Make the command center stable and workspace-aware (#2749)

* feat(app): expand command center actions

Keep command center navigation stable by revealing only clipped rows without smooth centering. Prioritize a concise default list while making workspace, Git, pane, and creation actions searchable through the existing contribution and action-policy paths.

* test(app): search for query-only command action

Add project is intentionally absent from the unfiltered command center. Exercise the overlay flow through search before selecting it.

packages/app/src/screens/workspace/workspace-screen.tsx

@@ -3048,6 +3048,9 @@ function WorkspaceScreenContent({
         case "workspace.terminal.new":
           handleCreateTerminal();
           return true;
+        case "workspace.browser.new":
+          handleCreateBrowserTab();
+          return true;
         case "workspace.tab.close-current":
           if (activeTabId) {
             void handleCloseTabById(activeTabId);
@@ -3080,6 +3083,7 @@ function WorkspaceScreenContent({
       activeTabId,
       handleCloseTabById,
       handleCreateDraftTab,
+      handleCreateBrowserTab,
       handleCreateTerminal,
       navigateToTabId,
       tabs,
@@ -3194,6 +3198,7 @@ function WorkspaceScreenContent({
       "workspace.tab.navigate-index",
       "workspace.tab.navigate-relative",
       "workspace.terminal.new",
+      "workspace.browser.new",
     ] as const,
     enabled: Boolean(isRouteFocused && normalizedServerId && normalizedWorkspaceId),
     priority: 100,