✨ feat: add dark/light theme toggle

apps/web/components/dashboard-layout.tsx

@@ -6,6 +6,7 @@ import { usePathname, useRouter } from "next/navigation";
 import { useEffect } from "react";
 import { BrandLockup } from "@/components/brand";
 import { FullScreenLoader } from "@/components/page-layout";
+import { ThemeToggle } from "@/components/theme-toggle";
 import { Avatar, AvatarFallback } from "@/components/ui/avatar";
 import { Button } from "@/components/ui/button";
 import {
@@ -161,6 +162,7 @@ export function DashboardLayout({ children }: { children: React.ReactNode }) {
           <span className="truncate font-mono text-[10px] font-bold uppercase tracking-[0.15em] text-muted-foreground">
             {currentPage ? `${currentPage.context} / ${currentPage.label}` : "Control plane"}
           </span>
+          <ThemeToggle className="ml-auto" />
         </header>
         <main className="min-w-0 flex-1 overflow-auto p-4 sm:p-6 lg:p-8">{children}</main>
       </SidebarInset>

apps/web/components/theme-provider.tsx

@@ -0,0 +1,11 @@
+"use client";
+
+import { ThemeProvider as NextThemesProvider } from "next-themes";
+import type * as React from "react";
+
+export function ThemeProvider({
+  children,
+  ...props
+}: React.ComponentProps<typeof NextThemesProvider>) {
+  return <NextThemesProvider {...props}>{children}</NextThemesProvider>;
+}

apps/web/components/theme-toggle.tsx

@@ -0,0 +1,59 @@
+"use client";
+
+import { Monitor, Moon, Sun } from "lucide-react";
+import { useTheme } from "next-themes";
+import { useEffect, useState } from "react";
+import { Button } from "@/components/ui/button";
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuRadioGroup,
+  DropdownMenuRadioItem,
+  DropdownMenuTrigger,
+} from "@/components/ui/dropdown-menu";
+import { cn } from "@/lib/cn";
+
+type ThemeToggleProps = {
+  className?: string;
+};
+
+export function ThemeToggle({ className }: ThemeToggleProps) {
+  const { theme, setTheme } = useTheme();
+  const [mounted, setMounted] = useState(false);
+
+  useEffect(() => {
+    setMounted(true);
+  }, []);
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button
+          variant="outline"
+          size="icon-sm"
+          className={cn("relative", className)}
+          aria-label="Toggle theme"
+        >
+          <Sun className="size-4 scale-100 rotate-0 transition-transform dark:scale-0 dark:-rotate-90" />
+          <Moon className="absolute size-4 scale-0 rotate-90 transition-transform dark:scale-100 dark:rotate-0" />
+        </Button>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent align="end" className="min-w-36">
+        <DropdownMenuRadioGroup value={mounted ? theme : undefined} onValueChange={setTheme}>
+          <DropdownMenuRadioItem value="light">
+            <Sun />
+            Light
+          </DropdownMenuRadioItem>
+          <DropdownMenuRadioItem value="dark">
+            <Moon />
+            Dark
+          </DropdownMenuRadioItem>
+          <DropdownMenuRadioItem value="system">
+            <Monitor />
+            System
+          </DropdownMenuRadioItem>
+        </DropdownMenuRadioGroup>
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
+}

apps/web/components/topology/topology-canvas.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { Background, BackgroundVariant, Controls, MiniMap, Panel, ReactFlow } from "@xyflow/react";
+import { useTheme } from "next-themes";
 import { useCallback, useMemo, useState } from "react";
 import "@xyflow/react/dist/style.css";
 import { useGraphLayout } from "@/hooks/use-graph-layout";
@@ -15,6 +16,7 @@ interface TopologyCanvasProps {
 }
 
 export function TopologyCanvas({ graph }: TopologyCanvasProps) {
+  const { resolvedTheme } = useTheme();
   const [selectedNode, setSelectedNode] = useState<TopologyNodeData | null>(null);
   const [filters, setFilters] = useState<TopologyFilters>({
     showServers: true,
@@ -68,24 +70,25 @@ export function TopologyCanvas({ graph }: TopologyCanvasProps) {
         }}
         minZoom={0.1}
         maxZoom={1.5}
+        colorMode={resolvedTheme === "dark" ? "dark" : "light"}
         defaultEdgeOptions={{
           animated: false,
           type: "smoothstep",
           style: {
-            stroke: "#6f7565",
+            stroke: "var(--muted-foreground)",
             strokeWidth: 2,
             strokeDasharray: "5 5",
           },
           markerEnd: {
             type: "arrowclosed",
-            color: "#6f7565",
+            color: "var(--muted-foreground)",
             width: 20,
             height: 20,
           },
         }}
         proOptions={{ hideAttribution: true }}
       >
-        <Background variant={BackgroundVariant.Lines} color="#d2d0c5" gap={32} size={1} />
+        <Background variant={BackgroundVariant.Lines} color="var(--border)" gap={32} size={1} />
         <Controls
           showZoom
           showFitView
@@ -103,7 +106,7 @@ export function TopologyCanvas({ graph }: TopologyCanvasProps) {
             };
             return colors[data.status] || "#94a3b8";
           }}
-          maskColor="rgba(29, 31, 26, 0.08)"
+          maskColor="color-mix(in oklch, var(--foreground) 8%, transparent)"
           className="border bg-card/95 shadow-md backdrop-blur-sm"
         />
 

apps/web/components/topology/topology-primitives.tsx

@@ -42,7 +42,7 @@ export function HealthBadge({
       healthy: "bg-green-500",
       degraded: "bg-yellow-500",
       unhealthy: "bg-red-500",
-      unknown: "bg-gray-400",
+      unknown: "bg-muted-foreground",
     }[status];
 
     return (
@@ -100,10 +100,10 @@ export function TopologyNodeCard({
     <div
       className={cn(
         "rounded-lg border bg-card p-3 shadow-md hover:shadow-lg transition-all w-[300px]",
-        selected && "ring-2 ring-primary ring-offset-2 shadow-xl"
+        selected && "ring-2 ring-primary ring-offset-2 ring-offset-background shadow-xl"
       )}
     >
-      <Handle type="target" position={Position.Top} className="w-3 h-3 !bg-gray-400" />
+      <Handle type="target" position={Position.Top} className="h-3 w-3 !bg-muted-foreground" />
       <div className="space-y-2.5">
         <div className="flex items-start justify-between gap-2">
           <div className="flex items-center gap-2 flex-1 min-w-0">
@@ -119,7 +119,7 @@ export function TopologyNodeCard({
         </div>
         {children}
       </div>
-      <Handle type="source" position={Position.Bottom} className="w-3 h-3 !bg-gray-400" />
+      <Handle type="source" position={Position.Bottom} className="h-3 w-3 !bg-muted-foreground" />
     </div>
   );
 }