feat(app): polish workspace tabs and changes

Size tabs from rendered labels and switch to horizontal overflow once minimum click targets are reached, keeping the add-tab action adjacent until it must remain fixed.

Make Changes an always-expanded document with an optional desktop navigation tree, keep Git actions in their platform-owned headers, remove pinned and inline split shortcuts, and place review tabs beside Changes.

packages/app/src/i18n/resources/ja.ts

@@ -605,8 +605,6 @@ export const ja: TranslationResources = {
         pullRequest: "プルリクエスト",
         terminalProfilesMenu: "ターミナルプロファイル",
         editTerminalProfiles: "プロファイルを編集…",
-        pinTarget: "ピン留め",
-        unpinTarget: "ピン留めを解除",
       },
       explorer: {
         open: "エクスプローラーを開く",
@@ -866,14 +864,12 @@ export const ja: TranslationResources = {
         switchToUnified: "ユニファイド差分に切り替え",
         switchToSplit: "左右比較差分に切り替え",
         showTreeView: "フォルダツリーを表示",
-        showFlatView: "フラットなファイル一覧を表示",
+        hideTreeView: "フォルダツリーを非表示",
         options: "差分オプション",
         hideWhitespace: "空白を非表示",
         showWhitespace: "空白を表示",
         scrollLongLines: "長い行をスクロール",
         wrapLongLines: "長い行を折り返す",
-        collapseAll: "すべて折りたたむ",
-        expandAll: "すべて展開",
         collapseAllFolders: "すべてのフォルダを折りたたむ",
         expandAllFolders: "すべてのフォルダを展開",
         refreshing: "更新中",