Redact: multi-doc upload, contextual person naming, aliases

- Extract limit raised from 32K to 128K chars per file (long legal docs now fit)
- Redact API body/text limits raised (400KB / 128K chars) to match
- Upload zone accepts multiple files (up to 5); extracted text concatenated with
  doc separator and combined before redaction; shows per-file char counts
- LLM redact pass now infers contextual person roles (FATHER, MOTHER, CHILD,
  ATTORNEY, JUDGE, etc.) instead of generic [PERSON] for all names; same
  individual gets consistent tag throughout the document
- Tag validation widened to allow any [A-Za-z0-9_- ] pattern (not just the
  five hardcoded tags), supporting contextual and alias tags
- Alias UI added to Redact mode: user maps real names to bracketed aliases
  (e.g. "David Jr" -> [Junior]); aliases injected into LLM system prompt as
  override instructions; max 20 aliases, 100 chars each
- max_tokens raised from 2000 to 4000; timeout from 60s to 90s for larger docs

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

assets/css/tools.css

@@ -963,3 +963,113 @@ p {
   color: var(--coral);
   border-color: #f5c6aa;
 }
+
+/* ─── Multi-file list ─────────────────────────────────────────────────────── */
+
+.upload-file-list {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+  text-align: left;
+  width: 100%;
+}
+
+.upload-file-list li {
+  display: flex;
+  align-items: baseline;
+  gap: 0.5rem;
+  padding: 2px 0;
+  font-size: 0.85rem;
+}
+
+.upload-chars {
+  color: var(--muted);
+  font-size: 0.78rem;
+  flex-shrink: 0;
+}
+
+/* ─── Name aliases (Redact tool) ──────────────────────────────────────────── */
+
+.alias-section {
+  margin-top: 0.75rem;
+  padding-top: 0.75rem;
+  border-top: 1px solid var(--line);
+}
+
+.alias-header {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+  margin-bottom: 0.5rem;
+}
+
+.alias-add-btn {
+  background: var(--soft-teal);
+  color: var(--teal-dark);
+  border: 1px solid transparent;
+  border-radius: 6px;
+  padding: 3px 10px;
+  font-size: 0.8rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: background 0.12s;
+}
+
+.alias-add-btn:hover {
+  background: #c4ece5;
+}
+
+.alias-row {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-bottom: 0.4rem;
+}
+
+.alias-original,
+.alias-label {
+  flex: 1;
+  padding: 0.3rem 0.55rem;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  font-size: 0.875rem;
+  background: var(--panel);
+  color: var(--ink);
+  min-width: 0;
+}
+
+.alias-original:focus,
+.alias-label:focus {
+  outline: 3px solid rgba(15, 118, 110, 0.28);
+  outline-offset: 1px;
+  border-color: var(--teal);
+}
+
+.alias-arrow {
+  color: var(--muted);
+  font-size: 1rem;
+  flex-shrink: 0;
+}
+
+.alias-remove {
+  flex-shrink: 0;
+  background: transparent;
+  color: var(--muted);
+  font-size: 1.1rem;
+  line-height: 1;
+  padding: 2px 6px;
+  border-radius: 4px;
+  border: 1px solid transparent;
+}
+
+.alias-remove:hover {
+  background: var(--soft-coral);
+  color: var(--coral);
+  border-color: #f5c6aa;
+}
+
+.alias-hint {
+  font-size: 0.76rem;
+  color: var(--muted);
+  margin: 0.35rem 0 0;
+}