迁移资源桥接测试 fixture 到枚举

将图集切片、角色动画和规格资源 fixture 改用对应 AssetKind 变体。

apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs

@@ -3188,7 +3188,7 @@ mod tests {
     fn bridge_art_resource_exposes_only_the_safe_identity_projection() {
         let asset = GameCreationAppAssetManifestEntry {
             id: "local-art-1".to_string(),
-            kind: "art-spritesheet-slice".to_string(),
+            kind: GameCreationAppAssetKind::Icon,
             media_type: "image/png".to_string(),
             local_path: "assets/art-spritesheet-slices/player.png".to_string(),
             image_sequence_frames: None,
@@ -3245,7 +3245,7 @@ mod tests {
     fn bridge_registered_resource_exposes_formal_sequence_without_private_generation_fields() {
         let asset = GameCreationAppAssetManifestEntry {
             id: "animation-1".to_string(),
-            kind: "character-animation".to_string(),
+            kind: GameCreationAppAssetKind::CharacterAnimation,
             media_type: "video/mp4".to_string(),
             local_path: "assets/edits/animation.mp4".to_string(),
             image_sequence_frames: Some(vec![
@@ -3296,7 +3296,7 @@ mod tests {
     fn bridge_registered_resource_keeps_explicit_manifest_classification() {
         let asset = GameCreationAppAssetManifestEntry {
             id: "spec-1".to_string(),
-            kind: "spec".to_string(),
+            kind: GameCreationAppAssetKind::Spec,
             media_type: "application/json".to_string(),
             local_path: "assets/specs/hero.json".to_string(),
             image_sequence_frames: None,