Redact: collapsible advanced settings, download TXT/DOCX/copy

- Wrap Mode/Region/Entities/Officials/Output/Exempt/Aliases in a
  <details> toggle so the form opens clean with only engine + input visible
- After redaction: Copy, Download .txt, Download .docx buttons appear
  below the redacted output (all four languages translated)
- New api/redact-download.php: returns plain text or a minimal valid
  DOCX built from scratch with ZipArchive (no external dependencies)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/css/tools.css

@@ -1470,3 +1470,71 @@ p {
   accent-color: var(--teal);
   cursor: pointer;
 }
+
+/* ─── Advanced settings panel (Redact tool) ───────────────────────────────── */
+
+.advanced-panel {
+  border-top: 1px solid var(--line);
+  margin-top: 0.6rem;
+}
+
+.advanced-toggle {
+  display: flex;
+  align-items: center;
+  gap: 0.4rem;
+  padding: 0.55rem 0;
+  font-size: 0.82rem;
+  font-weight: 500;
+  color: var(--teal);
+  cursor: pointer;
+  user-select: none;
+  list-style: none;
+}
+
+.advanced-toggle::-webkit-details-marker { display: none; }
+
+.advanced-toggle::before {
+  content: '▸';
+  font-size: 0.7rem;
+  transition: transform 0.18s ease;
+  display: inline-block;
+}
+
+.advanced-panel[open] .advanced-toggle::before {
+  transform: rotate(90deg);
+}
+
+.advanced-panel[open] .advanced-toggle {
+  margin-bottom: 0.5rem;
+}
+
+/* ─── Redact download buttons ─────────────────────────────────────────────── */
+
+.redact-downloads {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.5rem;
+  margin-top: 1rem;
+}
+
+.redact-dl-btn {
+  padding: 0.38rem 0.9rem;
+  border-radius: 6px;
+  font-size: 0.82rem;
+  font-weight: 500;
+  background: var(--soft-teal);
+  color: var(--teal-dark);
+  border: 1px solid rgba(15, 118, 110, 0.2);
+  cursor: pointer;
+  transition: background 0.15s, border-color 0.15s;
+}
+
+.redact-dl-btn:hover {
+  background: #d0ede9;
+  border-color: var(--teal);
+}
+
+.redact-dl-btn:disabled {
+  opacity: 0.55;
+  cursor: progress;
+}