feat: add new layout system (Slack/ClickUp inspired)

surfsense_web/components/layout/ui/header/Header.tsx

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+"use client";
+
+import { Moon, Sun } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";
+
+interface HeaderProps {
+	breadcrumb?: React.ReactNode;
+	languageSwitcher?: React.ReactNode;
+	theme?: string;
+	onToggleTheme?: () => void;
+	mobileMenuTrigger?: React.ReactNode;
+}
+
+export function Header({
+	breadcrumb,
+	languageSwitcher,
+	theme,
+	onToggleTheme,
+	mobileMenuTrigger,
+}: HeaderProps) {
+	return (
+		<header className="sticky top-0 z-10 flex h-14 shrink-0 items-center gap-2 border-b bg-background/95 backdrop-blur supports-backdrop-filter:bg-background/60 px-4">
+			{/* Left side - Mobile menu trigger + Breadcrumb */}
+			<div className="flex flex-1 items-center gap-2 min-w-0">
+				{mobileMenuTrigger}
+				{breadcrumb}
+			</div>
+
+			{/* Right side - Actions */}
+			<div className="flex items-center gap-2">
+				{/* Theme toggle */}
+				{onToggleTheme && (
+					<Tooltip>
+						<TooltipTrigger asChild>
+							<Button variant="outline" size="icon" onClick={onToggleTheme} className="h-8 w-8">
+								{theme === "dark" ? <Sun className="h-4 w-4" /> : <Moon className="h-4 w-4" />}
+								<span className="sr-only">Toggle theme</span>
+							</Button>
+						</TooltipTrigger>
+						<TooltipContent>{theme === "dark" ? "Light mode" : "Dark mode"}</TooltipContent>
+					</Tooltip>
+				)}
+
+				{languageSwitcher}
+			</div>
+		</header>
+	);
+}

surfsense_web/components/layout/ui/header/index.ts

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+export { Header } from "./Header";