feat(render): wireframe modes hide mesh & 3D fills

Wireframe 2D/3D modlarında Solid3D meshlerini edge-only çizmek için
LineList topolojili bir mesh wireframe pipeline ve her üçgenin
(a,b),(b,c),(c,a) kenarlarına genişletilmiş ayrı bir index buffer
eklendi. PolyfaceMesh / PolygonMesh face fill'leri (fill_tris + dolu
points) wireframe'de gizleniyor; text greek / MultiLeader gibi 2D
fill'ler (points boş) etkilenmiyor.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/scene/pipeline/face3d_gpu.rs

@@ -62,6 +62,7 @@ impl Face3DGpu {
         device: &wgpu::Device,
         face3d_wires: &[WireModel],
         all_wires: &[WireModel],
+        keep_3d_mesh_fills: bool,
     ) -> Self {
         let mut vertices: Vec<Face3DVertex> = Vec::with_capacity(face3d_wires.len() * 6);
 
@@ -91,10 +92,20 @@ impl Face3DGpu {
         // AO-style dim to them would wash out user-picked colors. Wires
         // with both fill_tris and points (mesh edges + faces) keep the dim
         // so PolyfaceMesh / PolygonMesh still look 3-D-shaded.
+        //
+        // When `keep_3d_mesh_fills` is false (wireframe render modes),
+        // skip wires that carry 3-D mesh face data (`points` + `fill_tris`)
+        // while leaving 2-D fills (text greek, MultiLeader background)
+        // alone — they're not "3D objects" the wireframe toggle should
+        // hide.
         for wire in all_wires {
             if wire.fill_tris.is_empty() {
                 continue;
             }
+            let is_3d_mesh_face = !wire.points.is_empty();
+            if is_3d_mesh_face && !keep_3d_mesh_fills {
+                continue;
+            }
             let [r, g, b, a] = wire.color;
             let fill_color = if wire.points.is_empty() {
                 [r, g, b, a]