fix(startup): run MnemonicCache init synchronously to prevent race condition

The async coroutine launch allowed auth flow to access cachedCode before
initialization completed, causing UninitializedPropertyAccessException.

Signed-off-by: Brandon McAnsh <git@bmcreations.dev>

Author: bmc08gt

apps/flipcash/app/src/main/kotlin/com/flipcash/app/internal/startup/MnemonicCacheInitializer.kt

@@ -3,15 +3,10 @@ package com.flipcash.app.internal.startup
 import android.content.Context
 import androidx.startup.Initializer
 import com.getcode.crypt.MnemonicCache
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
 
 class MnemonicCacheInitializer: Initializer<Unit> {
     override fun create(context: Context) {
-        CoroutineScope(Dispatchers.IO).launch {
-            MnemonicCache.init(context)
-        }
+        MnemonicCache.init(context)
     }
 
     override fun dependencies(): List<Class<out Initializer<*>?>?> {