feat: redesign header to be compact with ASCII icon (#18713)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/cli/src/test-utils/render.tsx

@@ -528,12 +528,13 @@ export const mockSettings = new LoadedSettings(
 // A minimal mock UIState to satisfy the context provider.
 // Tests that need specific UIState values should provide their own.
 const baseMockUiState = {
+  history: [],
   renderMarkdown: true,
   streamingState: StreamingState.Idle,
   terminalWidth: 100,
   terminalHeight: 40,
   currentModel: 'gemini-pro',
-  terminalBackgroundColor: 'black',
+  terminalBackgroundColor: 'black' as const,
   cleanUiDetailsVisible: false,
   allowPlanMode: true,
   activePtyId: undefined,
@@ -552,6 +553,9 @@ const baseMockUiState = {
     warningText: '',
   },
   bannerVisible: false,
+  nightly: false,
+  updateInfo: null,
+  pendingHistoryItems: [],
 };
 
 export const mockAppState: AppState = {