feat(annotative): scale text/dims/tables/blocks at the annotation scale + editable property pickers

Render: annotative-ness is resolved centrally in scene::annotative::is_annotative
(per-object context dictionary, legacy XDATA, or annotative style) so the bake and
the properties panel agree. Text, dimensions, tables and blocks now display at the
current annotation scale in model space. An annotative block scales as one uniform
unit about its insertion point — its internal geometry and attributes are carried by
that scale instead of being scaled individually, fixing the block-attribute size
regression. Tables scale their column/row/margin geometry.

Properties: the handle- and flag-backed rows are now editable pickers — MLEADER
multileader style / text style / arrowhead / leader linetype, General Material, and
Plot style (named plot-style mode only; the color-dependent mode stays read-only,
which is correct). A picked name is resolved back to its handle in the update loop,
where the document is in scope. Annotative Yes/No and the annotation-scale row are
shown per object.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/entities/insert.rs

@@ -37,7 +37,7 @@ fn properties(ins: &Insert) -> Vec<PropSection> {
             },
         })
         .collect();
-    vec![
+    let mut sections = vec![
         PropSection {
             title: "Geometry".into(),
             props: vec![
@@ -54,24 +54,24 @@ fn properties(ins: &Insert) -> Vec<PropSection> {
             props: vec![
                 ro("Name", "block", ins.block_name.clone()),
                 edit("Rotation", "rotation", ins.rotation.to_degrees()),
-                ro("Block Unit", "block_unit", String::new()),
-                ro("Unit factor", "unit_factor", String::new()),
                 ro(
                     "Annotative",
                     "annotative",
                     if annotative { "Yes" } else { "No" },
                 ),
+                ro("Block Unit", "block_unit", String::new()),
+                ro("Unit factor", "unit_factor", String::new()),
             ],
         },
-        PropSection {
+    ];
+    // The Attributes group appears only when the block actually has attributes.
+    if !attrs.is_empty() {
+        sections.push(PropSection {
             title: "Attributes".into(),
             props: attrs,
-        },
-        PropSection {
-            title: "Custom".into(),
-            props: Vec::new(),
-        },
-    ]
+        });
+    }
+    sections
 }
 
 fn apply_geom_prop(ins: &mut Insert, field: &str, value: &str) {
@@ -206,12 +206,39 @@ pub(crate) fn append_insert_attribute_wires(
     if attmode == 0 {
         return;
     }
+    // An annotative block scales as ONE uniform unit about its insertion point;
+    // its attributes are carried by that scale (AutoCAD even forbids annotative
+    // attributes inside annotative blocks, to avoid double-scaling). So pre-scale
+    // the annotative attribute about the insertion point and tessellate it at a
+    // neutral 1.0 — the text path must never scale it a second time.
+    let annotative = ins
+        .common
+        .extended_data
+        .get_record("AcAnnotativeData")
+        .is_some();
+    let block_scale = if annotative { anno_scale as f64 } else { 1.0 };
+    let ip = ins.insert_point;
+    let scale_about = |q: acadrust::types::Vector3| {
+        acadrust::types::Vector3::new(
+            ip.x + (q.x - ip.x) * block_scale,
+            ip.y + (q.y - ip.y) * block_scale,
+            ip.z + (q.z - ip.z) * block_scale,
+        )
+    };
     for attr in &ins.attributes {
         let per_attr_hidden = attr.common.invisible || attr.flags.invisible;
         if attmode == 1 && per_attr_hidden {
             continue;
         }
-        let attr_entity = EntityType::AttributeEntity(attr.clone());
+        let attr_entity = EntityType::AttributeEntity({
+            let mut a = attr.clone();
+            if (block_scale - 1.0).abs() > 1e-6 {
+                a.height *= block_scale;
+                a.insertion_point = scale_about(a.insertion_point);
+                a.alignment_point = scale_about(a.alignment_point);
+            }
+            a
+        });
         let (sub_color, sub_plen, sub_pat, sub_lw_px, sub_aci) = render::render_style_for_block_sub(
             document,
             &attr_entity,
@@ -237,7 +264,9 @@ pub(crate) fn append_insert_attribute_wires(
             sub_plen * pslt_factor,
             sub_pat.map(|v| v * pslt_factor),
             sub_lw_px,
-            anno_scale,
+            // Neutral: the attribute is already scaled as part of the block unit
+            // above, so the text path must not scale it a second time.
+            1.0,
             None,
             bg_color,
             false,