✨ feat(vscode): 「改动」tab 重做为整 PR 聚合的主从式内联 diff（git-diff-view）

- 左树右 diff：左栏全 PR 文件树 + 统计条（共改 N · +X−Y · 已查看 M/N），右栏选中单文件内联 diff
- 用 @git-diff-view/react 只渲染当前选中文件，绕开上万行全量渲染的性能坑
- gitea 新增 listPullRequestFiles、getPullRequest 取 merge_base/head，按需回两版原文
- diff 走 merge_base→head 三点口径（与 Gitea 网页一致），getRawFile 404 兜底成全增/全删/改名
- 已查看态按 head sha 落盘、新 push 自然重置；去掉提交列表、原生 diff 与 spx-gitea 虚拟文档 provider

vscode/src/panel/KanbanPanel.ts

@@ -26,7 +26,7 @@ import { webhookCoordinator } from '../webhook/coordinator'
 import { loadYouTrackIssues } from '../youtrack/issueLoader'
 import * as issues from './handlers/issues'
 import * as managedSessions from './handlers/managedSessions'
-import * as prCommits from './handlers/prCommits'
+import * as prFiles from './handlers/prFiles'
 import * as sessions from './handlers/sessions'
 import * as settings from './handlers/settings'
 import * as terminals from './handlers/terminals'
@@ -546,30 +546,20 @@ export class KanbanWebviewPanel {
       managedSessions.handleManagedSessionsCloseTab(this, msg.sessionId)
       return
     }
-    if (msg.type === 'pr-commits/get') {
-      void prCommits.handleGetPrCommits(this, msg.issueNumber)
+    if (msg.type === 'pr-files/get') {
+      void prFiles.handleGetPrFiles(this, msg.issueNumber)
       return
     }
-    if (msg.type === 'pr-commit-files/get') {
-      void prCommits.handleGetPrCommitFiles(this, msg.issueNumber, msg.sha)
-      return
-    }
-    if (msg.type === 'pr-commit-diff/open') {
-      void prCommits.handleOpenPrCommitDiff(this, {
+    if (msg.type === 'pr-file-diff/get') {
+      void prFiles.handleGetPrFileDiff(this, {
         issueNumber: msg.issueNumber,
-        sha: msg.sha,
-        parentSha: msg.parentSha,
         path: msg.path,
-        status: msg.status,
+        previousPath: msg.previousPath,
       })
       return
     }
     if (msg.type === 'pr-review/set') {
-      void prCommits.handleSetPrReviewConfirmed(this, msg)
-      return
-    }
-    if (msg.type === 'pr-review/set-commits') {
-      void prCommits.handleSetPrReviewConfirmedCommits(this, msg)
+      void prFiles.handleSetPrReviewConfirmed(this, msg)
       return
     }
   }