feat(assets): Add Texture Asset support (Task #18.0 prep)

- Integrated stb_image for image decompression in asset_packer.
- Added GetTextureAsset helper in asset_manager.
- Updated procedural asset generation to include dimensions header for consistency.
- Updated test_assets to verify new asset format.

1 files changed, 9 insertions, 6 deletions

diff --git a/src/tests/test_assets.cc b/src/tests/test_assets.cc
index 128bb1c..a1ae795 100644
--- a/src/tests/test_assets.cc
+++ b/src/tests/test_assets.cc
@@ -54,13 +54,15 @@ int main() {
   const uint8_t* proc_data_1 =
       GetAsset(AssetId::ASSET_PROC_NOISE_256, &proc_size);
   assert(proc_data_1 != nullptr);
-  assert(proc_size == 256 * 256 * 4); // 256x256 RGBA8
+  // Expect 256x256 RGBA8 + 8 byte header
+  assert(proc_size == 256 * 256 * 4 + 8); 
 
-  // Verify first few bytes are not all zero (noise should produce non-zero
-  // data)
+  // Verify first few bytes of DATA (skip header)
+  // Header is 8 bytes
+  const uint8_t* pixel_data_1 = proc_data_1 + 8;
   bool non_zero_data = false;
-  for (size_t i = 0; i < 16; ++i) { // Check first 16 bytes
-    if (proc_data_1[i] != 0) {
+  for (size_t i = 0; i < 16; ++i) { // Check first 16 bytes of pixels
+    if (pixel_data_1[i] != 0) {
       non_zero_data = true;
       break;
     }
@@ -79,8 +81,9 @@ int main() {
 
   // Verify content again to ensure it was re-generated correctly
   non_zero_data = false;
+  const uint8_t* pixel_data_2 = proc_data_2 + 8;
   for (size_t i = 0; i < 16; ++i) {
-    if (proc_data_2[i] != 0) {
+    if (pixel_data_2[i] != 0) {
       non_zero_data = true;
       break;
     }