feat(ios): implement SwiftUI companion with isolated WKWebView sessions

Add HTTPS onboarding, origin policy, native recovery/settings, isolated web sign-in and file export. Portable production URL policy tests pass on Linux; all Swift sources parse. Xcode build and simulator validation remain required on macOS.

ios/UITests/OnboardingTests.swift

@@ -0,0 +1,15 @@
+import XCTest
+
+final class OnboardingTests: XCTestCase {
+    func testRejectsCleartextWithoutNetwork() {
+        let app = XCUIApplication()
+        app.launch()
+        let field = app.textFields["Yuvomi server URL"]
+        XCTAssertTrue(field.waitForExistence(timeout: 5))
+        field.tap()
+        field.typeText("http://family.example")
+        app.buttons["Connect securely"].tap()
+        XCTAssertTrue(app.staticTexts["connectionError"].waitForExistence(timeout: 3))
+        XCTAssertTrue(field.exists)
+    }
+}