Decode numeric character references in File Info XMP text

Found while testing crates/engine/src/file_cmds.rs:690 (xml_unescape), used by li_values, find_attr and read_file_info

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/engine/src/file_cmds.rs

@@ -657,7 +657,42 @@ fn xml_escape(s: &str) -> String {
 }
 
 fn xml_unescape(s: &str) -> String {
-    s.replace("&lt;", "<").replace("&gt;", ">").replace("&quot;", "\"").replace("&apos;", "'").replace("&amp;", "&")
+    let mut out = String::with_capacity(s.len());
+    let mut rest = s;
+    while let Some(i) = rest.find('&') {
+        out.push_str(&rest[..i]);
+        rest = &rest[i..];
+        let decoded = rest.find(';').filter(|&e| e <= 12).and_then(|e| {
+            let c = match &rest[1..e] {
+                "lt" => '<',
+                "gt" => '>',
+                "quot" => '"',
+                "apos" => '\'',
+                "amp" => '&',
+                n => {
+                    let n = n.strip_prefix('#')?;
+                    let code = match n.strip_prefix(['x', 'X']) {
+                        Some(h) => u32::from_str_radix(h, 16).ok()?,
+                        None => n.parse().ok()?,
+                    };
+                    char::from_u32(code)?
+                }
+            };
+            Some((c, e + 1))
+        });
+        match decoded {
+            Some((c, len)) => {
+                out.push(c);
+                rest = &rest[len..];
+            }
+            None => {
+                out.push('&');
+                rest = &rest[1..];
+            }
+        }
+    }
+    out.push_str(rest);
+    out
 }
 
 /// The element `<tag …>…</tag>` (first occurrence) as (start, end, inner).

crates/engine/tests/xmp_charref.rs

@@ -0,0 +1,10 @@
+use photocraft_engine::file_cmds::read_file_info;
+
+#[test]
+fn numeric_character_references_are_decoded() {
+    let xmp = "<x:xmpmeta xmlns:x=\"adobe:ns:meta/\"><rdf:RDF><rdf:Description>\
+        <dc:description><rdf:Alt><rdf:li xml:lang=\"x-default\">Line one&#xA;Line two &#169; &#38; co &#x41; &amp;#38;</rdf:li></rdf:Alt></dc:description>\
+        </rdf:Description></rdf:RDF></x:xmpmeta>";
+    let info = read_file_info(Some(xmp));
+    assert_eq!(info["description"], "Line one\nLine two © & co A &#38;");
+}