feat: Add reset functionality and localize Toast messages in WebAppIntegration

- Implemented a "Reset" button with a confirmation dialog in WebAppIntegrationScreen.
- Added resetWebAppIntegration() to WebAppIntegrationViewModel to clear stored credentials.
- Localized all Toast messages in WebAppIntegrationViewModel by using string resources.
- Added corresponding string resources and German translations.

app/src/main/java/de/lxtools/noteshop/ui/webapp/WebAppIntegrationScreen.kt

@@ -7,6 +7,10 @@ import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.foundation.layout.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
@@ -63,5 +67,40 @@ fun WebAppIntegrationScreen(
         ) {
             Text(stringResource(R.string.save_and_test_connection_button))
         }
+
+        Spacer(modifier = Modifier.height(8.dp)) // Add some space between buttons
+
+        var showResetConfirmationDialog by remember { mutableStateOf(false) }
+
+        Button(
+            onClick = { showResetConfirmationDialog = true },
+            modifier = Modifier.fillMaxWidth(),
+            colors = ButtonDefaults.buttonColors(containerColor = MaterialTheme.colorScheme.error)
+        ) {
+            Text(stringResource(R.string.reset_web_app_integration))
+        }
+
+        if (showResetConfirmationDialog) {
+            AlertDialog(
+                onDismissRequest = { showResetConfirmationDialog = false },
+                title = { Text(stringResource(R.string.reset_web_app_integration)) },
+                text = { Text(stringResource(R.string.reset_web_app_integration_confirmation)) },
+                confirmButton = {
+                    Button(
+                        onClick = {
+                            viewModel.resetWebAppIntegration()
+                            showResetConfirmationDialog = false
+                        }
+                    ) {
+                        Text(stringResource(R.string.delete)) // Using existing "Delete" string for confirmation
+                    }
+                },
+                dismissButton = {
+                    TextButton(onClick = { showResetConfirmationDialog = false }) {
+                        Text(stringResource(R.string.cancel))
+                    }
+                }
+            )
+        }
     }
 }

app/src/main/java/de/lxtools/noteshop/ui/webapp/WebAppIntegrationViewModel.kt

@@ -68,7 +68,7 @@ class WebAppIntegrationViewModel(private val repository: NoteshopRepository, app
                         password = String(decrypted)
                     }
                 } catch (e: Exception) {
-                    Toast.makeText(getApplication(), "Failed to decrypt credentials", Toast.LENGTH_SHORT).show()
+                    Toast.makeText(getApplication(), getApplication<Application>().getString(de.lxtools.noteshop.R.string.failed_to_decrypt_credentials), Toast.LENGTH_SHORT).show()
                 }
             }
         }
@@ -77,7 +77,7 @@ class WebAppIntegrationViewModel(private val repository: NoteshopRepository, app
     fun saveAndTestConnection() {
         viewModelScope.launch {
             if (deletePassword.isBlank()) {
-                Toast.makeText(getApplication(), "Deletion password cannot be empty", Toast.LENGTH_SHORT).show()
+                Toast.makeText(getApplication(), getApplication<Application>().getString(de.lxtools.noteshop.R.string.deletion_password_cannot_be_empty), Toast.LENGTH_SHORT).show()
                 return@launch
             }
 
@@ -101,4 +101,22 @@ class WebAppIntegrationViewModel(private val repository: NoteshopRepository, app
             }
         }
     }
+
+    fun resetWebAppIntegration() {
+        viewModelScope.launch {
+            webAppUrl = ""
+            username = ""
+            password = ""
+            deletePassword = ""
+
+            sharedPrefs.edit().apply {
+                remove("webapp_url")
+                remove("username_encrypted")
+                remove("password_encrypted")
+                remove("key_pass")
+                apply()
+            }
+            Toast.makeText(getApplication(), getApplication<Application>().getString(de.lxtools.noteshop.R.string.web_app_integration_reset_successful), Toast.LENGTH_SHORT).show()
+        }
+    }
 }

app/src/main/res/values-de/strings.xml

@@ -297,4 +297,9 @@
     <string name="import_from_web_app">Von Web-App importieren</string>
     <string name="connection_successful">Verbindung erfolgreich und Zugangsdaten gespeichert</string>
     <string name="import_successful">Artikel erfolgreich importiert</string>
+    <string name="reset_web_app_integration">Web-App-Integration zurücksetzen</string>
+    <string name="reset_web_app_integration_confirmation">Möchten Sie die Web-App-Integration wirklich zurücksetzen? Dadurch werden alle gespeicherten Anmeldeinformationen gelöscht.</string>
+    <string name="web_app_integration_reset_successful">Web-App-Integration erfolgreich zurückgesetzt</string>
+    <string name="failed_to_decrypt_credentials">Fehler beim Entschlüsseln der Zugangsdaten</string>
+    <string name="deletion_password_cannot_be_empty">Löschpasswort darf nicht leer sein</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -297,4 +297,9 @@
     <string name="import_from_web_app">Import from Web App</string>
     <string name="connection_successful">Connection successful and credentials saved</string>
     <string name="import_successful">Items imported successfully</string>
+    <string name="reset_web_app_integration">Reset Web App Integration</string>
+    <string name="reset_web_app_integration_confirmation">Are you sure you want to reset the Web App Integration? This will delete all stored credentials.</string>
+    <string name="web_app_integration_reset_successful">Web App Integration reset successfully</string>
+    <string name="failed_to_decrypt_credentials">Failed to decrypt credentials</string>
+    <string name="deletion_password_cannot_be_empty">Deletion password cannot be empty</string>
 </resources>