feat(properties): make the Hyperlink field editable

The General-group Hyperlink row becomes an editable text field; committing a
value writes the standard PE_URL XDATA record (an empty value clears it). Adds
scene::view::dispatch::set_common_xdata, which rebuilds an entity's XDATA to
replace or remove a single application record — ExtendedData only appends, so a
plain add_record would leave a stale duplicate the reader would pick first.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/scene/cache/properties.rs

@@ -85,7 +85,7 @@ pub fn general_section(entity: &EntityType) -> PropSection {
             Property {
                 label: "Hyperlink".into(),
                 field: "hyperlink",
-                value: PropValue::ReadOnly(hyperlink),
+                value: PropValue::EditText(hyperlink),
             },
         ],
     };