Treat PIN fields as sensitive (#81)

crates/storage/src/document.rs

@@ -684,7 +684,11 @@ fn classify(index: usize, line: &[u8]) -> EntryFieldMetadata {
         let kind = semantic_field_kind(name);
         return EntryFieldMetadata {
             kind,
-            sensitivity: EntrySensitivity::Ordinary,
+            sensitivity: if name.eq_ignore_ascii_case("pin") {
+                EntrySensitivity::Sensitive
+            } else {
+                EntrySensitivity::Ordinary
+            },
             name: Some(name.to_owned()),
             otp: None,
             diagnostic: std::str::from_utf8(&line[value_start..])