feat(modal): fandom picker wiring

Reveals the picker on 'character:' prefix; autocomplete via
/api/tags/search?kind=fandom; submits fandom_id (preferred) or
fandom_name alongside the character name. Clears on image switch
and modal close.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/static/js/view-modal.js

@@ -14,6 +14,11 @@ document.addEventListener('DOMContentLoaded', () => {
   const tagInput  = tagForm ? tagForm.querySelector('input[name="name"]') : null;
   const tagAutocomplete = document.getElementById('tagAutocomplete');
   const tagActionFeedback = document.getElementById('tagActionFeedback');
+  const fandomPickerWrapper = document.getElementById('fandomPickerWrapper');
+  const fandomPickerInput = document.getElementById('fandomPickerInput');
+  const fandomPickerAutocomplete = document.getElementById('fandomPickerAutocomplete');
+  const fandomPickerClear = document.getElementById('fandomPickerClear');
+  let fandomPickerDebounce = null;
   const provenanceSection = document.getElementById('modalProvenanceSection');
   const provenanceList    = document.getElementById('modalProvenanceList');
   const suggestionsSection = document.getElementById('modalSuggestionsSection');
@@ -590,9 +595,14 @@ document.addEventListener('DOMContentLoaded', () => {
     });
   }
 
-  async function addTag(imageId, name) {
+  async function addTag(imageId, name, { fandomId, fandomName } = {}) {
     const fd = new FormData();
     fd.append('name', name);
+    if (fandomId) {
+      fd.append('fandom_id', String(fandomId));
+    } else if (fandomName) {
+      fd.append('fandom_name', fandomName);
+    }
     const r = await fetch(`/image/${imageId}/tags/add`, { method: 'POST', body: fd });
     const j = await r.json();
     if (j.ok) {
@@ -615,6 +625,35 @@ document.addEventListener('DOMContentLoaded', () => {
     return false;
   }
 
+  // ---------------------------
+  // Fandom picker helpers
+  // ---------------------------
+  function clearFandomAutocomplete() {
+    if (fandomPickerAutocomplete) fandomPickerAutocomplete.innerHTML = '';
+  }
+
+  function clearFandomPicker() {
+    if (!fandomPickerInput) return;
+    fandomPickerInput.value = '';
+    delete fandomPickerInput.dataset.fandomId;
+    clearFandomAutocomplete();
+    fandomPickerWrapper?.classList.remove('visible');
+    fandomPickerWrapper?.setAttribute('aria-hidden', 'true');
+  }
+
+  function renderFandomAutocomplete(rows) {
+    if (!fandomPickerAutocomplete) return;
+    if (!rows || rows.length === 0) {
+      fandomPickerAutocomplete.innerHTML = '';
+      return;
+    }
+    fandomPickerAutocomplete.innerHTML = rows.map(r => {
+      const name = String(r.name || '').replace(/"/g, '"');
+      const displayName = String(r.display_name || r.name || '').replace(/</g, '&lt;');
+      return `<div class="tag-autocomplete-item" data-fandom-id="${r.id}" data-fandom-name="${name}">${displayName}</div>`;
+    }).join('');
+  }
+
   // ---------------------------
   // Autocomplete helpers
   // ---------------------------
@@ -681,8 +720,14 @@ document.addEventListener('DOMContentLoaded', () => {
     const id = getEditorImageId();
     const name = (tagInput?.value || '').trim();
     if (!id || !name) return;
-    await addTag(id, name);
+    const fandomId = fandomPickerInput?.dataset?.fandomId;
+    const fandomName = (fandomPickerInput?.value || '').trim();
+    const ok = await addTag(id, name, {
+      fandomId: fandomId ? Number(fandomId) : null,
+      fandomName: fandomName || null,
+    });
     if (tagInput) tagInput.value = '';
+    clearFandomPicker();
     // Reset the reserved area to the top-tags view so it's ready for the next add.
     fetchAutocomplete('');
   }
@@ -693,8 +738,22 @@ document.addEventListener('DOMContentLoaded', () => {
       fetchAutocomplete(tagInput.value.trim());
     });
 
-    // Search as user types.
+    // Search as user types + toggle the fandom picker when the shortcut is 'character:'.
     tagInput.addEventListener('input', () => {
+      const lower = (tagInput.value || '').toLowerCase();
+      const isCharacter = lower.startsWith('character:');
+      if (fandomPickerWrapper) {
+        fandomPickerWrapper.classList.toggle('visible', isCharacter);
+        fandomPickerWrapper.setAttribute('aria-hidden', String(!isCharacter));
+      }
+      if (!isCharacter) {
+        // Typing anything else cancels a previously-staged fandom id/name.
+        if (fandomPickerInput) {
+          fandomPickerInput.value = '';
+          delete fandomPickerInput.dataset.fandomId;
+          clearFandomAutocomplete();
+        }
+      }
       clearTimeout(autocompleteDebounce);
       autocompleteDebounce = setTimeout(() => {
         fetchAutocomplete(tagInput.value.trim());
@@ -742,6 +801,42 @@ document.addEventListener('DOMContentLoaded', () => {
     });
   }
 
+  if (fandomPickerInput) {
+    fandomPickerInput.addEventListener('input', () => {
+      clearTimeout(fandomPickerDebounce);
+      const term = fandomPickerInput.value.trim();
+      // Any typing invalidates a previously-selected fandom id.
+      delete fandomPickerInput.dataset.fandomId;
+      if (!term) {
+        clearFandomAutocomplete();
+        return;
+      }
+      fandomPickerDebounce = setTimeout(() => {
+        fetch(`/api/tags/search?kind=fandom&q=${encodeURIComponent(term)}&limit=8`)
+          .then(r => r.json())
+          .then(body => renderFandomAutocomplete(body.tags || []))
+          .catch(() => clearFandomAutocomplete());
+      }, 150);
+    });
+  }
+
+  if (fandomPickerAutocomplete) {
+    fandomPickerAutocomplete.addEventListener('mousedown', (e) => {
+      const row = e.target.closest('[data-fandom-id]');
+      if (!row) return;
+      e.preventDefault();  // keep focus on the input
+      if (fandomPickerInput) {
+        fandomPickerInput.value = row.dataset.fandomName;
+        fandomPickerInput.dataset.fandomId = row.dataset.fandomId;
+      }
+      clearFandomAutocomplete();
+    });
+  }
+
+  if (fandomPickerClear) {
+    fandomPickerClear.addEventListener('click', clearFandomPicker);
+  }
+
   if (tagForm) {
     tagForm.addEventListener('submit', async (e) => {
       e.preventDefault();
@@ -793,6 +888,7 @@ document.addEventListener('DOMContentLoaded', () => {
     // NEW: load tags for this image into the modal editor
     setEditorImageId(imageId);
     if (tagInput) tagInput.value = '';
+    clearFandomPicker();
     loadTags(imageId);
     loadSeriesInfo(imageId);
     // Prefill the reserved autocomplete area with top tags so it's never empty.
@@ -812,6 +908,7 @@ document.addEventListener('DOMContentLoaded', () => {
   }
 
   function closeModal() {
+    clearFandomPicker();
     // Get the image ID before clearing so we can refresh its tags
     const imageId = getEditorImageId();