feat: add iOS support and harden receipt scanning

app/ios/ScanReceipts/Design/ZenithDivider.swift

@@ -0,0 +1,13 @@
+import SwiftUI
+
+/// A 1px rule in the system's one border color — `DESIGN (1).md` →
+/// Components → Lists: "Separated by 1px horizontal dividers in #E2E8F0."
+/// Prefer this over the bare `Divider()`, whose color/weight follow the
+/// system theme rather than this app's fixed palette.
+struct ZenithDivider: View {
+    var body: some View {
+        Rectangle()
+            .fill(Color.zenithBorder)
+            .frame(height: 1)
+    }
+}