feat(ai): integrate local Ollama AI for in-context sentence translation and caching (Task 13)

app/static/css/style.css

@@ -3858,6 +3858,10 @@ body {
     margin-bottom: 8px;
 }
 
+.popup-context-box {
+    margin-bottom: 14px;
+}
+
 .popup-context {
     font-size: 12px;
     color: var(--text-muted);
@@ -3865,11 +3869,101 @@ body {
     background: var(--bg-input);
     padding: 8px 10px;
     border-radius: var(--radius-sm);
-    margin-bottom: 14px;
+    margin-bottom: 6px;
     line-height: 1.4;
     border-left: 3px solid var(--primary);
 }
 
+.popup-sentence-ai-bar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 8px;
+    margin-bottom: 6px;
+}
+
+.popup-sentence-btn {
+    font-size: 11px;
+    padding: 3px 8px;
+    cursor: pointer;
+    border-radius: var(--radius-sm);
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.popup-ai-source-badge {
+    font-size: 10px;
+    font-weight: 600;
+    color: var(--primary);
+    background: rgba(99, 102, 241, 0.12);
+    border: 1px solid rgba(99, 102, 241, 0.25);
+    padding: 2px 6px;
+    border-radius: 9999px;
+    letter-spacing: 0.02em;
+}
+
+.popup-sentence-loading {
+    font-size: 11px;
+    color: var(--text-muted);
+    padding: 6px 8px;
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    background: var(--bg-input);
+    border-radius: var(--radius-sm);
+    margin-bottom: 6px;
+}
+
+.popup-sentence-translation-wrap {
+    background: rgba(99, 102, 241, 0.08);
+    border: 1px solid rgba(99, 102, 241, 0.2);
+    border-radius: var(--radius-sm);
+    padding: 8px 10px;
+    margin-bottom: 6px;
+    animation: fadeIn 0.15s ease-out;
+}
+
+.popup-sentence-ru {
+    font-size: 13px;
+    line-height: 1.45;
+    color: var(--text-main);
+    margin-bottom: 6px;
+}
+
+.popup-context-meaning-wrap {
+    display: flex;
+    align-items: center;
+    flex-wrap: wrap;
+    gap: 6px;
+    font-size: 11px;
+    padding-top: 6px;
+    border-top: 1px dashed rgba(99, 102, 241, 0.2);
+}
+
+.context-meaning-label {
+    color: var(--text-muted);
+}
+
+.context-meaning-val {
+    color: var(--success);
+    font-weight: 600;
+}
+
+.use-meaning-btn {
+    font-size: 10px;
+    padding: 1px 6px;
+    color: var(--primary);
+    border: 1px solid var(--primary);
+    border-radius: 4px;
+    cursor: pointer;
+    background: transparent;
+}
+
+.use-meaning-btn:hover {
+    background: rgba(99, 102, 241, 0.15);
+}
+
 .popup-saved-badge {
     text-align: center;
     font-size: 13px;

app/static/index.html

@@ -1062,7 +1062,26 @@
             <div id="popup-loading" class="popup-loading hidden">Переводим...</div>
             <div id="popup-content" class="popup-content">
                 <div class="popup-translation" id="popup-translation">перевод</div>
-                <div class="popup-context" id="popup-context">“Контекст из книги...”</div>
+                <div class="popup-context-box">
+                    <div class="popup-context" id="popup-context">“Контекст из книги...”</div>
+                    <div class="popup-sentence-ai-bar">
+                        <button type="button" id="popup-translate-sentence-btn" class="btn btn-xs btn-outline popup-sentence-btn" title="Перевести всё предложение через локальный ИИ">
+                            🌐 Перевести предложение
+                        </button>
+                        <span id="popup-ai-source-badge" class="popup-ai-source-badge hidden">⚡ Local AI</span>
+                    </div>
+                    <div id="popup-sentence-loading" class="popup-sentence-loading hidden">
+                        <span class="spinner-sm"></span> Локальный ИИ переводит...
+                    </div>
+                    <div id="popup-sentence-translation-wrap" class="popup-sentence-translation-wrap hidden">
+                        <div class="popup-sentence-ru" id="popup-sentence-ru"></div>
+                        <div id="popup-context-meaning-wrap" class="popup-context-meaning-wrap hidden">
+                            <span class="context-meaning-label">🎯 В контексте:</span>
+                            <strong id="popup-context-meaning-val" class="context-meaning-val"></strong>
+                            <button type="button" id="popup-use-context-meaning-btn" class="btn btn-xs btn-ghost use-meaning-btn" title="Использовать этот перевод для карточки">Вставить в карточку</button>
+                        </div>
+                    </div>
+                </div>
             </div>
         </div>
         <div class="popup-footer">

app/static/js/modules/api.js

@@ -66,11 +66,7 @@ export const api = {
             return resp.ok ? await resp.json() : [];
         },
         async lookup(term) {
-            const resp = await fetch(`/api/lookup?term=${encodeURIComponent(term)}`);
-            if (resp.ok) {
-                return await resp.json();
-            }
-            throw new Error(`Lookup failed: ${resp.status}`);
+            return await api.lookup.search(term);
         },
         async create(payload) {
             return await fetch('/api/cards', {
@@ -98,6 +94,35 @@ export const api = {
         }
     },
 
+    // Dictionary Lookup & AI Sentence Translation
+    lookup: {
+        async search(term) {
+            const resp = await fetch(`/api/lookup?term=${encodeURIComponent(term)}`);
+            if (resp.ok) {
+                return await resp.json();
+            }
+            throw new Error(`Lookup failed: ${resp.status}`);
+        },
+        async translateSentence(sentence, targetWord = '') {
+            const resp = await fetch('/api/translate-sentence', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({
+                    sentence: sentence,
+                    target_word: targetWord
+                })
+            });
+            if (resp.ok) {
+                return await resp.json();
+            }
+            throw new Error(`Sentence translation failed: ${resp.status}`);
+        },
+        async getAiStatus() {
+            const resp = await fetch('/api/ai/status');
+            return resp.ok ? await resp.json() : { online: false, models: [] };
+        }
+    },
+
     // Collections & Tags
     collections: {
         async getAll() {

app/static/js/modules/reader.js

@@ -1151,6 +1151,27 @@ export async function openWordPopup(term, contextSentence, targetElement) {
     if (popupLoading) popupLoading.classList.remove('hidden');
     if (popupContent) popupContent.classList.add('hidden');
 
+    const popupTranslateSentenceBtn = document.getElementById('popup-translate-sentence-btn');
+    const popupAiSourceBadge = document.getElementById('popup-ai-source-badge');
+    const popupSentenceLoading = document.getElementById('popup-sentence-loading');
+    const popupSentenceTranslationWrap = document.getElementById('popup-sentence-translation-wrap');
+    const popupSentenceRu = document.getElementById('popup-sentence-ru');
+    const popupContextMeaningWrap = document.getElementById('popup-context-meaning-wrap');
+    const popupContextMeaningVal = document.getElementById('popup-context-meaning-val');
+    const popupSentenceAiBar = document.querySelector('.popup-sentence-ai-bar');
+
+    if (popupSentenceLoading) popupSentenceLoading.classList.add('hidden');
+    if (popupSentenceTranslationWrap) popupSentenceTranslationWrap.classList.add('hidden');
+    if (popupSentenceRu) popupSentenceRu.textContent = '';
+    if (popupContextMeaningWrap) popupContextMeaningWrap.classList.add('hidden');
+    if (popupContextMeaningVal) popupContextMeaningVal.textContent = '';
+    if (popupAiSourceBadge) popupAiSourceBadge.classList.add('hidden');
+    if (popupTranslateSentenceBtn) {
+        popupTranslateSentenceBtn.disabled = false;
+        popupTranslateSentenceBtn.textContent = '🌐 Перевести предложение';
+        if (popupSentenceAiBar) popupSentenceAiBar.classList.toggle('hidden', !contextSentence);
+    }
+
     if (popupInLibrary) {
         popupInLibrary.classList.toggle('hidden', !existingCard);
     }
@@ -1831,6 +1852,78 @@ export function initReader() {
     window.addEventListener('scroll', schedulePopupUpdate, { passive: true, capture: true });
     window.addEventListener('resize', schedulePopupUpdate, { passive: true });
 
+    const popupTranslateSentenceBtn = document.getElementById('popup-translate-sentence-btn');
+    const popupUseContextMeaningBtn = document.getElementById('popup-use-context-meaning-btn');
+    const popupSentenceLoading = document.getElementById('popup-sentence-loading');
+    const popupSentenceTranslationWrap = document.getElementById('popup-sentence-translation-wrap');
+    const popupSentenceRu = document.getElementById('popup-sentence-ru');
+    const popupContextMeaningWrap = document.getElementById('popup-context-meaning-wrap');
+    const popupContextMeaningVal = document.getElementById('popup-context-meaning-val');
+    const popupAiSourceBadge = document.getElementById('popup-ai-source-badge');
+
+    if (popupTranslateSentenceBtn) {
+        popupTranslateSentenceBtn.addEventListener('click', async (e) => {
+            e.stopPropagation();
+            if (!popupCurrentData || !popupCurrentData.contextSentence) return;
+            const ctxSentence = popupCurrentData.contextSentence;
+            const term = popupCurrentData.term;
+
+            popupTranslateSentenceBtn.disabled = true;
+            if (popupSentenceLoading) popupSentenceLoading.classList.remove('hidden');
+            if (popupSentenceTranslationWrap) popupSentenceTranslationWrap.classList.add('hidden');
+            if (popupContextMeaningWrap) popupContextMeaningWrap.classList.add('hidden');
+
+            try {
+                const res = await api.lookup.translateSentence(ctxSentence, term);
+                if (popupSentenceLoading) popupSentenceLoading.classList.add('hidden');
+                if (popupSentenceTranslationWrap) popupSentenceTranslationWrap.classList.remove('hidden');
+
+                if (popupSentenceRu) {
+                    popupSentenceRu.textContent = res.sentence_ru || 'Перевод не получен';
+                }
+
+                if (res.word_meaning && res.word_meaning.trim()) {
+                    popupCurrentData.contextMeaning = res.word_meaning.trim();
+                    if (popupContextMeaningWrap) popupContextMeaningWrap.classList.remove('hidden');
+                    if (popupContextMeaningVal) popupContextMeaningVal.textContent = res.word_meaning.trim();
+                } else {
+                    if (popupContextMeaningWrap) popupContextMeaningWrap.classList.add('hidden');
+                }
+
+                if (popupAiSourceBadge) {
+                    popupAiSourceBadge.classList.remove('hidden');
+                    popupAiSourceBadge.textContent = res.cached ? '⚡ Кеш (0.01ms)' : '⚡ Local AI (Qwen)';
+                    popupAiSourceBadge.title = res.source || '';
+                }
+
+                positionWordPopup(popupCurrentData.targetElement);
+            } catch (err) {
+                console.error('Sentence translation error:', err);
+                if (popupSentenceLoading) popupSentenceLoading.classList.add('hidden');
+                if (popupSentenceTranslationWrap) popupSentenceTranslationWrap.classList.remove('hidden');
+                if (popupSentenceRu) popupSentenceRu.textContent = 'Ошибка связи с локальным ИИ';
+            } finally {
+                popupTranslateSentenceBtn.disabled = false;
+            }
+        });
+    }
+
+    if (popupUseContextMeaningBtn) {
+        popupUseContextMeaningBtn.addEventListener('click', (e) => {
+            e.stopPropagation();
+            if (!popupCurrentData || !popupCurrentData.contextMeaning) return;
+            const meaning = popupCurrentData.contextMeaning;
+            if (popupTranslation) popupTranslation.textContent = meaning;
+            if (popupCurrentData.lookup) {
+                popupCurrentData.lookup.translation = meaning;
+            }
+            popupUseContextMeaningBtn.textContent = '✓ Вставлено!';
+            setTimeout(() => {
+                if (popupUseContextMeaningBtn) popupUseContextMeaningBtn.textContent = 'Вставить в карточку';
+            }, 1800);
+        });
+    }
+
     if (popupSaveBtn) {
         popupSaveBtn.addEventListener('click', async () => {
             if (!popupCurrentData) return;