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/style.css

@@ -1123,59 +1123,111 @@ section.collapsed > :not(h2) { display: none; }
 .ped-subject-name { font-size: 1.15rem; font-weight: 700; }
 .ped-subject-meta { font-size: 0.85rem; color: var(--muted); margin-top: 2px; }
 
-/* the tree */
+/* Top-down family tree: the dog on top, parents branching below, connected by
+   lines drawn with each <li>'s ::before/::after (the classic CSS tree). Wider
+   than the screen once expanded, so the container scrolls horizontally. */
 .pedigree-tree {
   overflow-x: auto;
-  padding-bottom: 24px;
+  padding: 8px 0 28px;
 }
-.ped-node { position: relative; }
+.ped-tree-h, .ped-tree-h ul {
+  display: flex;
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+.ped-tree-h {
+  /* "safe" centers when the tree fits and falls back to start-aligned (no
+     clipped/unreachable left edge) once it's wider than the screen. */
+  justify-content: safe center;
+  min-width: max-content;
+  padding: 4px 16px 12px;
+}
+.ped-tree-h ul {
+  justify-content: center;
+  position: relative;
+  padding-top: 22px;    /* room for the connector from the parent above */
+}
+.ped-tree-h li {
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 22px 6px 0;
+}
+/* Elbow from each child up to the horizontal bar shared by its siblings. */
+.ped-tree-h li::before,
+.ped-tree-h li::after {
+  content: "";
+  position: absolute;
+  top: 0;
+  width: 50%;
+  height: 22px;
+  border-top: 2px solid var(--border);
+}
+.ped-tree-h li::before { right: 50%; }
+.ped-tree-h li::after  { left: 50%; border-left: 2px solid var(--border); }
+/* Vertical drop from a parent card down to its children's bar. */
+.ped-tree-h ul::before {
+  content: "";
+  position: absolute;
+  top: 0;
+  left: 50%;
+  height: 22px;
+  border-left: 2px solid var(--border);
+}
+/* A lone parent connects with a straight line, no elbow. */
+.ped-tree-h li:only-child::before,
+.ped-tree-h li:only-child::after { display: none; }
+/* Trim the outer half-lines at the ends of a sibling row. */
+.ped-tree-h li:first-child::before,
+.ped-tree-h li:last-child::after { border: 0 none; }
+.ped-tree-h li:last-child::before { border-right: 2px solid var(--border); }
+/* The dog sits on top with no connector above it. */
+.ped-tree-h > li { padding-top: 0; }
+.ped-tree-h > li::before,
+.ped-tree-h > li::after { display: none; }
+/* Collapsed: hide the ancestry below this dog (and its connectors go with it). */
+.ped-tree-h li.collapsed > ul { display: none; }
+
 .ped-card {
   position: relative;
-  display: inline-block;
-  padding: 6px 24px 6px 28px;
-  margin: 3px 0;
+  width: 140px;
+  box-sizing: border-box;
+  padding: 7px 18px 7px 20px;
   border: 1px solid var(--border);
   border-radius: 10px;
   background: var(--surface);
   box-shadow: var(--shadow);
+  text-align: center;
 }
-.ped-name { font-weight: 600; font-size: 0.95rem; }
+.ped-name { font-weight: 600; font-size: 0.85rem; line-height: 1.2; }
 .ped-name.ped-unknown { color: var(--muted); font-weight: 500; font-style: italic; }
-.ped-titles { font-size: 0.72rem; color: var(--accent); margin-top: 1px; }
+.ped-titles { font-size: 0.66rem; color: var(--accent); margin-top: 2px; line-height: 1.2; }
 .ped-reg {
-  font-size: 0.72rem;
+  font-size: 0.66rem;
   color: var(--muted);
   font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
   margin-top: 1px;
 }
-
-/* lineage spine: children indented under the card */
-.ped-children {
-  margin-left: 16px;
-  padding-left: 14px;
-  border-left: 2px solid var(--border);
-}
-.ped-node.collapsed > .ped-children { display: none; }
-
-/* sire ♂ (blue) above dam ♀ (purple) markers on the parent-role cards */
-.ped-sire > .ped-card { border-left: 3px solid var(--sleep); }
-.ped-dam  > .ped-card { border-left: 3px solid var(--training); }
+/* sire ♂ (blue) / dam ♀ (purple) accents on the parent cards */
+.ped-sire > .ped-card { border-top: 3px solid var(--sleep); }
+.ped-dam  > .ped-card { border-top: 3px solid var(--training); }
 .ped-sire > .ped-card::after,
 .ped-dam  > .ped-card::after {
   position: absolute;
-  right: 7px;
-  top: 6px;
-  font-size: 0.75rem;
+  right: 6px;
+  top: 5px;
+  font-size: 0.72rem;
 }
 .ped-sire > .ped-card::after { content: "♂"; color: var(--sleep); }
 .ped-dam  > .ped-card::after { content: "♀"; color: var(--training); }
 
-/* expand/collapse toggle */
+/* expand/collapse toggle (top-left of the card) */
 .ped-toggle {
   position: absolute;
-  left: 6px;
-  top: 50%;
-  transform: translateY(-50%);
+  left: 5px;
+  top: 5px;
   width: 18px; height: 18px;
   padding: 0;
   font-size: 0.9rem;