diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
index a515954cb..ab733b185 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
@@ -2667,6 +2667,15 @@ fn direct_registered_taonier_runtime_image_paths(root: &Path) -> Vec<String> {
                     .generation_route
                     .as_deref()
                     .is_some_and(|route| route.starts_with("/api/external/v1/editor/"))
+                // Canonical slices are admitted only through
+                // `direct_registered_taonier_slice_paths` after the full slice
+                // manifest/receipt/content validation. This generic fallback
+                // must not re-admit a slice whose bytes no longer match the
+                // registered receipt.
+                && !(asset.kind == "art-spritesheet-slice"
+                    && asset
+                        .local_path
+                        .starts_with("assets/art-spritesheet-slices/"))
         })
         .filter_map(|asset| {
             let path = direct_normalized_project_asset_path(&asset.local_path)?;
@@ -5712,6 +5721,8 @@ mod tests {
             activity: None,
             accumulated_text: Some("partial".to_string()),
             tool_calls: None,
+            reasoning_text: None,
+            stream_items: None,
             updated_at: 42,
         })
         .expect("serialize direct update");
@@ -8767,11 +8778,6 @@ mod tests {
             "const player = new Image(); player.src = '/assets/art-spritesheet-slices/player.png';",
         )
         .expect("scene");
-        std::fs::write(
-            root.join("assets/art-spritesheet-slices/player.png"),
-            tiny_opaque_png(),
-        )
-        .expect("slice");
 
         assert_eq!(
             direct_game_sources_referenced_taonier_assets(&root),
diff --git a/apps/ai-game-creator-shell/src-tauri/src/project/conversation/tests.rs b/apps/ai-game-creator-shell/src-tauri/src/project/conversation/tests.rs
index 9bad4a007..993c1c378 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/project/conversation/tests.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/project/conversation/tests.rs
@@ -272,7 +272,7 @@ fn project_history_skips_direct_project_rows_but_keeps_other_broken_rows_failing
 }
 
 #[test]
-fn mixed_project_history_rows_stay_readable_from_both_sides() {
+fn mixed_project_history_rows_read_by_generic_chain_but_fail_closed_for_direct_project() {
     let root = unique_conversation_test_root();
     init_local_game_project_at(&root, "project-1", "写侧统一测试").expect("init project");
     write_project_history(&root, &[DIRECT_PROJECT_ROW]);
@@ -309,19 +309,12 @@ fn mixed_project_history_rows_stay_readable_from_both_sides() {
         vec!["模式切换后由通用写入器补写的回复", "带 id 的旧格式回复"]
     );
 
-    // 反向：DirectProject 链把同一份文件里的两种行都读出来，混合文件不构成毒化。
-    let direct_items = crate::agent::read_direct_project_history_items_at(&root)
-        .expect("DirectProject must keep reading the mixed history");
-    assert_eq!(
-        direct_items
-            .iter()
-            .map(|item| item["content"][0]["text"].as_str().unwrap_or_default())
-            .collect::<Vec<_>>(),
-        vec![
-            "再加一个按钮",
-            "模式切换后由通用写入器补写的回复",
-            "带 id 的旧格式回复",
-        ]
+    // 反向：DirectProject 链只接受 response_item 信封，混合文件里的 legacy 行让它失败关闭。
+    let error = crate::agent::read_direct_project_history_items_at(&root)
+        .expect_err("DirectProject must fail closed on legacy rows");
+    assert!(
+        error.starts_with("DirectProject 历史记录类型无效"),
+        "{error}"
     );
 
     std::fs::remove_dir_all(root).ok();
diff --git a/apps/ai-game-creator-shell/src/App.tsx b/apps/ai-game-creator-shell/src/App.tsx
index 2438d17f8..ee075cfa5 100644
--- a/apps/ai-game-creator-shell/src/App.tsx
+++ b/apps/ai-game-creator-shell/src/App.tsx
@@ -244,6 +244,7 @@ import {
   type DirectThreadSubscriptionBootstrap,
   isDirectTurnInProgress,
 } from './features/project-workspace/directThreadEvents';
+import { normalizeDirectTimestamp } from './features/project-workspace/directTurnPresentation';
 import type { DirectCodexUserContentPart } from './features/project-workspace/generated';
 import {
   appendMemoryContent,
@@ -1010,6 +1011,8 @@ export function App({
       const normalized: GameCreatorDirectToolCall = {
         ...call,
         id,
+        startedAt: normalizeDirectTimestamp(call.startedAt),
+        updatedAt: normalizeDirectTimestamp(call.updatedAt),
         detail: call.detail ?? { changes: [] },
       };
       // 起点时间取更早的那个：`completed` 事件不一定带 startedAt。
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts b/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts
index 217646a9f..2449331d5 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/directTurnPresentation.ts
@@ -26,7 +26,8 @@ export type DirectTurnPresentation = {
   endedAt: number;
 };
 
-export function directMessageTimestamp(value: number | undefined) {
+/** 统一 Direct 时间戳为 Unix 毫秒；历史/异常 payload 可能传 Unix 秒。 */
+export function normalizeDirectTimestamp(value: number | undefined) {
   const timestamp =
     value && Number.isFinite(value) && value > 0
       ? value < 100_000_000_000
@@ -36,6 +37,8 @@ export function directMessageTimestamp(value: number | undefined) {
   return Number.isFinite(new Date(timestamp).getTime()) ? timestamp : 0;
 }
 
+export const directMessageTimestamp = normalizeDirectTimestamp;
+
 /** 从唯一呈现来源分区，完成后只把最终回复及失败提示留在过程折叠区之外。 */
 export function splitDirectTurnContent(turn: DirectTurnPresentation) {
   const assistants = turn.messages.filter(
diff --git a/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts b/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts
index c336f025b..c97057461 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts
@@ -218,11 +218,11 @@ const markdownExtension = /\.(md|markdown|mdx)$/iu;
  *
  * 与 `resourceProjectionModel` 的 `gameCodeExtension` 是两份口径，刻意不复用：
  * 那份用于**筛选与归属**，改动会波及画布栏目与计数；这份只决定**卡面怎么画**。
- * 这里按用户口径把 `.json` / `.yaml` / `.toml` / `.xml` / `.html` / `.css` / `.sql`
- * 一并算代码 —— 它们在上游被登记成「文档」，但卡面当代码画更干净。
+ * 这里按用户口径把 `.yaml` / `.toml` / `.xml` / `.html` / `.css` / `.sql`
+ * 一并算代码；JSON 规格属于文档预览。
  */
 const cardCodeExtension =
-  /\.(ts|tsx|mts|cts|js|jsx|mjs|cjs|rs|py|go|java|kt|kts|cs|cpp|cc|cxx|c|h|hpp|swift|php|rb|lua|sh|bash|zsh|ps1|psm1|json|jsonc|ya?ml|toml|xml|html?|css|scss|less|sql|graphql|gql|vue|svelte)$/iu;
+  /\.(ts|tsx|mts|cts|js|jsx|mjs|cjs|rs|py|go|java|kt|kts|cs|cpp|cc|cxx|c|h|hpp|swift|php|rb|lua|sh|bash|zsh|ps1|psm1|ya?ml|toml|xml|html?|css|scss|less|sql|graphql|gql|vue|svelte)$/iu;
 /** 纯文本：按纯文本处理，显示前几行但不做标记清理。 */
 const plainTextExtension =
   /\.(txt|text|csv|tsv|log|ini|conf|cfg|properties|env)$/iu;
@@ -256,7 +256,7 @@ export function projectResourceCardPreviewKind(
     return 'document';
   }
   // Markdown / 代码在扩展名这一层就分流，不再依赖上游登记类型：
-  // 上游把 `.json` / `.tsx` 这类文件登记成「文档」，卡面却该按代码画。
+  // 上游把 JSON 规格登记成「文档」，卡面按文档预览；代码文件按扩展名分流。
   if (markdownExtension.test(resource.path)) {
     return 'document';
   }
diff --git a/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts b/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts
index 74d8c8426..f47f263a2 100644
--- a/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts
+++ b/apps/ai-game-creator-shell/tests/directTurnPresentation.test.ts
@@ -8,6 +8,7 @@ import type {
 import {
   buildDirectTurnPresentations,
   directMessageTimestamp,
+  normalizeDirectTimestamp,
   splitDirectTurnContent,
 } from '../src/features/project-workspace/directTurnPresentation';
 
@@ -58,6 +59,12 @@ const build = (
   });
 
 describe('DirectProject 回合唯一呈现', () => {
+  it('把 Unix 秒时间戳归一化为毫秒，已有毫秒值保持不变', () => {
+    expect(normalizeDirectTimestamp(1_800_000_000)).toBe(1_800_000_000_000);
+    expect(normalizeDirectTimestamp(1_800_000_000_000)).toBe(1_800_000_000_000);
+    expect(directMessageTimestamp(1_800_000_000)).toBe(1_800_000_000_000);
+  });
+
   it('历史仍有未加载切片时，不把那些回合的工具流追加到当前页末尾', () => {
     const rows = build(
       [user('one')],
diff --git a/apps/ai-game-creator-shell/tests/selectedLayerToolbarDividerDedupe.test.ts b/apps/ai-game-creator-shell/tests/selectedLayerToolbarDividerDedupe.test.ts
index feca4d761..6a6d33315 100644
--- a/apps/ai-game-creator-shell/tests/selectedLayerToolbarDividerDedupe.test.ts
+++ b/apps/ai-game-creator-shell/tests/selectedLayerToolbarDividerDedupe.test.ts
@@ -3,21 +3,17 @@ import { readFileSync } from 'node:fs';
 import { describe, expect, it } from 'vitest';
 
 /**
- * 选中资源工具条上的「两条分隔线」回归钉子。
+ * 选中资源工具条上的分隔线分组回归钉子。
  *
  * 成因：共享工具条 `ImageCanvasSelectedLayerToolbarView.tsx` 会在 `showQuickEdit` 时于
  * 「快速编辑」之后输出一条分隔线，同时为 `extraActions` 自动生成一条前置分隔线
  * （`const extraActionDivider = extraActions ? … : null`）。AGC 资源卡是"快速编辑可用 +
  * 中间那些动作未接通不渲染"的组合，两条于是直接相邻，用户看到两条竖线。
  *
- * 修法是样式层去重（相邻的两条只显示一条）。这条用例钉住"规则确实存在"，避免以后被
- * 顺手删掉又回到两条线；同时钉住成因——若哪天共享工具条不再自动生成前置分隔线，
- * 这条断言会失败并提醒重新评估去重规则是否还需要。
+ * 当前实现直接按动作组是否存在输出分隔线，避免相邻分隔线产生。这条用例钉住当前
+ * 条件分组，避免后续重构时再次出现空动作组之间的重复分隔线。
  */
 describe('选中资源工具条的分隔线去重', () => {
-  const repoRootCss = () =>
-    readFileSync(new URL('../../../src/index.css', import.meta.url), 'utf8');
-
   const sharedToolbarSource = () =>
     readFileSync(
       new URL(
@@ -27,30 +23,15 @@ describe('选中资源工具条的分隔线去重', () => {
       'utf8',
     );
 
-  it('相邻的两条分隔线只显示一条', () => {
-    const css = repoRootCss().replace(/\s+/g, ' ');
-    expect(css).toContain(
-      '.image-canvas-editor__floating-toolbar-divider + .image-canvas-editor__floating-toolbar-divider { display: none; }',
-    );
-  });
-
-  it('共享工具条确实会为 extraActions 自动生成前置分隔线（去重规则的成因）', () => {
-    expect(sharedToolbarSource()).toContain(
-      'const extraActionDivider = extraActions ?',
-    );
-  });
-
-  it('「快速编辑」之后那条分隔线仍由共享工具条自己输出（去重的另一端）', () => {
+  it('分隔线由动作组条件控制，不依赖相邻分隔线的 CSS 去重', () => {
     const source = sharedToolbarSource();
     expect(source).toContain('const showQuickEdit = isActionSupported(');
-    // 快速编辑按钮与它后面那条分隔线必须同时存在于 showQuickEdit 分支里。
-    const quickEditBlock = source.slice(
-      source.indexOf('{showQuickEdit ? ('),
-      source.indexOf('{canRasterEdit && isActionSupported('),
+    expect(source).toContain('const hasEditingActions =');
+    expect(source).toContain(
+      '{showQuickEdit && hasEditingActions ? divider : null}',
     );
-    expect(quickEditBlock).toContain('label="快速编辑"');
-    expect(quickEditBlock).toContain(
-      'image-canvas-editor__floating-toolbar-divider',
+    expect(source).toContain(
+      '{(showQuickEdit || hasEditingActions || canRedraw || hasExtraActions) &&',
     );
   });
 });