fix(mac): re-ensure remote gateway tunnel

apps/macos/Sources/Clawdis/GatewayConnection.swift

@@ -109,11 +109,15 @@ actor GatewayConnection {
         do {
             return try await client.request(method: method, params: params, timeoutMs: timeoutMs)
         } catch {
+            if error is GatewayResponseError || error is GatewayDecodingError {
+                throw error
+            }
+
             // Auto-recover in local mode by spawning/attaching a gateway and retrying a few times.
             // Canvas interactions should "just work" even if the local gateway isn't running yet.
-            let isLocal = await MainActor.run { AppStateStore.shared.connectionMode == .local }
+            let mode = await MainActor.run { AppStateStore.shared.connectionMode }
-            guard isLocal else { throw error }
+            switch mode {
-
+            case .local:
                 await MainActor.run { GatewayProcessManager.shared.setActive(true) }
 
                 var lastError: Error = error
@@ -127,6 +131,39 @@ actor GatewayConnection {
                 }
 
                 throw lastError
+            case .remote:
+                let nsError = error as NSError
+                guard nsError.domain == URLError.errorDomain else { throw error }
+
+                var lastError: Error = error
+                await RemoteTunnelManager.shared.stopAll()
+                do {
+                    _ = try await GatewayEndpointStore.shared.ensureRemoteControlTunnel()
+                } catch {
+                    lastError = error
+                }
+
+                for delayMs in [150, 400, 900] {
+                    try await Task.sleep(nanoseconds: UInt64(delayMs) * 1_000_000)
+                    do {
+                        let cfg = try await self.configProvider()
+                        await self.configure(url: cfg.url, token: cfg.token)
+                        guard let client = self.client else {
+                            throw NSError(
+                                domain: "Gateway",
+                                code: 0,
+                                userInfo: [NSLocalizedDescriptionKey: "gateway not configured"])
+                        }
+                        return try await client.request(method: method, params: params, timeoutMs: timeoutMs)
+                    } catch {
+                        lastError = error
+                    }
+                }
+
+                throw lastError
+            case .unconfigured:
+                throw error
+            }
         }
     }