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/Sources/PrivacyInfo.xcprivacy

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0"><dict>
+    <key>NSPrivacyTracking</key><false/>
+    <key>NSPrivacyTrackingDomains</key><array/>
+    <key>NSPrivacyCollectedDataTypes</key><array/>
+    <key>NSPrivacyAccessedAPITypes</key><array>
+        <dict><key>NSPrivacyAccessedAPIType</key><string>NSPrivacyAccessedAPICategoryUserDefaults</string>
+        <key>NSPrivacyAccessedAPITypeReasons</key><array><string>CA92.1</string></array></dict>
+    </array>
+</dict></plist>