Render the pedigree top-down as a family tree

Replace the indented ancestry list with a top-down chart: the dog on top,
sire (left) and dam (right) branching below, connected by lines drawn with
each node's CSS ::before/::after (a nested <ul>/<li> tree). It shows three
generations by default and each dog expands to trace the line further back;
deeper levels get wide, so the view scrolls horizontally.

src/changelog.json

@@ -1,4 +1,5 @@
 [
+  { "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" },
   { "date": "2026-07-24", "text": "The age counter reads \"16 weeks (3 months and 3 weeks) old\" so weeks and months line up; past 4 months it drops the weeks and shows just months (e.g. \"5 months and 2 weeks old\")" },