feat: Add pop-out command route for standalone window rendering

Add a new /run route that allows windows to be opened in separate
browser windows/tabs without affecting the main workspace layout.

Changes:
- Add RunCommandPage component for /run?cmd=<command> route
- Add Pop Out button to WindowToolbar (ExternalLink icon)
- Parse command from URL query parameter and render result
- Construct minimal WindowInstance for rendering
- Display command string in header with clean minimal UI

This enables users to pop out any window into a separate browser
context while maintaining the main workspace layout, useful for
multi-monitor setups or keeping reference windows visible.

src/components/WindowToolbar.tsx

@@ -6,6 +6,7 @@ import {
   Copy,
   CopyCheck,
   ArrowRightFromLine,
+  ExternalLink,
 } from "lucide-react";
 import { useSetAtom } from "jotai";
 import { useState } from "react";
@@ -91,6 +92,21 @@ export function WindowToolbar({
     setShowSpellDialog(true);
   };
 
+  const handlePopOut = () => {
+    if (!window) return;
+
+    // Get command string (existing or reconstructed)
+    const commandString = window.commandString || reconstructCommand(window);
+
+    // Construct the /run URL with the command as a query parameter
+    const popOutUrl = `/run?cmd=${encodeURIComponent(commandString)}`;
+
+    // Open in a new window/tab
+    globalThis.window.open(popOutUrl, "_blank");
+
+    toast.success("Window popped out");
+  };
+
   // Copy functionality for NIPs
   const { copy, copied } = useCopy();
   const isNipWindow = window?.appId === "nip";
@@ -139,6 +155,18 @@ export function WindowToolbar({
             <Pencil className="size-4" />
           </Button>
 
+          {/* Pop Out button */}
+          <Button
+            variant="link"
+            size="icon"
+            className="text-muted-foreground"
+            onClick={handlePopOut}
+            title="Pop out window"
+            aria-label="Pop out window"
+          >
+            <ExternalLink className="size-4" />
+          </Button>
+
           {/* Copy button for NIPs */}
           {isNipWindow && (
             <Button

src/components/pages/RunCommandPage.tsx

@@ -0,0 +1,124 @@
+import { useEffect, useState } from "react";
+import { useSearchParams } from "react-router";
+import {
+  parseAndExecuteCommand,
+  type ParsedCommand,
+} from "@/lib/command-parser";
+import { useGrimoire } from "@/core/state";
+import { WindowRenderer } from "@/components/WindowRenderer";
+import { ExternalLink } from "lucide-react";
+
+/**
+ * RunCommandPage - Standalone command execution route
+ *
+ * Route: /run?cmd=<command>
+ *
+ * Executes a command and displays the result without affecting the workspace layout.
+ * This allows windows to be "popped out" into separate browser windows/tabs.
+ */
+export default function RunCommandPage() {
+  const [searchParams] = useSearchParams();
+  const { state } = useGrimoire();
+  const [parsed, setParsed] = useState<ParsedCommand | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  const cmdParam = searchParams.get("cmd");
+
+  useEffect(() => {
+    async function parseCommand() {
+      if (!cmdParam) {
+        setParsed({
+          commandName: "",
+          args: [],
+          fullInput: "",
+          error: "No command provided",
+        });
+        setLoading(false);
+        return;
+      }
+
+      try {
+        const result = await parseAndExecuteCommand(
+          cmdParam,
+          state.activeAccount?.pubkey,
+        );
+        setParsed(result);
+      } catch (error) {
+        setParsed({
+          commandName: "",
+          args: [],
+          fullInput: cmdParam,
+          error:
+            error instanceof Error ? error.message : "Failed to parse command",
+        });
+      } finally {
+        setLoading(false);
+      }
+    }
+
+    parseCommand();
+  }, [cmdParam, state.activeAccount?.pubkey]);
+
+  if (loading) {
+    return (
+      <div className="flex h-screen items-center justify-center bg-background">
+        <div className="text-muted-foreground">Loading command...</div>
+      </div>
+    );
+  }
+
+  if (!parsed || parsed.error || !parsed.command || !parsed.props) {
+    return (
+      <div className="flex h-screen items-center justify-center bg-background">
+        <div className="max-w-md rounded-lg border border-border bg-card p-6">
+          <h2 className="mb-2 text-lg font-semibold text-destructive">
+            Command Error
+          </h2>
+          <p className="mb-4 text-sm text-muted-foreground">
+            {parsed?.error || "Unknown error"}
+          </p>
+          {cmdParam && (
+            <p className="text-xs font-mono text-muted-foreground">
+              Command: {cmdParam}
+            </p>
+          )}
+        </div>
+      </div>
+    );
+  }
+
+  const title =
+    parsed.globalFlags?.windowProps?.title || parsed.command.name.toUpperCase();
+
+  // Construct a minimal WindowInstance for rendering
+  const windowInstance = {
+    id: "pop-out",
+    appId: parsed.command.appId,
+    props: parsed.props,
+    customTitle: parsed.globalFlags?.windowProps?.title,
+    commandString: parsed.fullInput,
+  };
+
+  return (
+    <div className="flex h-screen flex-col bg-background">
+      {/* Header */}
+      <div className="flex items-center justify-between border-b border-border bg-card px-4 py-2">
+        <div className="flex items-center gap-2">
+          <ExternalLink className="h-4 w-4 text-muted-foreground" />
+          <h1 className="text-sm font-semibold">{title}</h1>
+        </div>
+        <div className="text-xs font-mono text-muted-foreground">
+          {parsed.fullInput}
+        </div>
+      </div>
+
+      {/* Content */}
+      <div className="flex-1 overflow-hidden">
+        <WindowRenderer
+          window={windowInstance}
+          onClose={() => window.close()}
+        />
+      </div>
+    </div>
+  );
+}

src/root.tsx

@@ -3,6 +3,7 @@ import { AppShell } from "./components/layouts/AppShell";
 import DashboardPage from "./components/pages/DashboardPage";
 import SpellbookPage from "./components/pages/SpellbookPage";
 import Nip19PreviewRouter from "./components/pages/Nip19PreviewRouter";
+import RunCommandPage from "./components/pages/RunCommandPage";
 
 const router = createBrowserRouter([
   {
@@ -13,6 +14,10 @@ const router = createBrowserRouter([
       </AppShell>
     ),
   },
+  {
+    path: "/run",
+    element: <RunCommandPage />,
+  },
   {
     path: "/preview/:actor/:identifier",
     element: (