add bottom sheet

shared/src/commonMain/kotlin/su/reya/coop/Nostr.kt

@@ -83,6 +83,13 @@ class Nostr {
         client?.shutdown()
     }
 
+    fun exit() {
+        signer = null
+        deviceSigner = null
+        userPubkey = null
+        contactList = emptyList()
+    }
+
     suspend fun setKeySigner(keys: Keys) {
         try {
             signer = NostrSigner.keys(keys)

shared/src/commonMain/kotlin/su/reya/coop/NostrViewModel.kt

@@ -187,6 +187,14 @@ class NostrViewModel(
         // TODO: Implement import
     }
 
+    fun logout() {
+        viewModelScope.launch {
+            _hasSecret.value = false
+            _chatRooms.value = emptySet()
+            secretStore.clear("user_signer")
+            nostr.exit()
+        }
+    }
 
     fun getChatRooms() {
         viewModelScope.launch {