feat(wave): implement Phase 1 Smart Wave recommendations and buffer rotation

app/static/app.js

@@ -297,4 +297,102 @@ document.addEventListener("DOMContentLoaded", () => {
     const d = new Date(isoStr);
     return d.toLocaleDateString() + " " + d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
   }
+
+  // --- Smart Wave Logic ---
+  const waveCountLabel = document.getElementById("waveCountLabel");
+  const waveSizeLabel = document.getElementById("waveSizeLabel");
+  const waveAnchorsContainer = document.getElementById("waveAnchorsContainer");
+  const waveAnchorsList = document.getElementById("waveAnchorsList");
+  const waveTracksList = document.getElementById("waveTracksList");
+  const waveLoadingText = document.getElementById("waveLoadingText");
+  const waveGenerateBtn = document.getElementById("waveGenerateBtn");
+  const waveRotateBtn = document.getElementById("waveRotateBtn");
+
+  fetchWaveStatus();
+
+  if (waveGenerateBtn) {
+    waveGenerateBtn.addEventListener("click", async () => {
+      waveGenerateBtn.disabled = true;
+      if (waveLoadingText) waveLoadingText.style.display = "inline-block";
+      try {
+        const res = await fetch("api/wave/generate", { method: "POST" });
+        const data = await res.json();
+        alert(`Волна обновлена! Добавлено: ${data.added_count || 0} треков.`);
+        await fetchWaveStatus();
+      } catch (err) {
+        alert("Ошибка генерации волны: " + err);
+      } finally {
+        waveGenerateBtn.disabled = false;
+        if (waveLoadingText) waveLoadingText.style.display = "none";
+      }
+    });
+  }
+
+  if (waveRotateBtn) {
+    waveRotateBtn.addEventListener("click", async () => {
+      waveRotateBtn.disabled = true;
+      try {
+        const res = await fetch("api/wave/rotate", { method: "POST" });
+        const data = await res.json();
+        const promMsg = (data.promoted_count > 0) ? `⭐ Перенесено в библиотеку: ${data.promoted_count}` : "Нет лайкнутых для переноса";
+        const purMsg = (data.purged_count > 0) ? `🗑️ Удалено устаревших: ${data.purged_count}` : "Нет устаревших";
+        alert(`Ротация завершена!\n${promMsg}\n${purMsg}`);
+        await fetchWaveStatus();
+      } catch (err) {
+        alert("Ошибка ротации: " + err);
+      } finally {
+        waveRotateBtn.disabled = false;
+      }
+    });
+  }
+
+  async function fetchWaveStatus() {
+    try {
+      const res = await fetch("api/wave/status");
+      const data = await res.json();
+      renderWaveStatus(data);
+    } catch (err) {
+      console.error("Wave status error:", err);
+    }
+  }
+
+  function renderWaveStatus(data) {
+    if (waveCountLabel) waveCountLabel.textContent = `${data.count || 0} / ${data.capacity || 25} треков`;
+    if (waveSizeLabel) waveSizeLabel.textContent = `${data.total_size_mb || 0} МБ`;
+
+    // Anchors
+    if (waveAnchorsContainer && waveAnchorsList) {
+      const anchors = data.anchor_artists || [];
+      if (anchors.length > 0) {
+        waveAnchorsContainer.style.display = "block";
+        waveAnchorsList.innerHTML = anchors.map(a => `<span class="tag-anchor">${escapeHtml(a)}</span>`).join("");
+      } else {
+        waveAnchorsContainer.style.display = "none";
+      }
+    }
+
+    // Tracks list
+    if (waveTracksList) {
+      const tracks = data.tracks || [];
+      if (tracks.length === 0) {
+        waveTracksList.innerHTML = `<p class="empty-state">Волна пуста. Нажмите «Обновить Волну» для генерации первого потока.</p>`;
+      } else {
+        waveTracksList.innerHTML = tracks.map(t => `
+          <div class="wave-track-item">
+            <div style="min-width: 0; display: flex; flex-direction: column; gap: 0.15rem;">
+              <strong style="font-size: 0.88rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;">${escapeHtml(t.title)}</strong>
+              <span style="font-size: 0.78rem; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;">
+                ${escapeHtml(t.artist)} • ${t.size_mb} МБ (${t.age_days} дн. назад)
+              </span>
+            </div>
+            <div style="display: flex; gap: 0.4rem; flex-shrink: 0;">
+              <button class="btn-play-preview" onclick="playPreviewTrack('${escapeAttr(t.path)}', '${escapeAttr(t.title)}', '${escapeAttr(t.artist)}', '', '', 'api/stream?url=' + encodeURIComponent('${escapeAttr(t.path)}'))">
+                ▶ Слушать
+              </button>
+            </div>
+          </div>
+        `).join("");
+      }
+    }
+  }
 });