activa -Wextra -Wpedantic i neteja warnings

CMakeLists.txt

@@ -216,6 +216,12 @@ target_include_directories(${PROJECT_NAME} PUBLIC
     "${CMAKE_BINARY_DIR}"
 )
 
+# Capçaleres de tercers a source/external/ — tractades com a sistema per
+# silenciar warnings (gif.h, etc.) que no controlem.
+target_include_directories(${PROJECT_NAME} SYSTEM PUBLIC
+    "${CMAKE_SOURCE_DIR}/source/external"
+)
+
 # Enlazar SDL3
 if(APPLE AND MACOS_BUNDLE)
     target_compile_definitions(${PROJECT_NAME} PRIVATE MACOS_BUNDLE)
@@ -232,7 +238,7 @@ else()
 endif()
 
 # --- FLAGS DE COMPILACIÓN ---
-target_compile_options(${PROJECT_NAME} PRIVATE -Wall)
+target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra -Wpedantic)
 target_compile_options(${PROJECT_NAME} PRIVATE $<$<CONFIG:RELEASE>:-Os -ffunction-sections -fdata-sections>)
 
 # --- CONFIGURACIÓN POR PLATAFORMA ---
@@ -269,7 +275,7 @@ if(NOT EMSCRIPTEN)
         source/core/resources/resource_pack.cpp
     )
     target_include_directories(pack_resources PRIVATE "${CMAKE_SOURCE_DIR}/source")
-    target_compile_options(pack_resources PRIVATE -Wall)
+    target_compile_options(pack_resources PRIVATE -Wall -Wextra -Wpedantic)
 
     # --- Regeneració automàtica de resources.pack ---
     # Cada `cmake --build build` torna a empaquetar `data/` si algun fitxer ha