nostrverse: fix rotation editor euler decomposition and tilemap z-fighting

to_euler(YXZ) returns (Y, X, Z) but the rotation editor and drag-snap
code destructured as (_, y, _), reading the X angle instead of Y.
Also bump the tilemap Y offset from 0.001 to 0.01 so depth buffer
can distinguish it from the grid plane.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jb55

crates/notedeck_nostrverse/src/room_view.rs

@@ -320,7 +320,7 @@ pub fn show_room_view(
                     let angle = delta_x * ROTATE_SENSITIVITY;
                     let new_rotation = Quat::from_rotation_y(angle) * obj.rotation;
                     let new_rotation = if state.grid_snap_enabled {
-                        let (_, y, _) = new_rotation.to_euler(glam::EulerRot::YXZ);
+                        let (y, _, _) = new_rotation.to_euler(glam::EulerRot::YXZ);
                         let snap_rad = state.rotation_snap.to_radians();
                         let snapped_y = (y / snap_rad).round() * snap_rad;
                         Quat::from_rotation_y(snapped_y)
@@ -563,7 +563,7 @@ fn render_object_inspector(
     obj.scale = Vec3::new(sx, sy, sz);
 
     // Editable Y rotation (degrees)
-    let (_, angle_y, _) = obj.rotation.to_euler(glam::EulerRot::YXZ);
+    let (angle_y, _, _) = obj.rotation.to_euler(glam::EulerRot::YXZ);
     let mut deg = angle_y.to_degrees();
     let rot_changed = ui
         .horizontal(|ui| {

crates/notedeck_nostrverse/src/tilemap.rs

@@ -237,7 +237,7 @@ pub fn build_tilemap_model(
     // Center the tilemap so origin is in the middle
     let offset_x = -(w as f32) / 2.0;
     let offset_z = -(h as f32) / 2.0;
-    let y = 0.001_f32; // Just above ground to avoid z-fighting with grid
+    let y = 0.01_f32; // Above ground plane to avoid z-fighting with grid
 
     let normal = [0.0_f32, 1.0, 0.0]; // Facing up
     let tangent = [1.0_f32, 0.0, 0.0, 1.0]; // Tangent along +X