Flag pedigree collapse with repeat badges

When a dog fills more than one position in the pedigree (pedigree collapse),
mark each copy with a ×N badge and a stable per-dog colour, and let tapping
any copy highlight every place that dog appears. Identity is the registration
number (falling back to name), so the same ancestor at different positions is
treated as one. The summary line also reports how many ancestors recur.

src/changelog.json

@@ -1,4 +1,5 @@
 [
+  { "date": "2026-07-26", "text": "In the pedigree, a dog that fills more than one spot (pedigree collapse, common in a breed's older lines) now carries a ×N badge — tap it to highlight every place that dog appears in the tree" },
   { "date": "2026-07-26", "text": "The pedigree now reads top-down like a family tree — your dog on top with its sire and dam branching below — showing three generations at a glance, with each dog expandable to trace the line further back" },
   { "date": "2026-07-26", "text": "The pedigree ID set in Settings now syncs reliably to your other devices — it's no longer dropped when two devices' clocks disagree" },
   { "date": "2026-07-26", "text": "New 🌳 Pedigree page: add your dog's SKK chip or registration number in Settings to unlock it, then explore its ancestry as a tree — the first generations show at once and the line fills in further back as it's traced from SKK Hunddata. It's cached, so it reopens instantly and works offline" },