fix(coding-agent): tighten startup splash review coverage

packages/coding-agent/src/startup-splash.ts

@@ -1,3 +1,4 @@
+/** Inputs used to decide whether the optional startup splash may run for this process. */
 export interface StartupSplashDecisionOptions {
 	readonly configured: boolean;
 	readonly isInteractive: boolean;
@@ -8,6 +9,7 @@ export interface StartupSplashDecisionOptions {
 	readonly stdoutIsTTY: boolean | undefined;
 }
 
+/** Returns true only for explicitly enabled, normal interactive TTY startup. */
 export function shouldShowStartupSplash(options: StartupSplashDecisionOptions): boolean {
 	if (!options.configured) return false;
 	if (!options.isInteractive) return false;

packages/coding-agent/test/startup-splash.test.ts

@@ -32,19 +32,24 @@ describe("startup splash", () => {
 	});
 
 	it("shows and hides a fullscreen setup-splash overlay", async () => {
+		const preSplashEditor: Component = { render: () => [] };
 		let hidden = false;
 		let renderRequests = 0;
-		let focused: Component | undefined;
+		let focused: Component | undefined = preSplashEditor;
 		let overlayComponent: Component | undefined;
-
 		const ctx = {
 			ui: {
 				terminal: { rows: 8 },
 				showOverlay: (component: Component) => {
 					overlayComponent = component;
+					const preFocus = focused;
+					focused = component;
 					return {
 						hide: () => {
 							hidden = true;
+							if (focused === component) {
+								focused = preFocus;
+							}
 						},
 					};
 				},
@@ -61,7 +66,7 @@ describe("startup splash", () => {
 
 		expect(hidden).toBe(true);
 		expect(renderRequests).toBeGreaterThan(0);
-		expect(focused).toBe(overlayComponent);
+		expect(focused).toBe(preSplashEditor);
 		expect(overlayComponent?.render(32)).toHaveLength(8);
 	});
 });