Use uintptr_t reinterpret_cast for Metal textures

Include imiv_viewer.h and update texture pointer-to-ID conversions to use reinterpret_cast<uintptr_t> instead of static_cast<intptr_t>. This replaces signed intptr_t casts with an unsigned uintptr_t and a reinterpret_cast for both main and closeup Metal texture refs to ensure correct pointer-to-integer conversion and improve portability.

Author: ssh4net

src/imiv/imiv_renderer_metal.mm

@@ -5,6 +5,7 @@
 #include "imiv_renderer_backend.h"
 
 #include "imiv_platform_glfw.h"
+#include "imiv_viewer.h"
 
 #include <imgui_impl_metal.h>
 
@@ -427,7 +428,7 @@
         main_texture = state->preview_linear_texture;
     if (main_texture != nil) {
         main_texture_ref = ImTextureRef(static_cast<ImTextureID>(
-            static_cast<intptr_t>((__bridge void*)main_texture)));
+            reinterpret_cast<uintptr_t>((__bridge void*)main_texture)));
         has_main_texture = true;
     }
 
@@ -436,7 +437,7 @@
         closeup_texture = state->preview_linear_texture;
     if (closeup_texture != nil) {
         closeup_texture_ref = ImTextureRef(static_cast<ImTextureID>(
-            static_cast<intptr_t>((__bridge void*)closeup_texture)));
+            reinterpret_cast<uintptr_t>((__bridge void*)closeup_texture)));
         has_closeup_texture = true;
     }
     return has_main_texture || has_closeup_texture;