Fix ANR risk: offload ContentResolver and ProfileManager I/O off the main thread

[Copilot]

ContentResolver.openOutputStream/openInputStream and ProfileManager.serializeToJson/createProfilesFromJson (SQLite) were called directly on the main thread inside ActivityResultCallback lambdas, risking ANR when the content provider or storage is slow.

Changes

• ProfilesFragment (mobile): wrap importOrReplaceProfiles and exportProfiles callbacks in lifecycleScope.launch { withContext(Dispatchers.IO) { … } }; includes serializeToJson and createProfilesFromJson DB calls
• MainPreferenceFragment (tv): same fix for replaceProfiles and exportProfiles callbacks
• Added lifecycleScope, Dispatchers, launch, withContext imports to both files

UI error feedback (snackbar / Toast) stays on the main thread after withContext returns.

// Before
private val exportProfiles = registerForActivityResult(SaveJson) { data ->
    if (data != null) ProfileManager.serializeToJson()?.let { profiles ->
        activity.contentResolver.openOutputStream(data)!!.bufferedWriter().use {
            it.write(profiles.toString(2))
        }
    }
}

// After
private val exportProfiles = registerForActivityResult(SaveJson) { data ->
    if (data != null) lifecycleScope.launch {
        val activity = activity as MainActivity
        try {
            withContext(Dispatchers.IO) {
                ProfileManager.serializeToJson()?.let { profiles ->
                    activity.contentResolver.openOutputStream(data)!!.bufferedWriter().use {
                        it.write(profiles.toString(2))
                    }
                }
            }
        } catch (e: Exception) {
            Timber.w(e)
            activity.snackbar(e.readableMessage).show()
        }
    }
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.foojay.io
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java -Xmx64m -Xms64m -Dorg.gradle.appname=gradlew -classpath \"\" -jar /home/REDACTED/work/shadowsocks-android/shadowsocks-android/gradle/wrapper/gradle-wrapper.jar :mobile:compileDebugKotlin :tv:compileDebugKotlin (dns block)
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java -Xmx64m -Xms64m -Dorg.gradle.appname=gradlew -classpath \"\" -jar /home/REDACTED/work/shadowsocks-android/shadowsocks-android/gradle/wrapper/gradle-wrapper.jar :mobile:compileDebugKotlin :tv:compileDebugKotlin (dns block)
  • Triggering command: /usr/lib/jvm/temurin-21-jdk-amd64/bin/java /usr/lib/jvm/temurin-21-jdk-amd64/bin/java -Xmx64m -Xms64m -Dorg.gradle.appname=gradlew -classpath \"\" -jar /home/REDACTED/work/shadowsocks-android/shadowsocks-android/gradle/wrapper/gradle-wrapper.jar :mobile:compileDebugKotlin :tv:compileDebugKotlin -Dorg.gradle.java.home=/usr/lib/jvm/temurin-21-jdk-amd64 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)