implement to_string method, prevent memory index overwrite on validation step

src/profile/identity/error.rs

@@ -3,3 +3,16 @@ pub enum Error {
     Database(sqlite::Error),
     Gemini(super::gemini::Error),
 }
+
+impl Error {
+    pub fn to_string(&self) -> String {
+        match self {
+            Self::Database(reason) => {
+                format!("Database error: {}", reason.to_string())
+            }
+            Self::Gemini(reason) => {
+                format!("Could not init Gemini identity: {}", reason.to_string())
+            }
+        }
+    }
+}