fix: account switcher bottom sheet not showing logged-in accounts

DisplayAllAccounts collects from accountsFlow() which is a
MutableStateFlow initialized to null. The accounts are lazily loaded
from encrypted storage only when allSavedAccounts() is called, but
nothing in the account switcher triggers that load.

Add a LaunchedEffect that calls allSavedAccounts() when the flow
is still null, ensuring the account list is populated when the
bottom sheet opens.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/drawer/AccountSwitchBottomSheet.kt

@@ -120,6 +120,15 @@ private fun DisplayAllAccounts(
     accountSessionManager: AccountSessionManager,
 ) {
     val accounts by LocalPreferences.accountsFlow().collectAsStateWithLifecycle()
+
+    // Trigger lazy load from encrypted storage if the flow hasn't been populated yet.
+    // accountsFlow() starts as null and only gets a value when allSavedAccounts() is called.
+    LaunchedEffect(Unit) {
+        if (accounts == null) {
+            LocalPreferences.allSavedAccounts()
+        }
+    }
+
     accounts?.forEach { acc -> DisplayAccount(acc, accountViewModel, accountSessionManager) }
 }