feat(block-editor): wire Rotation, Alignment and Flip parameter placement

Enable the existing palette rows and BPARAMETER choices. Rotation accepts a
center, picked or numeric radius, and picked or numeric default angle.
Alignment places a tangent direction from its base point. Flip places a
reflection line and state label, with native grip and state expressions.

Extend shared graph append/capacity checks for Flip's additional state node
while preserving existing subgraphs. Keep Polar/Rotation angle labels unique
in either placement order. Add editor graphics, extents and definition
reframing through the existing overlay/history/save paths.

This milestone implements native parameter placement and persistence.
Rotate/Flip action association, reference alignment/grip editing, parameter
property editing and parameter sets remain separate work.

Validation covers command and palette placement, cancellation, local/parent
undo, save/discard, native DWG/DXF objects, existing graph preservation and
the 17 research fixtures. Broader block/dock regressions and editor renders
are also checked.

src/command.rs

@@ -1514,6 +1514,15 @@ impl DimensionPreview {
 /// Returned by every `CadCommand` method to tell main.rs what to do.
 #[allow(dead_code)]
 pub enum CmdResult {
+    /// Place a native Rotation, Alignment or Flip parameter.
+    PlaceBlockOrientationParameter {
+        document_id: u64,
+        definition: Handle,
+        kind: crate::scene::block_orientation_parameter::Kind,
+        base: DVec3,
+        end: DVec3,
+        reference: DVec3,
+    },
     /// Place a native two-point parameter after its base, end and label picks.
     PlaceBlockDistanceParameter {
         document_id: u64,