feat(get-user): expose Hamkar menu icon brand colors

Emit menu_icon_color and menu_icon_active_color when brandManaged so apps can theme nav icons separately.

Co-authored-by: Cursor <cursoragent@cursor.com>

prisma/seed-hamkar-default-snapshots.ts

@@ -170,6 +170,12 @@ async function main() {
       backgroundColor: restore
         ? keepSnapshot.brand?.backgroundColor
         : existing?.brand?.backgroundColor ?? brandBackground,
+      menuIconColor: restore
+        ? keepSnapshot.brand?.menuIconColor
+        : existing?.brand?.menuIconColor ?? null,
+      menuIconActiveColor: restore
+        ? keepSnapshot.brand?.menuIconActiveColor
+        : existing?.brand?.menuIconActiveColor ?? null,
       settingsManaged: Boolean(existing?.settingsManaged),
       brandManaged: Boolean(existing?.brandManaged),
       registryMode: restore