Automate App Store screenshots via XCUITests

Replace preview-based screenshot rendering with simulator XCUITests
driven by shooter.sh (per-language locale + status bar overrides,
xcparse extraction). Add batteries-list accessibility identifier and
update CLAUDE.md screenshot docs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cable/Batteries/BatteriesView.swift

@@ -249,6 +249,7 @@ struct BatteriesView: View {
         .listStyle(.plain)
         .scrollContentBackground(.hidden)
         .environment(\.editMode, $editMode)
+        .accessibilityIdentifier("batteries-list")
     }
 
     private func batteryRow(for battery: SavedBattery) -> some View {