Implemented public form appearance settings.

src/error.rs

@@ -10,7 +10,8 @@ pub enum AppError {
     FatalError(String),
     SlotParseError,
     MailAddrParseErr(String),
-    MailSendError(String)
+    MailSendError(String),
+    FileIOError(String)
 }
 
 impl AppError {
@@ -21,7 +22,8 @@ impl AppError {
             AppError::FatalError(e) => {format!("Fatal error: {}", e)},
             AppError::SlotParseError => {"Book slot parse error".to_string()},
             AppError::MailAddrParseErr(e) => {format!("Cannot parse email address: {}", e)},
-            AppError::MailSendError(e) => {format!("Cannot send email: {}", e)}
+            AppError::MailSendError(e) => {format!("Cannot send email: {}", e)},
+            AppError::FileIOError(e) => {format!("IO error: {}", e)}
         }
     }
 }
@@ -79,4 +81,11 @@ impl From<lettre::transport::file::Error> for AppError {
     fn from(value: lettre::transport::file::Error) -> Self {
         AppError::MailSendError(value.to_string())
     }
+}
+
+#[cfg(feature = "ssr")]
+impl From<std::io::Error> for AppError {
+    fn from(value: std::io::Error) -> Self {
+        AppError::FileIOError(value.to_string())
+    }
 }