Add duplicate audio hash detection

serato_doctor/webui/layout-fixes.css

@@ -35,6 +35,46 @@
   font-size: 14px;
 }
 
+.review-signals {
+  display: flex;
+  align-items: flex-end;
+  gap: 7px;
+  flex-direction: column;
+}
+
+.hash-confidence {
+  display: inline-block;
+  padding: 5px 8px;
+  border-radius: 999px;
+  font-size: 9px!important;
+  font-style: normal;
+  font-weight: 750;
+  letter-spacing: .02em!important;
+  text-transform: none!important;
+}
+
+.hash-confidence.checking,
+.hash-confidence.unavailable {
+  color: var(--muted);
+  background: rgba(255, 255, 255, .05);
+}
+
+.hash-confidence.identical {
+  color: #8ce4b8;
+  background: rgba(84, 212, 154, .11);
+}
+
+.hash-confidence.different {
+  color: var(--amber);
+  background: rgba(245, 185, 76, .1);
+}
+
+.preview-decision > span .hash-confidence {
+  display: block;
+  width: max-content;
+  margin-top: 8px;
+}
+
 .review-candidates {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));