Improve per proxy app selector

app/src/main/java/io/nekohasekai/sfa/ktx/Clips.kt

@@ -0,0 +1,12 @@
+package io.nekohasekai.sfa.ktx
+
+import android.content.ClipData
+import io.nekohasekai.sfa.Application
+
+var clipboardText: String?
+    get() = Application.clipboard.primaryClip?.getItemAt(0)?.text?.toString()
+    set(plainText) {
+        if (plainText != null) {
+            Application.clipboard.setPrimaryClip(ClipData.newPlainText(null, plainText))
+        }
+    }

app/src/main/java/io/nekohasekai/sfa/ktx/Intents.kt

@@ -1,12 +1,12 @@
 package io.nekohasekai.sfa.ktx
 
+import android.app.Activity
 import android.content.ActivityNotFoundException
 import androidx.activity.result.ActivityResultLauncher
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import io.nekohasekai.sfa.R
-import io.nekohasekai.sfa.ui.shared.AbstractActivity
 
-fun AbstractActivity.startFilesForResult(
+fun Activity.startFilesForResult(
     launcher: ActivityResultLauncher<String>, input: String
 ) {
     try {