fix: reset flow now fetches photo before deleting, shows preview + manual entry

- resetPhoto() now downloads the photo blob before calling the reset endpoint,
  then re-shows it in the detail view with preview and manual entry
- resetAndReupload() same treatment, with fallback to server fetch
- Added Reset button to ALL server results (not just duplicates)
- Preview in Previous Photos cards with lightbox (prev-thumb + openLightbox)

static/index.html

@@ -604,11 +604,37 @@ function renderPrevCard(p) {
 }
 
 async function resetPhoto(photoId) {
-  if (!confirm('Reset this entry? The photo will be deleted from the database and can be re-uploaded as new.')) return;
+  if (!confirm('Reset this entry and re-process from scratch?')) return;
+
+  // Find the card to get the original filename
+  const card = document.querySelector(`#reEng${photoId}`)?.closest('.prev-photo-card');
+  const filename = card?.querySelector('.prev-filename')?.textContent?.trim() || 'photo.jpg';
+
   try {
-    const resp = await fetch(`/api/photos/${photoId}/reset`, { method: 'POST' });
-    if (!resp.ok) throw new Error('Reset failed');
-    loadPreviousPhotos();
+    // 1. Fetch the original file BEFORE reset deletes it
+    const fileResp = await fetch(`/api/photos/${photoId}/file`);
+    if (!fileResp.ok) throw new Error('Could not load photo file');
+    const blob = await fileResp.blob();
+
+    // 2. Reset in DB (deletes DB record + file from disk)
+    const resetResp = await fetch(`/api/photos/${photoId}/reset`, { method: 'POST' });
+    if (!resetResp.ok) throw new Error('Reset failed');
+
+    // 3. Rebuild a File object and scan it like a fresh upload
+    const file = new File([blob], filename, { type: blob.type || 'image/jpeg' });
+    const photoData = await scanPhoto(file);
+    photoData.file = file;
+
+    // 4. Clear current state and add to gallery
+    resetAll();
+    allPhotos = [photoData];
+    updateSummary();
+    renderGallery();
+
+    // 5. Show the detail view with preview image + manual entry
+    showDetail(0);
+    document.getElementById('serverSection').style.display = 'none';
+    document.getElementById('detail').scrollIntoView({ behavior: 'smooth' });
   } catch (e) {
     alert('Reset failed: ' + e.message);
   }
@@ -618,9 +644,31 @@ async function resetAndReupload(photoId) {
   if (!photoId) { alert('No photo ID available'); return; }
   if (!confirm('Reset this entry and re-process as fresh?')) return;
   try {
+    // Try to use local file first, fall back to fetching from server
+    let file = null;
+    if (selectedIdx >= 0 && allPhotos[selectedIdx]?.file) {
+      file = allPhotos[selectedIdx].file;
+    } else {
+      const fileResp = await fetch(`/api/photos/${photoId}/file`);
+      if (fileResp.ok) {
+        const blob = await fileResp.blob();
+        file = new File([blob], 'photo.jpg', { type: blob.type || 'image/jpeg' });
+      }
+    }
+    if (!file) throw new Error('No photo file available');
+
     await fetch(`/api/photos/${photoId}/reset`, { method: 'POST' });
-    // Re-trigger the upload
-    uploadSelected();
+
+    // Scan and show in detail view
+    const photoData = await scanPhoto(file);
+    photoData.file = file;
+    resetAll();
+    allPhotos = [photoData];
+    updateSummary();
+    renderGallery();
+    showDetail(0);
+    document.getElementById('serverSection').style.display = 'none';
+    document.getElementById('detail').scrollIntoView({ behavior: 'smooth' });
   } catch (e) {
     alert('Reset failed: ' + e.message);
   }
@@ -905,6 +953,12 @@ async function uploadSelected() {
       '<div id="manualResult" style="margin-top:4px;"></div>' +
     '</div>';
 
+    // Reset button — always available to start fresh
+    html += '<div style="margin-top:10px;padding-top:10px;border-top:1px solid var(--border);text-align:center;">' +
+      '<button class="btn btn-outline btn-xs" onclick="resetAndReupload(' + (data.photo_id || 'null') + ')" style="color:var(--amber);border-color:var(--amber);">🔄 Reset & Re-process from scratch</button>' +
+      '<div style="font-size:10px;color:var(--text3);margin-top:4px;">Clears DB entry and lets you re-analyze with manual entry</div>' +
+    '</div>';
+
     div.innerHTML = html;
   } catch (e) {
     div.innerHTML = '<div class="empty">❌ Upload failed: ' + esc(e.message) + '</div>';