feat(auth): add web captcha handling

- replace manual captcha screen with WebView-based VK captcha flow
- handle captcha error 14 by showing the captcha overlay and retrying with success_token
- pass captcha redirect/result state through AppSettings
- remove old captcha ViewModel, navigation, validation, and DI
- add ACRA crash reporting
- add WIP message edit mode UI/state
- update Gradle wrapper, SDK config, and dependencies

core/datastore/src/main/kotlin/dev/meloda/fast/datastore/AppSettings.kt

@@ -4,13 +4,32 @@ import android.content.SharedPreferences
 import androidx.core.content.edit
 import dev.meloda.fast.common.model.DarkMode
 import dev.meloda.fast.common.model.LogLevel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
 import kotlin.properties.Delegates
 import kotlin.reflect.KClass
 
+sealed class CaptchaTokenResult {
+    data object Initial : CaptchaTokenResult()
+    data object Null : CaptchaTokenResult()
+    data object Cancelled : CaptchaTokenResult()
+    data class Success(val token: String) : CaptchaTokenResult()
+}
+
 object AppSettings {
 
     private var preferences: SharedPreferences by Delegates.notNull()
 
+    private val captchaResult = MutableStateFlow<CaptchaTokenResult>(CaptchaTokenResult.Initial)
+    fun getCaptchaResultFlow(): StateFlow<CaptchaTokenResult> = captchaResult.asStateFlow()
+    fun setCaptchaResult(result: CaptchaTokenResult) = captchaResult.update { result }
+
+    private val captchaRedirectUri = MutableStateFlow<String?>(null)
+    fun getCaptchaRedirectUriFlow() = captchaRedirectUri.asStateFlow()
+    fun setCaptchaRedirectUri(redirectUri: String?) = captchaRedirectUri.update { redirectUri }
+
     fun init(preferences: SharedPreferences) {
         this.preferences = preferences
     }