优化: 前端批(审批体系一致 + GitChanges UI + token/控件统一 + 死代码)

审批体系一致:ApprovalPopup 浮窗加挂起时长提示(H1)+session 按钮+path deny 二次确认(M4/M5);ToolCard/useToolApproval 加 session+onDeny 确认(对齐 DirAuthDialog 四按钮)+ToolCardList decision 类型加 session;ApprovalDialog 失败显 toast(治 store 吞错 M31);ApprovalOverlay dismiss 改响应式(L26)

GitChanges UI(问题12 前端 12b-12h):showCommitFileDiff 精确匹配(12b)+去重 git log(12c)+详情滑出不挤压(12d)+双行提交行(12f)+搜索过滤(12g)+历史 Tab 显分支(12h)+diff 侧边栏内更宽可折叠面板(12e:FilePreview 不支持任意提交 diff,折中)

token+控件:global.css 定义 --df-primary(治幽灵变量 M26)+settings.css 加 .setting-number/.setting-input/.setting-textarea+4 Section 套用(问题8)

死代码:删 PlanProgress.vue(零引用)+PlanLayerInfo 类型+i18n 孤儿 key(L1)

src/i18n/en/gitChanges.ts

@@ -6,6 +6,11 @@ export default {
     noChanges: 'No changes (clean working tree)',
     noDiff: 'No diff available',
     noCommits: 'No commits yet',
+    noSearchResult: 'No matching commits',
+    commitsUnit: 'commits',
+    searchPlaceholder: 'Search commits (keyword/author)',
+    expand: 'Expand',
+    collapse: 'Collapse',
     modified: 'Modified',
     added: 'Added',
     deleted: 'Deleted',