feat(materials): Фаза 5 — заметка в флешкарты

Кнопка «В флешкарты» на карточке-заметке: выбор колоды (или новая «Из материалов») →
создание карточки (front=заголовок, back=текст) через существующий API флешкард.
Хелперы fcListDecks/fcCreateDeck/fcAddCard в js/api.js.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/my-materials.html

@@ -108,6 +108,8 @@
     const edit = `<button class="mm-btn" onclick="editMaterial(${m.id})" title="Изменить"><i data-lucide="pencil"></i></button>`;
     const ann  = (m.kind === 'board' || m.kind === 'image')
       ? `<button class="mm-btn" onclick="annotate(${m.id})" title="Аннотировать (рисовать поверх)"><i data-lucide="pencil-ruler"></i></button>` : '';
+    const fc   = (m.kind === 'note')
+      ? `<button class="mm-btn" onclick="toFlashcard(${m.id})" title="В флешкарты"><i data-lucide="copy"></i></button>` : '';
     const mv   = moveSelect(m);
     if (m.kind === 'board' || m.kind === 'image') {
       return `<div class="mm-card">
@@ -132,7 +134,7 @@
         <div class="mm-card-body">
           <div class="mm-card-title">${esc(m.title || kind)}</div>
           <div class="mm-card-meta">${meta}</div>
-          <div class="mm-card-actions">${mv}${edit}${del}</div>
+          <div class="mm-card-actions">${mv}${fc}${edit}${del}</div>
         </div>
       </div>`;
     }
@@ -351,6 +353,38 @@
   }
   window.annotate = annotate;
 
+  /* ── Заметка → флешкарта ── */
+  async function toFlashcard(id) {
+    const mt = _mats.find(x => x.id === id);
+    if (!mt) return;
+    let decks = [];
+    try { const d = await LS.fcListDecks(); decks = d.decks || []; } catch (e) {}
+    const opts = ['<option value="__new">+ Новая колода «Из материалов»</option>']
+      .concat(decks.map(d => `<option value="${d.id}">${esc(d.title)}</option>`)).join('');
+    const front = (mt.title || '').trim() || (mt.body || '').slice(0, 80);
+    const back  = (mt.body || '').trim() || (mt.title || '');
+    const content = `<div style="display:flex;flex-direction:column;gap:8px">
+      <label style="font-size:.8rem;color:var(--text-3)">Колода</label>
+      <select id="fc-deck" style="${FLD}">${opts}</select>
+      <label style="font-size:.8rem;color:var(--text-3)">Вопрос (лицевая сторона)</label>
+      <input id="fc-front" value="${esc(front)}" style="${FLD}" />
+      <label style="font-size:.8rem;color:var(--text-3)">Ответ (оборот)</label>
+      <textarea id="fc-back" rows="4" style="${FLD};resize:vertical">${esc(back)}</textarea>
+    </div>`;
+    const m = LS.modal({ title: 'В флешкарты', content, size: 'sm', actions: [
+      { label: 'Отмена', onClick: () => m.close() },
+      { label: 'Создать карточку', primary: true, onClick: async () => {
+        try {
+          let deckId = m.body.querySelector('#fc-deck').value;
+          if (deckId === '__new') { const nd = await LS.fcCreateDeck({ title: 'Из материалов' }); deckId = nd.id; }
+          await LS.fcAddCard(deckId, { front: m.body.querySelector('#fc-front').value, back: m.body.querySelector('#fc-back').value });
+          m.close(); LS.toast('Карточка добавлена в флешкарты', 'success');
+        } catch (e) { LS.toast(e.message || 'Ошибка', 'error'); }
+      } },
+    ] });
+  }
+  window.toFlashcard = toFlashcard;
+
   load();
 </script>
 </body>

js/api.js

@@ -1050,6 +1050,7 @@ window.LS = {
   crAdminGetAllHistory, crAdminGetTeachersList,
   listMaterials, saveMaterial, updateMaterial, deleteMaterial,
   createMaterialCollection, updateMaterialCollection, deleteMaterialCollection,
+  fcListDecks, fcCreateDeck, fcAddCard,
   escapeHtml, esc,
   parseDate, fmtRelTime, safeHref,
   initPage,
@@ -1251,6 +1252,9 @@ async function deleteMaterial(id)     { return req('DELETE', `/materials/${id}`)
 async function createMaterialCollection(d)   { return req('POST',   '/materials/collections', d); }
 async function updateMaterialCollection(id,d){ return req('PATCH',  `/materials/collections/${id}`, d); }
 async function deleteMaterialCollection(id)  { return req('DELETE', `/materials/collections/${id}`); }
+async function fcListDecks()         { return req('GET',  '/flashcards/decks'); }
+async function fcCreateDeck(d)       { return req('POST', '/flashcards/decks', d); }
+async function fcAddCard(deckId, d)  { return req('POST', `/flashcards/decks/${deckId}/cards`, d); }
 async function deleteFile(id)                        { return req('DELETE', `/files/${id}`); }
 async function getFileAccess(id)                     { return req('GET',    `/files/${id}/access`); }
 async function assignFile(id, data)                  { return req('POST',   `/files/${id}/assign`, data); }