaces
(operator-asked).

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

frontend/src/components/modal/TagChip.vue

@@ -29,7 +29,7 @@
       :title="`Keep “${tag.name}” — confirm this auto-tag so it trains the model and won't be retracted`"
       :aria-label="`Confirm ${tag.name}`"
       @click.stop="$emit('confirm', tag)"
-    ><v-icon size="14">mdi-check</v-icon></button>
+    ><v-icon size="16">mdi-check</v-icon></button>
     <!-- Modal-safe kebab is baked into KebabMenu (this chip lives in the
          teleported image modal — #711). System tags hide it entirely: rename
          is refused server-side (the hygiene machinery keys on the row) and
@@ -152,16 +152,18 @@ function iconFor (k) { return KIND_ICONS[k] || 'mdi-tag' }
   border: 1px solid rgb(var(--v-theme-on-surface-variant), 0.3);
   padding: 0 4px; border-radius: 999px;
 }
-/* Keep/confirm — a success-tinted check next to a provisional auto-tag. */
+/* Keep/confirm — the SAME filled green ✓ circle as the suggestion accept button
+   (.fc-act--yes in SuggestionItem), so "accept this tag" reads identically
+   wherever it appears (operator-asked 2026-07-06). */
 .fc-tag-chip__confirm {
   flex: 0 0 auto;
+  width: 26px; height: 26px; border-radius: 50%; border: none; cursor: pointer;
   display: inline-flex; align-items: center; justify-content: center;
-  width: 20px; height: 20px; border-radius: 50%;
-  border: none; background: transparent; cursor: pointer;
-  color: rgb(var(--v-theme-success));
+  color: #fff; background: rgb(var(--v-theme-success));
+  opacity: 0.9; transition: transform 0.1s, opacity 0.1s;
 }
-.fc-tag-chip__confirm:hover { background: rgb(var(--v-theme-success), 0.14); }
+.fc-tag-chip__confirm:hover { opacity: 1; transform: scale(1.1); }
 .fc-tag-chip__confirm:focus-visible {
-  outline: 2px solid rgb(var(--v-theme-success)); outline-offset: 1px;
+  outline: 2px solid rgb(var(--v-theme-accent)); outline-offset: 1px;
 }
 </style>