Кнопка «Скачать» текущей версии фото (доступна при навигации по истории)

public/app.js

@@ -34,6 +34,7 @@ const resultLabel = document.querySelector("#result-label");
 const jobStatus = document.querySelector("#job-status");
 const jobStatusText = document.querySelector("#job-status-text");
 const downloadLink = document.querySelector("#download-link");
+const downloadCurrent = document.querySelector("#download-current");
 
 let currentVersionId = null;
 let historyVersions = [];
@@ -61,6 +62,37 @@ function formatFileSize(bytes) {
   return `${(bytes / (1024 * 1024)).toFixed(1)} МБ`;
 }
 
+function versionFileName(version) {
+  const kindName = {
+    original: "original",
+    edit: "edited",
+    upscale: "upscaled"
+  }[version.kind] || "photo";
+
+  let stamp = "";
+  try {
+    const d = new Date(version.createdAt);
+    stamp = `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
+  } catch {
+    stamp = "photo";
+  }
+
+  return `${kindName}-${stamp}.${version.ext || "jpg"}`;
+}
+
+function updateDownloadCurrent(version) {
+  if (!version) {
+    downloadCurrent.hidden = true;
+    downloadCurrent.removeAttribute("href");
+    downloadCurrent.removeAttribute("download");
+    return;
+  }
+
+  downloadCurrent.href = version.url;
+  downloadCurrent.download = versionFileName(version);
+  downloadCurrent.hidden = false;
+}
+
 function setHealthState(state, message, title = "") {
   healthStatus.className = `health-status health-${state}`;
   healthText.textContent = message;
@@ -201,6 +233,7 @@ async function selectFile(file) {
       file.name,
       `${formatFileSize(file.size)} · готово к обработке`
     );
+    updateDownloadCurrent(data.version);
     setJobStatus("", "");
     setBusy(false);
   } catch (error) {
@@ -299,6 +332,7 @@ async function runJob(kind) {
     if (version) {
       historyVersions.push(version);
       currentVersionId = version.id;
+      updateDownloadCurrent(version);
       renderHistory();
     }
 
@@ -428,6 +462,7 @@ function selectHistoryVersion(version) {
   currentVersionId = version.id;
 
   resetResult();
+  updateDownloadCurrent(version);
   showSourcePreviewFromUrl(
     version.url,
     version.label || "Версия",
@@ -455,6 +490,7 @@ async function loadHistoryOnStart() {
     if (historyVersions.length > 0) {
       const latest = historyVersions[historyVersions.length - 1];
       currentVersionId = latest.id;
+      updateDownloadCurrent(latest);
       showSourcePreviewFromUrl(
         latest.url,
         latest.label || "Текущая фотография",