重构: 前端DRY收口+后端测试类型对齐

- 新增 useToast composable: 消除 AiChat/Settings/Projects 4处 toast 重复
  统一默认3000ms(Projects原4000ms为操作类提示保留参数覆盖)
- 新增 utils/json.ts parseJsonArray: 消除 parseStack/parseTags/ModuleNode
  3处JSON字符串数组解析重复
- 新增 utils/html.ts escapeHtml: 消除 useMarkdown/FilePreview 2处重复
- ProjectDetail score-bar 内联三元改用 scoreTier(消除最后一处阈值硬编码)
- ConversationSidebar 删除 formatTime 透传包装(直接用 formatRelative)
- 清理死代码: parseTs/stringifyError/ErrorSink/_Unused 改私有或删除
  wrapNakedDiff 改私有(无外部 import)
- ModuleNode shortPath 改名 truncatedPath(与 useToolCard.shortPath 语义不同)

src-tauri/src/commands/ai/augmentation/inject.rs

@@ -189,6 +189,7 @@ mod tests {
             status: ProjectStatus::InProgress,
             description: "AI-native dev tool".into(),
             path: Some(SanitizedPath::new("E:/wk-lab/devflow")),
+            extra: vec![],
         };
         let seg = build_augmentation_segment(&[aug], "zh");
         assert!(seg.starts_with("--- 以下是用户选择的上下文参考"), "头部应隔离标注, got: {}", seg);
@@ -206,6 +207,7 @@ mod tests {
             status: TaskStatus::Todo,
             description: "do X".into(),
             project_name: Some("devflow".into()),
+            extra: vec![],
         };
         let seg = build_augmentation_segment(&[aug], "zh");
         assert!(seg.contains("【任务】Implement X"));
@@ -234,6 +236,7 @@ mod tests {
                 title: "Idea1".into(),
                 status: IdeaStatus::Approved,
                 description: String::new(),
+                extra: vec![],
             },
             Augmentation::Project {
                 id: "p1".into(),
@@ -241,6 +244,7 @@ mod tests {
                 status: ProjectStatus::Planning,
                 description: String::new(),
                 path: None,
+                extra: vec![],
             },
         ];
         let seg = build_augmentation_segment(&augs, "zh");
@@ -258,6 +262,7 @@ mod tests {
             title: "Idea1".into(),
             status: IdeaStatus::Approved,
             description: String::new(),
+            extra: vec![],
         };
         let seg = build_augmentation_segment(&[aug], "en");
         assert!(seg.starts_with("--- The following is the context"), "en 头部: {}", seg);
@@ -271,6 +276,7 @@ mod tests {
             title: "Idea1".into(),
             status: IdeaStatus::Approved,
             description: String::new(),
+            extra: vec![],
         };
         let seg = build_augmentation_segment(&[aug], "fr");
         assert!(seg.starts_with("--- 以下是用户选择的上下文参考"), "未知 lang 应按 zh 兜底");
@@ -284,6 +290,7 @@ mod tests {
             status: ProjectStatus::Planning,
             description: String::new(),
             path: None,
+            extra: vec![],
         };
         let seg = build_augmentation_segment(&[aug], "zh");
         assert!(!seg.contains("目录:"), "无 path 不应渲染目录行: {}", seg);