✨ feat(vscode): 代码阅读侧栏加「未提交的更改」筛选

- 标题栏新按钮「未提交的更改」：树里只剩工作区各 git 仓库里没提交的文件（暂存、没暂存、未跟踪、合并冲突），每个有改动的仓库一个根，跟着 git 状态自动重摆；上色和徽标交给 VS Code 自带的 git 装饰
- 两种筛选互斥，由 TreeFilters 统一管，上下文键合并成 superpowers.codeReader.filter（review / uncommitted）
- 改动文件树改成多根，buildChangedTree 挪到 explorer/changedTree 并改吃 {path, change}
- 内置 git 扩展 API 的类型和加载抽到 src/git/gitApi、gitExtension，提交按钮的监听也改用它
- 文件注释按文件所在的工作区文件夹记，不看树从哪个根摆下来

vscode/package.json

@@ -109,6 +109,12 @@
         "category": "代码阅读",
         "icon": "$(git-pull-request)"
       },
+      {
+        "command": "superpowers.codeReader.showUncommitted",
+        "title": "未提交的更改",
+        "category": "代码阅读",
+        "icon": "$(git-commit)"
+      },
       {
         "command": "superpowers.codeReader.showAllFiles",
         "title": "显示全部",
@@ -255,14 +261,19 @@
           "group": "navigation@1"
         },
         {
-          "command": "superpowers.codeReader.showAllFiles",
-          "when": "view == superpowers.codeReader.files && superpowers.codeReader.reviewing",
+          "command": "superpowers.codeReader.showUncommitted",
+          "when": "view == superpowers.codeReader.files",
           "group": "navigation@2"
         },
+        {
+          "command": "superpowers.codeReader.showAllFiles",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter",
+          "group": "navigation@3"
+        },
         {
           "command": "superpowers.codeReader.refresh",
           "when": "view == superpowers.codeReader.files",
-          "group": "navigation@3"
+          "group": "navigation@4"
         }
       ],
       "view/item/context": [
@@ -273,12 +284,12 @@
         },
         {
           "command": "superpowers.codeReader.addNote",
-          "when": "view == superpowers.codeReader.files && !superpowers.codeReader.reviewing && viewItem =~ /^(file|folder)$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder)$/",
           "group": "inline@2"
         },
         {
           "command": "superpowers.codeReader.editNote",
-          "when": "view == superpowers.codeReader.files && !superpowers.codeReader.reviewing && viewItem =~ /^(file|folder) noted$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder) noted$/",
           "group": "inline@2"
         },
         {
@@ -308,12 +319,12 @@
         },
         {
           "command": "superpowers.codeReader.addNote",
-          "when": "view == superpowers.codeReader.files && !superpowers.codeReader.reviewing && viewItem =~ /^(file|folder)$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder)$/",
           "group": "notes"
         },
         {
           "command": "superpowers.codeReader.editNote",
-          "when": "view == superpowers.codeReader.files && !superpowers.codeReader.reviewing && viewItem =~ /^(file|folder) noted$/",
+          "when": "view == superpowers.codeReader.files && superpowers.codeReader.filter != review && viewItem =~ /^(file|folder) noted$/",
           "group": "notes"
         }
       ],
@@ -336,7 +347,7 @@
         },
         {
           "command": "superpowers.codeReader.showAllFiles",
-          "when": "superpowers.codeReader.reviewing"
+          "when": "superpowers.codeReader.filter"
         },
         {
           "command": "superpowers.codeReader.showPreview",