Add .mdb import button and modal with server-side migration runner

public/css/style.css

@@ -311,3 +311,103 @@ td {
   margin-top: auto;
 }
 .form-actions .btn-primary { flex: 1; padding: 8px; }
+
+/* ── Import modal ── */
+.modal-overlay {
+  position: fixed;
+  inset: 0;
+  background: rgba(0,0,0,0.4);
+  z-index: 200;
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity 0.15s;
+}
+.modal-overlay.open { opacity: 1; pointer-events: auto; }
+
+.modal {
+  position: fixed;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -48%);
+  width: 480px;
+  max-width: calc(100vw - 2rem);
+  background: var(--surface);
+  border-radius: 6px;
+  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
+  z-index: 201;
+  display: flex;
+  flex-direction: column;
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity 0.15s, transform 0.15s;
+}
+.modal.open {
+  opacity: 1;
+  pointer-events: auto;
+  transform: translate(-50%, -50%);
+}
+
+.modal-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 10px 16px;
+  background: var(--header-bg);
+  color: var(--header-fg);
+  border-radius: 6px 6px 0 0;
+  flex-shrink: 0;
+}
+.modal-header h2 { font-size: 14px; font-weight: 600; }
+
+.modal-body {
+  padding: 16px;
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.modal-desc {
+  font-size: 12px;
+  color: var(--text-muted);
+  line-height: 1.5;
+}
+.modal-desc code {
+  font-family: monospace;
+  background: var(--bg);
+  padding: 1px 4px;
+  border-radius: 3px;
+}
+
+input[type="file"] {
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 6px 8px;
+  font-size: 13px;
+  font-family: var(--font);
+  width: 100%;
+  background: var(--surface);
+  cursor: pointer;
+}
+
+.import-log {
+  font-family: monospace;
+  font-size: 11px;
+  background: #0f172a;
+  color: #94a3b8;
+  border-radius: 4px;
+  padding: 10px 12px;
+  max-height: 200px;
+  overflow-y: auto;
+  white-space: pre-wrap;
+  word-break: break-all;
+  line-height: 1.5;
+}
+.import-log.success { color: #86efac; }
+.import-log.error   { color: #fca5a5; }
+
+.modal-footer {
+  display: flex;
+  gap: 8px;
+  padding: 12px 16px;
+  border-top: 1px solid var(--border);
+}

public/index.html

@@ -30,6 +30,7 @@
         Generate PDF <span id="selected-count" class="badge">0</span>
       </button>
       <button id="btn-new-check" class="btn-secondary">+ New Check</button>
+      <button id="btn-import" class="btn-secondary">Import .mdb</button>
     </div>
   </div>
 
@@ -117,6 +118,27 @@
     </form>
   </aside>
 
+  <!-- Import modal -->
+  <div id="import-modal-overlay" class="modal-overlay"></div>
+  <div id="import-modal" class="modal" role="dialog" aria-labelledby="import-modal-title">
+    <div class="modal-header">
+      <h2 id="import-modal-title">Import from .mdb</h2>
+      <button id="btn-close-import" class="btn-icon" title="Close">×</button>
+    </div>
+    <div class="modal-body">
+      <p class="modal-desc">Select an ezCheckPrinting <code>.mdb</code> file to import account settings, check layout, and check history. This will replace existing data.</p>
+      <div class="form-group">
+        <label for="import-file">File</label>
+        <input type="file" id="import-file" accept=".mdb">
+      </div>
+      <div id="import-log" class="import-log" hidden></div>
+    </div>
+    <div class="modal-footer">
+      <button id="btn-run-import" class="btn-primary">Import</button>
+      <button id="btn-cancel-import" class="btn-ghost">Cancel</button>
+    </div>
+  </div>
+
   <script src="/js/app.js"></script>
 </body>
 </html>

public/js/app.js

@@ -337,6 +337,65 @@ async function reprintCheck(id) {
   }
 }
 
+// ── Import modal ─────────────────────────────────────────────────────────────
+
+function openImportModal() {
+  document.getElementById('import-file').value = '';
+  const log = document.getElementById('import-log');
+  log.hidden = true;
+  log.textContent = '';
+  log.className = 'import-log';
+  document.getElementById('btn-run-import').disabled = false;
+  document.getElementById('btn-run-import').textContent = 'Import';
+  document.getElementById('import-modal-overlay').classList.add('open');
+  document.getElementById('import-modal').classList.add('open');
+}
+
+function closeImportModal() {
+  document.getElementById('import-modal-overlay').classList.remove('open');
+  document.getElementById('import-modal').classList.remove('open');
+}
+
+async function runImport() {
+  const fileInput = document.getElementById('import-file');
+  if (!fileInput.files.length) {
+    alert('Select an .mdb file first.');
+    return;
+  }
+
+  const btn = document.getElementById('btn-run-import');
+  btn.disabled = true;
+  btn.textContent = 'Importing…';
+
+  const log = document.getElementById('import-log');
+  log.hidden = false;
+  log.className = 'import-log';
+  log.textContent = 'Running import…';
+
+  const form = new FormData();
+  form.append('mdbfile', fileInput.files[0]);
+
+  try {
+    const res = await fetch('/api/import', { method: 'POST', body: form });
+    const data = await res.json();
+    log.textContent = data.log || '';
+    if (res.ok) {
+      log.classList.add('success');
+      btn.textContent = 'Done';
+      await Promise.all([loadAccount(), loadChecks()]);
+    } else {
+      log.classList.add('error');
+      btn.disabled = false;
+      btn.textContent = 'Retry';
+    }
+  } catch (err) {
+    log.classList.add('error');
+    log.textContent = err.message;
+    btn.disabled = false;
+    btn.textContent = 'Retry';
+  }
+}
+
 // ── Utilities ────────────────────────────────────────────────────────────────
 
 function escHtml(str) {
@@ -383,6 +442,13 @@ function init() {
   // Generate PDF
   document.getElementById('btn-generate-pdf').addEventListener('click', generatePdf);
 
+  // Import modal
+  document.getElementById('btn-import').addEventListener('click', openImportModal);
+  document.getElementById('btn-close-import').addEventListener('click', closeImportModal);
+  document.getElementById('btn-cancel-import').addEventListener('click', closeImportModal);
+  document.getElementById('import-modal-overlay').addEventListener('click', closeImportModal);
+  document.getElementById('btn-run-import').addEventListener('click', runImport);
+
   // Initial data load
   loadAccount();
   loadChecks();