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/en.ts

@@ -598,8 +598,6 @@ export const en = {
         pullRequest: "Pull request",
         terminalProfilesMenu: "Terminal profiles",
         editTerminalProfiles: "Edit profiles…",
-        pinTarget: "Pin",
-        unpinTarget: "Unpin",
       },
       explorer: {
         open: "Open explorer",
@@ -864,14 +862,12 @@ export const en = {
         switchToUnified: "Switch to unified diff",
         switchToSplit: "Switch to side-by-side diff",
         showTreeView: "Show folder tree",
-        showFlatView: "Show flat file list",
+        hideTreeView: "Hide folder tree",
         options: "Diff options",
         hideWhitespace: "Hide whitespace",
         showWhitespace: "Show whitespace",
         scrollLongLines: "Scroll long lines",
         wrapLongLines: "Wrap long lines",
-        collapseAll: "Collapse all files",
-        expandAll: "Expand all files",
         collapseAllFolders: "Collapse all folders",
         expandAllFolders: "Expand all folders",
         refreshing: "Refreshing",