Add genlocke transfer UI with transfer selection modal and backend support

When advancing to the next genlocke leg, users can now select surviving
Pokemon to transfer. Transferred Pokemon are bred down to their base
evolutionary form and appear as level-1 egg encounters in the next leg.
A GenlockeTransfer record links source and target encounters for lineage tracking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-lsdy--genlocke-cumulative-graveyard.md

@@ -1,11 +1,11 @@
 ---
 # nuzlocke-tracker-lsdy
 title: Genlocke cumulative graveyard
-status: in-progress
+status: completed
 type: feature
 priority: normal
 created_at: 2026-02-09T07:42:46Z
-updated_at: 2026-02-09T09:58:56Z
+updated_at: 2026-02-09T10:00:43Z
 parent: nuzlocke-tracker-25mh
 ---
 

.beans/nuzlocke-tracker-p74f--genlocke-transfer-ui.md

@@ -1,11 +1,11 @@
 ---
 # nuzlocke-tracker-p74f
 title: Genlocke transfer UI
-status: todo
+status: in-progress
 type: feature
 priority: normal
 created_at: 2026-02-09T07:42:33Z
-updated_at: 2026-02-09T07:46:06Z
+updated_at: 2026-02-09T10:14:34Z
 parent: nuzlocke-tracker-25mh
 blocking:
     - nuzlocke-tracker-lsc2