feat(feedback): thumbs up/down + missed-items widget across all tools

New api/feedback.php stores rating + correction text to tool_feedback
table in bnl_admin. renderFeedbackWidget() appended to all tool results
(timeline, redact, transcribe, ask, summarize, search). Thumbs reveal
a textarea for missed/wrong items on click; submit POSTs asynchronously.
Engine from last run is stored alongside the rating.

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

assets/css/tools.css

@@ -1578,3 +1578,101 @@ p {
   opacity: 0.55;
   cursor: progress;
 }
+
+/* ── Feedback widget ──────────────────────────────────────────── */
+.feedback-widget {
+  margin-top: 1.5rem;
+  padding: 1rem 1.25rem;
+  border-top: 1px solid var(--line);
+}
+
+.feedback-label {
+  font-size: 0.85rem;
+  color: var(--muted);
+  margin: 0 0 0.6rem;
+}
+
+.feedback-btns {
+  display: flex;
+  gap: 0.5rem;
+  margin-bottom: 0.75rem;
+}
+
+.feedback-thumb {
+  background: var(--bg);
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  padding: 0.35rem 0.75rem;
+  font-size: 1.2rem;
+  cursor: pointer;
+  transition: background 0.12s, border-color 0.12s;
+  line-height: 1;
+}
+
+.feedback-thumb:hover { background: var(--soft-teal); border-color: var(--teal); }
+.feedback-thumb.is-active { background: var(--soft-teal); border-color: var(--teal); }
+
+.feedback-detail {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.feedback-detail-label {
+  font-size: 0.83rem;
+  color: var(--ink);
+  font-weight: 500;
+}
+
+.feedback-optional {
+  color: var(--muted);
+  font-weight: 400;
+}
+
+.feedback-textarea {
+  width: 100%;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  padding: 0.5rem 0.75rem;
+  font-size: 0.85rem;
+  resize: vertical;
+  font-family: inherit;
+  color: var(--ink);
+  background: var(--panel);
+}
+
+.feedback-textarea:focus { outline: 3px solid var(--teal); outline-offset: 1px; }
+
+.feedback-detail-footer {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+}
+
+.feedback-submit-btn {
+  background: var(--teal);
+  color: #fff;
+  border: none;
+  border-radius: 6px;
+  padding: 0.4rem 1rem;
+  font-size: 0.83rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: background 0.12s;
+}
+
+.feedback-submit-btn:hover { background: var(--teal-dark); }
+.feedback-submit-btn:disabled { opacity: 0.55; cursor: progress; }
+
+.feedback-status {
+  font-size: 0.8rem;
+  color: var(--muted);
+  margin: 0;
+}
+
+.feedback-thanks {
+  font-size: 0.85rem;
+  color: var(--teal-dark);
+  font-weight: 500;
+  margin: 0;
+}