重构: 前端DRY(style全局沉淀 + ts/js公共沉淀)

style-dry:
- 新增 src/styles/components.css: .info-item*/.panel/.panel-header/.tech-tag/.card-tags 全局
- main.ts 注册 import
- 删重复: ProjectDetail/TaskDetail/TaskOutputCard/ProjectCard/Projects(scoped删重复, 全局对子组件生效)
- 未使用清理: Projects .card-progress dead(1处保守核对)

tsjs-dry:
- aiShared.ts: resolveAiLang(合并useAiSend.resolveLang + useAiContext.resolveLanguage)
- stores/knowledge.ts: kindText/kindLabel/kindIcon/knowledgeStatusLabel/knowledgeConfidenceLabel(5公共)
- 删重复: useAiSend/useAiContext(resolveLang) + Knowledge/KnowledgeDetail(4+5 helper) + ActiveProjectsPanel(formatLastActivity→formatRelativeZh复用)

strategy: DRY收口, 公共沉淀(utils/store/shared); relativeTime非纯重复保留; .btn/.empty-hint局部override WATCH未动

src/composables/ai/useAiSend.ts

@@ -19,31 +19,15 @@ import { listen } from '@tauri-apps/api/event'
 import { invoke } from '@tauri-apps/api/core'
 import { ref } from 'vue'
 import { aiApi } from '@/api'
-import { useAppSettingsStore } from '@/stores/appSettings'
 import { state } from '@/stores/ai'
 import type { ContentPart, AiMessage } from '@/api/types'
 import i18n from '@/i18n'
 import { resetStreamWatchdog, clearStreamWatchdog } from './useAiStream'
 import { startListener } from './useAiEvents'
-import { nextMsgId, findToolCall, startApprovalTimer, clearApprovalTimer, clearAllApprovalTimers } from './aiShared'
+import { nextMsgId, findToolCall, startApprovalTimer, clearApprovalTimer, clearAllApprovalTimers, resolveAiLang } from './aiShared'
 
 const t = ((i18n as any).global.t as (k: string, named?: Record<string, unknown>) => string).bind((i18n as any).global)
 
-const appSettings = useAppSettingsStore()
-
-/**
- * B-260617-03 DRY: 解析 AI 回复语言。
- *
- * df-ai-language='auto' → 回落到 df-language;否则用 df-ai-language 指定值。
- * doSend/regenerate/editMessage 三处复用(原各内联同一段表达式)。
- */
-function resolveLang(): string {
-  const raw = appSettings.get<string>('df-ai-language', 'auto')
-  return raw === 'auto'
-    ? appSettings.get<string>('df-language', 'zh-CN')
-    : raw
-}
-
 /// 待发送队列上限（超过抛错提示用户）
 const QUEUE_LIMIT = 10
 
@@ -114,7 +98,7 @@ async function doSend(text: string, skill?: string, force = false, parts?: Conte
   resetStreamWatchdog() // 启动流式看门狗,无数据超时兜底
 
   await startListener()
-  const lang = resolveLang()
+  const lang = resolveAiLang()
   try {
     // force=true 走 force_send IPC(复位残留 generating),否则走正常 send
     // F-01 阶段6: 透传 modelOverride(主对话专用,后端兜底校验池内才用)
@@ -170,7 +154,7 @@ async function regenerate() {
   resetStreamWatchdog()
 
   await startListener()
-  const lang = resolveLang()
+  const lang = resolveAiLang()
   const convId = state.activeConversationId
   if (!convId) {
     // 无活跃对话:回滚占位,报错
@@ -240,7 +224,7 @@ async function editMessage(newMessage: string) {
   resetStreamWatchdog()
 
   await startListener()
-  const lang = resolveLang()
+  const lang = resolveAiLang()
   const convId = state.activeConversationId
   if (!convId) {
     state.streaming = false