Add Regrade: instant re-run when photos are stored, fallback re-pick otherwise

Stores the original photo(s) for every card graded from now on, so an
existing history row can be re-graded in place without re-uploading -- most
useful right after a grading-logic fix like the last few commits. Cards
graded before this feature (or saved without images) fall back to the same
photo picker as a fresh grade, then start getting instant regrades from then
on. list_grades/get_grade now select an explicit column list rather than
SELECT * so the stored images are never pulled into memory just to be
discarded for the browser-facing response.

static/app.js

@@ -363,7 +363,11 @@ function renderHistory() {
         g.estimated_grade === null ? 'n/a' : `PSA ${g.estimated_grade}`}</span></td>
       <td class="cardcell-meta">${esc(g.confidence || '')}</td>
       <td class="cardcell-meta">${esc(fmtWhen(g.created_at))}</td>
-      <td class="num"><button class="btn btn-quiet btn-sm" data-history-delete="${g.id}">Delete</button></td>
+      <td class="num">
+        <button class="btn btn-quiet btn-sm" data-history-regrade="${g.id}"
+                data-history-has-images="${g.has_source_images ? '1' : '0'}">Regrade</button>
+        <button class="btn btn-quiet btn-sm" data-history-delete="${g.id}">Delete</button>
+      </td>
     </tr>`).join('');
 }
 
@@ -380,6 +384,8 @@ function renderEntryModal(g) {
       <input class="input" id="entry-label" placeholder="Rename this card…" value="${esc(g.label || '')}" style="flex:1 1 200px">
       <button class="btn btn-quiet btn-sm" id="entry-save-label">Save name</button>
       <span class="spacer"></span>
+      <button class="btn btn-quiet btn-sm" data-history-regrade="${g.id}"
+              data-history-has-images="${g.has_source_images ? '1' : '0'}">Regrade</button>
       <button class="btn btn-danger btn-sm" data-history-delete="${g.id}">Delete</button>
     </div>`;
   $('#entry-modal').hidden = false;
@@ -391,6 +397,64 @@ function closeEntryModal() {
   $('#entry-scrim').hidden = true;
 }
 
+/* --------------------------------------------------------------- regrade */
+//
+// Instant when the card's original photo(s) were saved (everything graded
+// from now on); otherwise falls back to picking the photo(s) again, same as
+// grading fresh, just updating this row instead of creating a new one.
+
+let regradeTargetId = null;
+
+function applyRegradeResult(g) {
+  const idx = state.history.findIndex((row) => row.id === g.id);
+  if (idx === -1) state.history.unshift(g); else state.history[idx] = g;
+  // created_at was bumped server-side to reflect the just-finished regrade,
+  // so re-sort to match — otherwise the card sits wherever it used to be
+  // until the next full reload.
+  state.history.sort((a, b) =>
+    (b.created_at || '').localeCompare(a.created_at || '') || b.id - a.id);
+  renderHistory();
+  const openDelete = $('#entry-modal').querySelector('[data-history-delete]');
+  if (!$('#entry-modal').hidden && openDelete && Number(openDelete.dataset.historyDelete) === g.id) {
+    renderEntryModal(g);
+  }
+}
+
+async function runRegrade(id, body) {
+  banner('Regrading…');
+  try {
+    const data = await api(`/api/history/${id}/regrade`, { method: 'POST', body });
+    applyRegradeResult(data.grade);
+    banner('Regraded.');
+  } catch (err) {
+    banner(`Regrade failed: ${err.message}`, true);
+  }
+}
+
+function startRegrade(id, hasImages) {
+  if (hasImages) {
+    runRegrade(id, {});
+  } else {
+    regradeTargetId = id;
+    $('#regrade-file').click();
+  }
+}
+
+$('#regrade-file').addEventListener('change', async (e) => {
+  const id = regradeTargetId;
+  regradeTargetId = null;
+  if (!id) return;
+  let picked;
+  try {
+    picked = await readPickedImages(e.target, 6);
+  } catch (err) {
+    banner(err.message, true);
+    return;
+  }
+  if (!picked.length) return;
+  await runRegrade(id, { images: pickedToPayload(picked) });
+});
+
 $('#history-body').addEventListener('click', async (e) => {
   const del = e.target.closest('[data-history-delete]');
   if (del) {
@@ -399,6 +463,12 @@ $('#history-body').addEventListener('click', async (e) => {
     await loadHistory();
     return;
   }
+  const regrade = e.target.closest('[data-history-regrade]');
+  if (regrade) {
+    e.stopPropagation();
+    startRegrade(Number(regrade.dataset.historyRegrade), regrade.dataset.historyHasImages === '1');
+    return;
+  }
   const row = e.target.closest('[data-history-row]');
   if (row) {
     try {
@@ -419,6 +489,11 @@ $('#entry-modal').addEventListener('click', async (e) => {
     await loadHistory();
     return;
   }
+  const regrade = e.target.closest('[data-history-regrade]');
+  if (regrade) {
+    startRegrade(Number(regrade.dataset.historyRegrade), regrade.dataset.historyHasImages === '1');
+    return;
+  }
   if (e.target.closest('#entry-save-label')) {
     const id = $('#entry-modal').querySelector('[data-history-delete]').dataset.historyDelete;
     const label = $('#entry-label').value.trim();