fix(shaders): deduplicate VertexOutput/vs_main via render/fullscreen_uv_vs snippet

- Fix vs_main return type (VertexOutput, not vec4<f32>)
- Fix #include paths in passthrough, gaussian_blur, heptagon, combined_postprocess
- ShaderComposer: assert + suggest correct path on missing #include (non-STRIP_ALL)
- VerifyIncludes: upgrade WARNING to ERROR + assert, add "did you mean?" hint

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

1 files changed, 1 insertions, 19 deletions

diff --git a/common/shaders/skybox.wgsl b/common/shaders/skybox.wgsl
index 31bea3b..d280390 100644
--- a/common/shaders/skybox.wgsl
+++ b/common/shaders/skybox.wgsl
@@ -1,29 +1,11 @@
 #include "common_uniforms"
 #include "math/common_utils"
+#include "render/fullscreen_uv_vs"  // <- VertexOutput + vs_main
 
 @group(0) @binding(0) var sky_tex: texture_2d<f32>;
 @group(0) @binding(1) var sky_sampler: sampler;
 @group(0) @binding(2) var<uniform> globals: GlobalUniforms;
 
-struct VertexOutput {
-    @builtin(position) position: vec4<f32>,
-    @location(0) uv: vec2<f32>,
-};
-
-@vertex
-fn vs_main(@builtin(vertex_index) vertex_index: u32) -> VertexOutput {
-    var pos = array<vec2<f32>, 3>(
-        vec2<f32>(-1.0, -1.0),
-        vec2<f32>( 3.0, -1.0),
-        vec2<f32>(-1.0,  3.0)
-    );
-    
-    var out: VertexOutput;
-    out.position = vec4<f32>(pos[vertex_index], 0.0, 1.0);
-    out.uv = vec2<f32>(pos[vertex_index].x * 0.5 + 0.5, 1.0 - (pos[vertex_index].y * 0.5 + 0.5));
-    return out;
-}
-
 @fragment
 fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
     // Convert UV to NDC