fix lightpanda (#1050)

* fix lightpanda

* fmt

packages/dashboard/src/components/viewport.tsx

@@ -194,14 +194,20 @@ export function Viewport() {
     addressRef.current?.blur();
 
     const target = normalizeUrl(addressValue);
+    const previousUrl = url;
     setAddressValue(target);
     setNavigating(true);
     try {
-      await runCmd("navigate", target);
+      const result = await runCmd("navigate", target);
+      if (!result.success) {
+        setAddressValue(previousUrl || "about:blank");
+      }
+    } catch {
+      setAddressValue(previousUrl || "about:blank");
     } finally {
       setNavigating(false);
     }
-  }, [addressValue, navigating, runCmd]);
+  }, [addressValue, navigating, runCmd, url]);
 
   const drawFrame = useCallback((base64: string) => {
     const canvas = canvasRef.current;

packages/dashboard/src/lib/exec.ts

@@ -8,12 +8,21 @@ export interface ExecResult {
 }
 
 export async function execCommand(args: string[]): Promise<ExecResult> {
-  const resp = await fetch(`http://localhost:${DASHBOARD_PORT}/api/exec`, {
-    method: "POST",
-    headers: { "Content-Type": "application/json" },
-    body: JSON.stringify({ args }),
-  });
-  return resp.json();
+  try {
+    const resp = await fetch(`http://localhost:${DASHBOARD_PORT}/api/exec`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ args }),
+    });
+    return resp.json();
+  } catch {
+    return {
+      success: false,
+      exit_code: null,
+      stdout: "",
+      stderr: "Network error: dashboard server unreachable",
+    };
+  }
 }
 
 export function sessionArgs(session: string, ...args: string[]): string[] {
@@ -21,10 +30,14 @@ export function sessionArgs(session: string, ...args: string[]): string[] {
 }
 
 export async function killSession(session: string): Promise<{ success: boolean; killed_pid?: number }> {
-  const resp = await fetch(`http://localhost:${DASHBOARD_PORT}/api/kill`, {
-    method: "POST",
-    headers: { "Content-Type": "application/json" },
-    body: JSON.stringify({ session }),
-  });
-  return resp.json();
+  try {
+    const resp = await fetch(`http://localhost:${DASHBOARD_PORT}/api/kill`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ session }),
+    });
+    return resp.json();
+  } catch {
+    return { success: false };
+  }
 }