refactor(header): improve mobile header layout with responsive action controls

src/app/page.tsx

@@ -15,7 +15,6 @@ import { DragDropContainer } from "@/components/drag-drop-container";
 import { EventDialog } from "@/components/event-dialog";
 import { EventsList } from "@/components/events-list";
 import { IcsFilePicker } from "@/components/ics-file-picker";
-import { ModeToggle } from "@/components/mode-toggle";
 import { SettingsPanel } from "@/components/settings-panel";
 import SignIn from "@/components/sign-in";
 import { Badge } from "@/components/ui/badge";
@@ -432,12 +431,21 @@ export default function HomePage() {
 		isMobile ? "px-4 pb-24 pt-4" : "px-8 py-4",
 	);
 	const appHeaderSurfaceClasses = getAppHeaderSurfaceClasses(isMobile);
+	const headerLayoutClasses = cn(
+		isMobile ? "flex-col items-start" : "items-center justify-between",
+	);
 	const appSectionSurfaceClasses = getAppSectionSurfaceClasses(isMobile);
 	const appNavSurfaceClasses = getAppNavSurfaceClasses(isMobile);
 	const mainContentClasses = cn(
 		"grid items-start gap-4",
 		isMobile ? "grid-cols-1" : "grid-cols-[minmax(0,0.75fr)_minmax(0,1.25fr)]",
 	);
+	const headerActionsClasses = isMobile
+		? "flex w-full items-center justify-between gap-2"
+		: "flex flex-wrap items-center justify-end gap-2";
+	const mobileUtilityActionsClasses = "flex items-center gap-2";
+	const desktopUtilityActionsClasses = "flex items-center gap-2";
+	const moreTriggerLabel = isMobile ? null : "More";
 
 	return (
 		<DragDropContainer
@@ -447,8 +455,13 @@ export default function HomePage() {
 			onImageDrop={(file) => handleImagesSelect([file])}
 		>
 			<div className={appFrameClasses}>
-				<header className={appHeaderSurfaceClasses}>
+				<header className={cn(appHeaderSurfaceClasses, headerLayoutClasses)}>
-					<div className="flex min-w-0 flex-col">
+					<div
+						className={cn(
+							"flex min-w-0 flex-col",
+							isMobile ? "w-full" : undefined,
+						)}
+					>
 						<p className="font-mono text-[11px] uppercase text-muted-foreground">
 							Local Calendar
 						</p>
@@ -456,7 +469,7 @@ export default function HomePage() {
 							Event timeline
 						</h1>
 					</div>
-					<div className="flex flex-wrap items-center justify-end gap-2">
+					<div className={headerActionsClasses}>
 						<Badge
 							variant="outline"
 							className={getConnectionBadgeClasses(isOnline)}
@@ -468,8 +481,15 @@ export default function HomePage() {
 							)}
 							<span>{isOnline ? "Online ready" : "Offline mode"}</span>
 						</Badge>
+						<div
+							className={
+								isMobile
+									? mobileUtilityActionsClasses
+									: desktopUtilityActionsClasses
+							}
+						>
 							<SignIn />
-						<ModeToggle />
+							{!isMobile && (
 								<Button
 									type="button"
 									variant="outline"
@@ -479,14 +499,28 @@ export default function HomePage() {
 								>
 									Export
 								</Button>
+							)}
 							<DropdownMenu>
 								<DropdownMenuTrigger asChild>
-								<Button type="button" variant="outline" size="sm">
+									<Button
+										type="button"
+										variant="outline"
+										size={isMobile ? "icon" : "sm"}
+										aria-label="More actions"
+									>
 										<MoreHorizontal className="h-4 w-4" />
-									More
+										{moreTriggerLabel}
 									</Button>
 								</DropdownMenuTrigger>
 								<DropdownMenuContent align="end" className="w-48">
+									{isMobile && (
+										<DropdownMenuItem
+											onClick={handleExport}
+											disabled={events.length === 0}
+										>
+											Export
+										</DropdownMenuItem>
+									)}
 									<DropdownMenuItem onClick={openManualEventDialog}>
 										Manual create
 									</DropdownMenuItem>
@@ -504,6 +538,7 @@ export default function HomePage() {
 								</DropdownMenuContent>
 							</DropdownMenu>
 						</div>
+					</div>
 				</header>
 
 				<main className="flex-1 space-y-4">

tests/home-page-layout.test.ts

@@ -7,6 +7,8 @@ describe("home page hierarchy", () => {
 
 		expect(source).toContain("useIsMobile");
 		expect(source).toContain("grid-cols-[minmax(0,0.75fr)_minmax(0,1.25fr)]");
+		expect(source).toContain('"items-center justify-between"');
+		expect(source).toContain("desktopUtilityActionsClasses");
 		expect(source).toContain("AI capture");
 		expect(source).toContain("Event timeline");
 	});
@@ -25,4 +27,43 @@ describe("home page hierarchy", () => {
 		expect(source).toContain("Import");
 		expect(source).toContain("Manual create");
 	});
+
+	test("mobile header gives controls their own full-width row so the title is not squeezed by actions", () => {
+		const source = readFileSync("src/app/page.tsx", "utf8");
+
+		expect(source).toContain("isMobile ? \"w-full\" : undefined");
+		expect(source).toContain("headerActionsClasses");
+		expect(source).toContain('"flex w-full items-center justify-between gap-2"');
+		expect(source).toContain("flex flex-wrap items-center justify-end gap-2");
+	});
+
+	test("mobile header keeps export inside the More menu instead of a dedicated button", () => {
+		const source = readFileSync("src/app/page.tsx", "utf8");
+
+		expect(source).toContain("!isMobile && (");
+		expect(source).toContain("Export");
+		expect(source).toContain("onClick={handleExport}");
+	});
+
+	test("mobile More trigger collapses to an icon button so utility actions fit on one row", () => {
+		const source = readFileSync("src/app/page.tsx", "utf8");
+
+		expect(source).toContain('size={isMobile ? "icon" : "sm"}');
+		expect(source).toContain("moreTriggerLabel");
+		expect(source).toContain('isMobile ? null : "More"');
+	});
+
+	test("mobile header omits the theme toggle so auth and overflow actions have a stable hierarchy", () => {
+		const source = readFileSync("src/app/page.tsx", "utf8");
+
+		expect(source).not.toContain("<ModeToggle />");
+	});
+
+	test("mobile header uses a column layout with a dedicated action row instead of desktop justify-between framing", () => {
+		const source = readFileSync("src/app/page.tsx", "utf8");
+
+		expect(source).toContain("headerLayoutClasses");
+		expect(source).toContain('isMobile ? "flex-col items-start"');
+		expect(source).toContain('"flex w-full items-center justify-between gap-2"');
+	});
 });