chore(glam): use camera-module projection API for deprecated Mat4 rh ctors

glam 0.33.2 deprecated Mat4::{orthographic,perspective,look_at}_rh in
favour of the glam::camera::rh::* functions. Switch the 7 call sites in
camera.rs and viewcube.rs to the equivalent camera-module functions
(directx orthographic/perspective = same [0,1] depth range; look_at_mat4
= same view matrix), silencing the deprecation warnings. No behaviour
change.

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

src/scene/pipeline/viewcube.rs

@@ -10,6 +10,7 @@
 // with arcball orbit at all angles.
 
 use bytemuck::{Pod, Zeroable};
+use glam::camera::rh::proj::directx::orthographic;
 use glam::{Mat4, Vec3, Vec4};
 use iced::wgpu;
 use iced::{Rectangle, Size};
@@ -208,7 +209,7 @@ impl CubeUniforms {
         let inset = cube_half * NAV_INSET_F;
         let cx = hw - inset - VIEWCUBE_PAD;
         let cy = hh - inset - VIEWCUBE_PAD;
-        let view_proj = Mat4::orthographic_rh(-hw, hw, -hh, hh, -2000.0, 2000.0)
+        let view_proj = orthographic(-hw, hw, -hh, hh, -2000.0, 2000.0)
             * Mat4::from_translation(Vec3::new(cx, cy, 0.0))
             * Mat4::from_scale(Vec3::splat(cube_px as f32 * VIEWCUBE_SCALE));
         Self {
@@ -580,7 +581,7 @@ impl ViewCubeText {
         let cube_half = cube_px as f32 * VIEWCUBE_SCALE;
         let inset = cube_half * NAV_INSET_F;
         let (hw, hh) = (vw * 0.5, vh * 0.5);
-        let view_proj = Mat4::orthographic_rh(-hw, hw, -hh, hh, -2000.0, 2000.0)
+        let view_proj = orthographic(-hw, hw, -hh, hh, -2000.0, 2000.0)
             * Mat4::from_translation(Vec3::new(
                 hw - inset - VIEWCUBE_PAD,
                 hh - inset - VIEWCUBE_PAD,
@@ -1349,7 +1350,7 @@ pub fn hit_test(
     }
 
     let (hw, hh) = (vp_w * 0.5, vp_h * 0.5);
-    let vp = Mat4::orthographic_rh(-hw, hw, -hh, hh, -2000.0, 2000.0)
+    let vp = orthographic(-hw, hw, -hh, hh, -2000.0, 2000.0)
         * Mat4::from_translation(Vec3::new(
             hw - inset - VIEWCUBE_PAD,
             hh - inset - VIEWCUBE_PAD,
@@ -1431,7 +1432,7 @@ pub fn hit_test_cardinal(
     }
 
     let (hw, hh) = (vp_w * 0.5, vp_h * 0.5);
-    let vp = Mat4::orthographic_rh(-hw, hw, -hh, hh, -2000.0, 2000.0)
+    let vp = orthographic(-hw, hw, -hh, hh, -2000.0, 2000.0)
         * Mat4::from_translation(Vec3::new(
             hw - inset - VIEWCUBE_PAD,
             hh - inset - VIEWCUBE_PAD,

src/scene/view/camera.rs

@@ -11,6 +11,8 @@
 //
 // Coordinate convention: Z-up world space (same as the rest of OpenCADStudio).
 
+use glam::camera::rh::proj::directx::{orthographic, perspective};
+use glam::camera::rh::view::look_at_mat4;
 use glam::{DVec3, Mat4, Quat, Vec3};
 use iced::{Point, Rectangle};
 
@@ -126,19 +128,19 @@ impl Camera {
         let aspect = bounds.width / bounds.height;
         let up_dir = self.rotation * Vec3::Y;
 
-        let mut view = Mat4::look_at_rh(self.eye().as_vec3(), self.target.as_vec3(), up_dir);
+        let mut view = look_at_mat4(self.eye().as_vec3(), self.target.as_vec3(), up_dir);
         // Zero the translation column → pure rotation (world→view basis).
         view.w_axis = glam::vec4(0.0, 0.0, 0.0, 1.0);
 
         let proj = match self.projection {
             Projection::Perspective => {
-                Mat4::perspective_rh(self.fov_y, aspect, self.distance * 0.001, self.distance * 1000.0)
+                perspective(self.fov_y, aspect, self.distance * 0.001, self.distance * 1000.0)
             }
             Projection::Orthographic => {
                 let h = self.ortho_size();
                 let w = h * aspect;
                 let (near, far) = self.ortho_depth_range();
-                Mat4::orthographic_rh(-w, w, -h, h, near, far)
+                orthographic(-w, w, -h, h, near, far)
             }
         };
         OPENGL_TO_WGPU * proj * view