feat(modal): applied tags drop from search instantly; manual add == accepting a suggestion

Three tag-flow gaps in the view modal (and the Explore workspace, which
shares TagPanel):
- the type-to-add dropdown now filters both its sections against the
  imageledger applied tags reactively, so a just-added tag disappears
  from search the moment the chip rail updates instead of after a
  modal refresh
- manually picking or creating a tag the model also suggested routes
  through the suggestion-accept flow: the acceptance is recorded for
  head training and the row leaves the panel, instead of the add
  silently bypassing the feedback loop
- removing a tag reloads the suggestion lists, so a model-suggested tag
  returns to the suggestions area (flagged rejected, one-click
  reversible) rather than vanishing until the next modal open

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

frontend/src/stores/modal.js

@@ -170,6 +170,9 @@ export const useModalStore = defineStore('modal', () => {
     }
     if (currentImageId.value !== imageId) return  // navigated away
     await addExistingTag(tag.id)
+    // Returned so TagPanel can match the created tag against a pending
+    // suggestion and record the acceptance (manual add == accept, 2026-07-03).
+    return tag
   }
 
   const isOpen = computed(() => currentImageId.value !== null)