Replace native Android AlertDialog with Flutter showDialog

[Copilot]

The warning dialog was implemented in Java via a MethodChannel, coupling the UI to the Android native layer. This moves all dialog logic to Dart using Flutter's built-in showDialog, and ports all upstream localizations into a Flutter-native localization class.

Changes

• lib/free_droid_warn.dart: Removed MethodChannel. showWarningOnUpgrade now accepts a BuildContext and renders a Flutter AlertDialog directly. Version tracking uses shared_preferences; URL launching uses url_launcher with canLaunchUrl guard. Dialog strings are resolved from the device locale via FreeDroidWarnLocalizations.of(context).
• lib/src/free_droid_warn_localizations.dart: New file containing all translations ported from the upstream Android XML string resources. Supports Arabic, Czech, German, Greek, English, Spanish, French, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Dutch, Polish, Portuguese, Russian, Slovak, Swedish, Turkish, Chinese Simplified, and Chinese Traditional. Falls back to English for unsupported languages. Chinese variants are resolved by scriptCode first (Hans/Hant), then by country code (TW, HK, MO → Traditional; all others → Simplified).
• pubspec.yaml: Added shared_preferences: ^2.2.2 and url_launcher: ^6.2.0.
• android/.../FreeDroidWarnPlugin.java: Reduced to a no-op FlutterPlugin stub — all dialog, SharedPreferences, and Activity logic removed.
• example/lib/main.dart: Updated call sites to pass BuildContext as the new first parameter.

API change

// Before
FreeDroidWarn.showWarningOnUpgrade(buildVersion);

// After — BuildContext required for Flutter dialog
FreeDroidWarn.showWarningOnUpgrade(context, buildVersion);

Note: Existing users who dismissed the dialog under the old native implementation will see it once more after upgrading, because the Flutter shared_preferences key (flutter.versionCodeWarn) differs from the Android-native key (free_droid_warn / versionCodeWarn).

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[MeowTechOpenSource]

@copilot Add back the localozations from upstream.

[Copilot]

@copilot Add back the localozations from upstream.

Done in commit 42dfaf5. Added lib/src/free_droid_warn_localizations.dart containing all 19 translations (ar, cs, de, el, es, fr, hi, hu, id, it, ja, ko, nl, pl, pt, ru, sk, sv, tr + en fallback) ported verbatim from the upstream Android XML string resources. showWarningOnUpgrade now calls FreeDroidWarnLocalizations.of(context) to pick the right strings for the device locale before showing the dialog, falling back to English for unsupported languages.

[MeowTechOpenSource]

Add back zh different localozations by pulling from the upstream repo. @copilot

[Copilot]

Add back zh different localozations by pulling from the upstream repo. @copilot

Done in commit 1e86ac6. Added zh-Hans (Simplified) and zh-Hant (Traditional) to FreeDroidWarnLocalizations, with strings pulled verbatim from the upstream woheller69/FreeDroidWarn repo. The locale is resolved by checking scriptCode first (Hans/Hant), then falling back to country code — TW, HK, and MO map to Traditional; all other zh locales (e.g. CN, SG) map to Simplified.