Ensure RawCard size matches flash alignment requirements, add debug logs

src/card/decoder.rs

@@ -17,6 +17,7 @@ pub fn split_nfc_hex(payload: &[u8]) -> Option<RawCard> {
         packed_card_text: payload[0x2DB..0x311].try_into().ok()?,
         secret: payload[0x311..0x329].try_into().ok()?,
         _opaque_trailer: payload[0x329..0x35A].try_into().ok()?,
+        _padding: Default::default(),
     })
 }
 

src/card/model.rs

@@ -19,8 +19,11 @@ pub struct RawCard {
     pub packed_card_text: [u8; 54],
     pub secret: [u8; 24],
     pub _opaque_trailer: [u8; 49],
+    pub _padding: [u8; 2],
 }
 
+static_assertions::const_assert!(RawCard::SERIALIZED_SIZE.is_multiple_of(4));
+
 #[derive(Debug, Clone, Eq, PartialEq, FromPrimitive)]
 #[repr(u8)]
 pub enum CardType {