Remove legacy View-based UI

Keep only Compose UI, removing old View-based Activities, Fragments,
and layouts. QRScanActivity and PerAppProxyActivity are retained as
they are still used by Compose UI.

app/src/main/java/io/nekohasekai/sfa/LauncherActivity.kt

@@ -4,25 +4,13 @@ import android.app.Activity
 import android.content.Intent
 import android.os.Bundle
 import io.nekohasekai.sfa.compose.ComposeActivity
-import io.nekohasekai.sfa.database.Settings
-import io.nekohasekai.sfa.ui.MainActivity
-import kotlinx.coroutines.runBlocking
 
 class LauncherActivity : Activity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        val targetActivity =
-            if (BuildConfig.DEBUG) {
-                val useComposeUI = runBlocking { Settings.useComposeUI }
-                if (useComposeUI) ComposeActivity::class.java else MainActivity::class.java
-            } else {
-                ComposeActivity::class.java
-            }
-
         val launchIntent =
-            Intent(this, targetActivity).apply {
-                // Transfer any intent data from launcher
+            Intent(this, ComposeActivity::class.java).apply {
                 intent?.let {
                     action = it.action
                     data = it.data