feat: implement Display for LoadMismatch

crates/wallet/src/wallet/mod.rs

@@ -232,6 +232,28 @@ pub enum LoadMismatch {
     },
 }
 
+impl fmt::Display for LoadMismatch {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            LoadMismatch::Network { loaded, expected } => {
+                write!(f, "Network mismatch: loaded {}, expected {}", loaded, expected)
+            }
+            LoadMismatch::Genesis { loaded, expected } => {
+                write!(f, "Genesis hash mismatch: loaded {}, expected {}", loaded, expected)
+            }
+            LoadMismatch::Descriptor { keychain, loaded, expected } => {
+                write!(
+                    f,
+                    "Descriptor mismatch for {} keychain: loaded {}, expected {}",
+                    keychain, 
+                    loaded.as_ref().map_or("None".to_string(), |d| d.to_string()),
+                    expected.as_ref().map_or("None".to_string(), |d| d.to_string())
+                )
+            }
+        }
+    }
+}
+
 impl From<LoadMismatch> for LoadError {
     fn from(mismatch: LoadMismatch) -> Self {
         Self::Mismatch(mismatch)