feat(redact): tag highlighting, inventory panel, before/after toggle, gpt-4o upgrade

- CSS: colour-coded [TAG] spans by entity type (person=pink, org=blue,
  place=green, date=amber, id=purple)
- Inventory panel: collapsible list showing tag → original text mappings
  with occurrence counts, sourced from new redaction_map API response key
- Before/after toggle: Redacted / Original view-switch buttons wired to
  lastOriginalText captured at submission time
- One-click gpt-4o upgrade button when mini or GPU engine was used
- Backend: redaction_map built from applied LLM entities (tag → originals
  + occurrence count via substr_count on final text)
- renderResults now calls setupRedactViewToggle() after DOM is written

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

assets/css/tools.css

@@ -897,6 +897,115 @@ p {
   line-height: 1.55;
 }
 
+/* ── Redact: tag highlighting ── */
+.redact-tag {
+  display: inline;
+  border-radius: 4px;
+  padding: 1px 4px;
+  font-weight: 600;
+  font-size: 0.88em;
+}
+.redact-tag--person { background: #fce7f3; color: #9d174d; }
+.redact-tag--org    { background: #dbeafe; color: #1e40af; }
+.redact-tag--place  { background: #dcfce7; color: #166534; }
+.redact-tag--date   { background: #fef3c7; color: #92400e; }
+.redact-tag--id     { background: #ede9fe; color: #5b21b6; }
+
+/* ── Redact: view toggle ── */
+.redact-view-toggle {
+  display: flex;
+  gap: 6px;
+  margin-bottom: 8px;
+}
+.view-btn {
+  padding: 4px 14px;
+  border-radius: 999px;
+  border: 1px solid var(--line);
+  background: transparent;
+  color: var(--muted);
+  font-size: 0.82em;
+  cursor: pointer;
+  transition: background 0.15s, color 0.15s;
+}
+.view-btn.is-active {
+  background: var(--ink);
+  color: #fff;
+  border-color: var(--ink);
+}
+
+/* ── Redact: inventory panel ── */
+.redact-inventory {
+  margin: 10px 0 6px;
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  overflow: hidden;
+}
+.redact-inventory summary {
+  padding: 8px 12px;
+  cursor: pointer;
+  font-size: 0.85em;
+  font-weight: 600;
+  color: var(--muted);
+  background: #fafafa;
+  list-style: none;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+.redact-inventory summary::-webkit-details-marker { display: none; }
+.inv-badge {
+  background: var(--line);
+  color: var(--muted);
+  border-radius: 999px;
+  padding: 1px 7px;
+  font-size: 0.8em;
+  font-weight: 700;
+}
+.inv-list {
+  list-style: none;
+  padding: 8px 12px;
+  margin: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  background: #fff;
+}
+.inv-list li {
+  display: flex;
+  align-items: baseline;
+  gap: 6px;
+  font-size: 0.84em;
+  flex-wrap: wrap;
+}
+.inv-originals { color: var(--muted); }
+.inv-originals em { font-style: normal; color: var(--ink); font-weight: 500; }
+.inv-count {
+  margin-left: auto;
+  color: var(--muted);
+  font-size: 0.82em;
+  white-space: nowrap;
+}
+
+/* ── Redact: upgrade engine button ── */
+.upgrade-engine-btn {
+  display: block;
+  margin: 10px 0 4px;
+  background: none;
+  border: 1px dashed var(--line);
+  border-radius: 8px;
+  padding: 8px 14px;
+  font-size: 0.83em;
+  color: var(--muted);
+  cursor: pointer;
+  width: 100%;
+  text-align: left;
+  transition: border-color 0.15s, color 0.15s;
+}
+.upgrade-engine-btn:hover {
+  border-color: var(--ink);
+  color: var(--ink);
+}
+
 .pill-list {
   display: flex;
   flex-wrap: wrap;

assets/js/tools.js

@@ -1317,6 +1317,8 @@ function renderResults(data) {
   els.results.innerHTML = sections.join('');
   setupFeedbackWidget(data.tool || state.activeTool);
 
+  if (data.tool === 'redact') setupRedactViewToggle();
+
   const sortDoc = document.getElementById('sortDocOrder');
   const sortChr = document.getElementById('sortChronological');
   if (sortDoc && sortChr) {

includes/LegalTools.php

@@ -512,6 +512,7 @@ PROMPT;
         $finalRedacted = $preRedacted;
         $pass2Counts   = [];
         $llmDeployment = null;
+        $redactionMap  = [];
 
         $llmResult = $this->llmRedactionPass(
             $preRedacted, $language, $aliases, $engine,
@@ -527,6 +528,7 @@ PROMPT;
             $entities      = $llmResult['entities'] ?? [];
             $llmDeployment = $llmResult['deployment'] ?? null;
             $applied       = 0;
+            $redactionMap  = [];
 
             foreach ($entities as $entity) {
                 if (!is_array($entity)) {
@@ -549,14 +551,32 @@ PROMPT;
                     $finalRedacted = $replaced;
                     $pass2Counts[$type] = ($pass2Counts[$type] ?? 0) + 1;
                     $applied++;
+                    if (!isset($redactionMap[$tag])) {
+                        $redactionMap[$tag] = ['originals' => [], 'type' => $type];
+                    }
+                    if (!in_array($original, $redactionMap[$tag]['originals'], true)) {
+                        $redactionMap[$tag]['originals'][] = $original;
+                    }
                 } elseif (str_contains($finalRedacted, $original)) {
                     // Fallback for names adjacent to punctuation or non-word characters
                     $finalRedacted = str_replace($original, $tag, $finalRedacted);
                     $pass2Counts[$type] = ($pass2Counts[$type] ?? 0) + 1;
                     $applied++;
+                    if (!isset($redactionMap[$tag])) {
+                        $redactionMap[$tag] = ['originals' => [], 'type' => $type];
+                    }
+                    if (!in_array($original, $redactionMap[$tag]['originals'], true)) {
+                        $redactionMap[$tag]['originals'][] = $original;
+                    }
                 }
             }
 
+            // Add occurrence counts by scanning the final text
+            foreach ($redactionMap as $tag => &$entry) {
+                $entry['occurrences'] = substr_count($finalRedacted, $tag);
+            }
+            unset($entry);
+
             $pass2Detail = $applied > 0
                 ? "{$applied} additional: " . implode(', ', array_map(fn($k, $v) => "{$k}: {$v}", array_keys($pass2Counts), $pass2Counts))
                 : 'no additional entities found';
@@ -592,6 +612,7 @@ PROMPT;
             'redacted_text'              => $finalRedacted,
             'detected_entity_categories' => $categories,
             'entity_counts'              => $allCounts,
+            'redaction_map'              => $redactionMap,
             'evidence_trail'             => [['title' => 'Pasted text', 'excerpt' => 'Processed in-memory only; not stored.']],
             'what_remains_uncertain'     => ['Human review is still recommended for contextual identification.'],
             'next_practical_step'        => 'Review the output and rerun in strict mode if the text will be shared broadly.',