fix(auth): replace deprecated NetworkInfo with NetworkCapabilities in LoginActivity

[William17738]

Summary

• Replace deprecated ConnectivityManager.getActiveNetworkInfo() with NetworkCapabilities API (Android M+) in LoginActivity.start()
• Retain fallback to NetworkInfo.isConnected() for Android versions below M
• No behavioral change on devices where the old API works correctly

Problem

On Android 14, getActiveNetworkInfo() returns null for non-system apps when the active connection is a VPN (e.g. Clash, v2ray). This causes the login screen to show the "no network" error even though the device has internet access.

This primarily affects users on stock ROMs (Honor, Huawei) where microG is installed as a user app rather than a system app. Custom ROM users are unaffected because microG is typically installed as a privileged system app, which has access to the deprecated API.

Fix

// Before (deprecated, fails on Android 14 with VPN):
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())

// After (works with VPN/proxy connections):
if (SDK_INT >= Build.VERSION_CODES.M) {
    Network network = cm.getActiveNetwork();
    NetworkCapabilities caps = cm.getNetworkCapabilities(network);
    return caps != null && caps.hasCapability(NET_CAPABILITY_INTERNET);
} else {
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();
    return networkInfo != null && networkInfo.isConnected();
}

Test plan

• Verify login works on Android 14 stock ROM (Honor/Huawei) with VPN active
• Verify login works on Android 14 stock ROM with WiFi only (no VPN)
• Verify login still shows "no network" error when truly offline
• Verify no regression on Android < M (fallback path)

Scope

This PR only touches LoginActivity.java. There are 3 other call sites using the same deprecated API (TriggerReceiver, McsService, gcm/TriggerReceiver) which could be addressed in a follow-up PR.

🤖 Generated with Claude Code

[ale5000-git]

Also according to the documentation NetworkCapabilities was added in API level 21 (Lollipop).