Show workspace commits clearly in Changes (#2350)

* feat(commits): distinguish workspace history from base commits

Keep every workspace commit visible while bounding base history to ten
context commits, and make push and base state readable in the commit rail.

* fix(commits): preserve history when base refs disappear

Fall back to recent HEAD history for stale saved bases, and reject truncated
git output instead of presenting an incomplete commit list.

* fix(commits): classify history against the current base

Use the furthest-ahead local or remote base for classification, and re-infer
base history when saved worktree metadata points to a deleted branch.

packages/app/src/i18n/resources/zh-CN.ts

@@ -787,7 +787,7 @@ export const zhCN: TranslationResources = {
         deletedFile: "已删除",
         commits: {
           title: "提交",
-          countLabel: "最近 {{count}} 个提交",
+          countLabel: "{{count}} 个工作区提交",
           fileDiffEmpty: "没有可显示的更改",
           fileDiffError: "加载文件差异失败",
           loading: "正在加载提交…",