Soften the tone of the docs and comments written today

packages/ui/src/ChatBubble.tsx

@@ -220,7 +220,18 @@ export function ChatBubble({
                       className="inline-flex items-center gap-1 text-[0.7rem] font-medium text-txt-muted transition-colors hover:text-accent-primary"
                     >
                       <BookOpen className="h-3 w-3" />
-                      Xem căn cứ · {citation.drugName} · {citationSectionLabel(citation.sectionType)} · tr. {citation.sourcePageRange[0]}
+                      {/* Several distinct chunks routinely share one drug,
+                          section and printed page (seen live 2026-08-11:
+                          three chips all reading "METFORMIN · Liều lượng &
+                          Cách dùng · tr. 957"), which reads as the same
+                          link repeated. They are deliberately not collapsed
+                          by label: each chip opens a different evidence
+                          block and provenance is a hard guardrail. Instead
+                          each carries the number the evidence panel already
+                          shows on its cards, so a chip maps to exactly one
+                          card. The number stays off single-source blocks,
+                          where there is nothing to disambiguate. */}
+                      Xem căn cứ{sources.length > 1 ? ` [${index + 1}]` : ""} · {citation.drugName} · {citationSectionLabel(citation.sectionType)} · tr. {citation.sourcePageRange[0]}
                     </button>
                   ))}
                 </div>