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/app/update/command.rs

@@ -1460,6 +1460,20 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                                                 entity, field, &val,
                                             );
                                         }
+                                        "hyperlink" => {
+                                            // Stored in the standard PE_URL XDATA
+                                            // record; an empty value clears it.
+                                            let vals = if val.trim().is_empty() {
+                                                None
+                                            } else {
+                                                Some(vec![acadrust::xdata::XDataValue::String(
+                                                    val.clone(),
+                                                )])
+                                            };
+                                            crate::scene::view::dispatch::set_common_xdata(
+                                                entity, "PE_URL", vals,
+                                            );
+                                        }
                                         _ => {
                                             crate::scene::view::dispatch::apply_geom_prop(
                                                 entity, field, &val,

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),
             },
         ],
     };

src/scene/view/dispatch.rs

@@ -85,6 +85,34 @@ pub fn apply_common_prop(entity: &mut EntityType, field: &str, value: &str) {
     }
 }
 
+/// Replace — or, when `values` is `None`, remove — the single XDATA record for
+/// application `app` on an entity's common data, preserving every other record
+/// and the verbatim DWG EED blob. `ExtendedData` only appends, so a plain
+/// `add_record` would leave a stale duplicate that the reader picks first;
+/// rebuilding the collection is the only way to edit or clear a record.
+pub fn set_common_xdata(
+    entity: &mut EntityType,
+    app: &str,
+    values: Option<Vec<acadrust::xdata::XDataValue>>,
+) {
+    let common = entity.common_mut();
+    let mut rebuilt = acadrust::xdata::ExtendedData::new();
+    for r in common.extended_data.records() {
+        if r.application_name != app {
+            rebuilt.add_record(r.clone());
+        }
+    }
+    if let Some(vals) = values {
+        let mut rec = acadrust::xdata::ExtendedDataRecord::new(app);
+        for v in vals {
+            rec.add_value(v);
+        }
+        rebuilt.add_record(rec);
+    }
+    rebuilt.raw_dwg_eed = common.extended_data.raw_dwg_eed.clone();
+    common.extended_data = rebuilt;
+}
+
 /// The extrusion thickness (DXF 39) of the entities that carry one, or `None`
 /// for entity types that have none. Thickness is a per-entity field but is
 /// surfaced in the General group (as in a standard properties palette), so