fix(file_store)!: remove Debug usage and implement Display for StoreError.

Format magic bytes as 0x-prefixed hex.

Author: Dmenec

crates/file_store/src/lib.rs

@@ -26,11 +26,18 @@ pub enum StoreError {
 impl core::fmt::Display for StoreError {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         match self {
-            Self::Io(e) => write!(f, "io error trying to read file: {e}"),
-            Self::InvalidMagicBytes { got, expected } => write!(
-                f,
-                "file has invalid magic bytes: expected={expected:?} got={got:?}",
-            ),
+            Self::Io(e) => write!(f, "io error trying to read file: {}", e),
+            Self::InvalidMagicBytes { got, expected } => {
+                write!(f, "file has invalid magic bytes: expected=0x")?;
+                for b in expected {
+                    write!(f, "{:02x}", b)?;
+                }
+                write!(f, " got=0x")?;
+                for b in got {
+                    write!(f, "{:02x}", b)?;
+                }
+                Ok(())
+            }
             Self::Bincode(e) => write!(f, "bincode error while reading entry {e}"),
         }
     }