UI scene lifecycle migration

[Vabiel]

No description provided.

[Copilot]

Pull request overview

Migrates the iOS side of the plugin to properly support UIKit’s scene-based lifecycle (UISceneDelegate), while also tightening the project’s minimum platform/tooling requirements and fixing a couple of login/init edge cases.

Changes:

• Raise minimum requirements (Flutter >= 3.38, iOS >= 13) and bump package version to 3.1.0.
• iOS: add scene URL handling + improve view controller lookup for presenting VK SDK UI; fix init/login completion on authorization failure.
• Android: treat stored-token permission check failures as a signal to drop invalid tokens (while avoiding reset on connection errors).

Reviewed changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Updates documented minimum requirements (Flutter/iOS).
pubspec.yaml	Bumps package version and raises Flutter minimum SDK constraint.
ios/flutter_login_vk.podspec	Raises iOS deployment target to 13.0.
ios/Classes/SwiftFlutterLoginVkPlugin.swift	Adds UIScene URL handling; improves UI presentation controller lookup; fixes init/login completion behavior.
example/pubspec.lock	Updates example lockfile to match new package version and SDK constraints.
CHANGELOG.md	Adds 3.1.0 release notes describing breaking requirements and fixes.
android/src/main/kotlin/ru/innim/flutter_login_vk/MethodCallHandler.kt	Drops stored token when permission check fails (except for IO/connection errors).
.idea/libraries/Dart_SDK.xml	Updates local IDE Dart SDK library paths.
.github/workflows/publish.yml	Updates publish workflow Flutter version reference.
.github/workflows/analyze.yml	Updates CI analyze workflow Flutter version.
.fvmrc	Updates pinned Flutter version for FVM.

Files not reviewed (1)

• .idea/libraries/Dart_SDK.xml: Generated file

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