feat(fc2b): wire SuggestionsPanel + rename into TagPanel; reject-on-remove

TagPanel now renders SuggestionsPanel below the current-tags area and
adds a per-chip kebab → Rename… (TagRenameDialog). modal store's
removeTag now also POSTs suggestions/dismiss after the delete so removing
an auto-applied tag records a per-image rejection and the allowlist
maintenance sweep won't re-apply it (closes the remove→re-apply loop
identified in the spec).

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

frontend/src/stores/modal.js

@@ -53,7 +53,13 @@ export const useModalStore = defineStore('modal', () => {
     const prev = current.value.tags
     current.value.tags = current.value.tags.filter(t => t.id !== tagId)
     try {
+      // FC-2b: removal also records a per-image rejection (suggestions/dismiss
+      // is the rejection-recording endpoint) so the allowlist maintenance
+      // task won't re-apply this tag to this image.
       await api.delete(`/api/images/${currentImageId.value}/tags/${tagId}`)
+      await api.post(`/api/images/${currentImageId.value}/suggestions/dismiss`, {
+        body: { tag_id: tagId }
+      })
     } catch (e) {
       current.value.tags = prev
       window.__fcToast?.({ text: `Failed to remove tag: ${e.message}`, type: 'error' })