Pedigree: connector lines + correct 4-grandparent structure

Rebuilds the family view's pedigree as a recursive bracket chart with CSS connector lines — focus links to its two parents (2 lines), and each parent links to its two parents (4 lines to grandparents). Fixes the prior ambiguity where grandparent slots weren't tied to a specific parent: now every parent shows its own two parent slots, so a person clearly has up to four grandparents grouped by lineage. Height-robust connectors (each leaf draws its own spine half + stub).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Justin Paul <justin@jpaul.me>

frontend/app/globals.css

@@ -54,3 +54,55 @@ h3,
 ::selection {
   background: color-mix(in srgb, var(--color-bronze) 22%, transparent);
 }
+
+/* Pedigree bracket connectors (ancestors grow rightward). Each leaf draws its
+   own half of the vertical spine + a horizontal stub, so lines stay correct
+   regardless of box heights: focus → 2 parents, each parent → 2 grandparents. */
+.ped-person {
+  display: flex;
+  align-items: center;
+}
+.ped-self {
+  flex-shrink: 0;
+}
+.ped-branch {
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+  margin-left: 2.5rem;
+}
+.ped-branch::before {
+  content: "";
+  position: absolute;
+  left: -2.5rem;
+  top: 50%;
+  width: 2.5rem;
+  border-top: 1px solid var(--border);
+}
+.ped-leaf {
+  position: relative;
+  padding-left: 1.5rem;
+}
+.ped-leaf::before {
+  content: "";
+  position: absolute;
+  left: 0;
+  top: 50%;
+  width: 1.5rem;
+  border-top: 1px solid var(--border);
+}
+.ped-leaf::after {
+  content: "";
+  position: absolute;
+  left: 0;
+  top: 0;
+  bottom: 0;
+  border-left: 1px solid var(--border);
+}
+.ped-leaf:first-child::after {
+  top: 50%;
+}
+.ped-leaf:last-child::after {
+  bottom: 50%;
+}