refactor(shared): dedupe common OpenClawKit helpers

apps/shared/OpenClawKit/Sources/OpenClawKit/WebViewJavaScriptSupport.swift

@@ -0,0 +1,57 @@
+import Foundation
+import WebKit
+
+public enum WebViewJavaScriptSupport {
+    @MainActor
+    public static func applyDebugStatus(
+        webView: WKWebView,
+        enabled: Bool,
+        title: String?,
+        subtitle: String?)
+    {
+        let js = """
+        (() => {
+          try {
+            const api = globalThis.__openclaw;
+            if (!api) return;
+            if (typeof api.setDebugStatusEnabled === 'function') {
+              api.setDebugStatusEnabled(\(enabled ? "true" : "false"));
+            }
+            if (!\(enabled ? "true" : "false")) return;
+            if (typeof api.setStatus === 'function') {
+              api.setStatus(\(self.jsValue(title)), \(self.jsValue(subtitle)));
+            }
+          } catch (_) {}
+        })()
+        """
+        webView.evaluateJavaScript(js) { _, _ in }
+    }
+
+    @MainActor
+    public static func evaluateToString(webView: WKWebView, javaScript: String) async throws -> String {
+        try await withCheckedThrowingContinuation { cont in
+            webView.evaluateJavaScript(javaScript) { result, error in
+                if let error {
+                    cont.resume(throwing: error)
+                    return
+                }
+                if let result {
+                    cont.resume(returning: String(describing: result))
+                } else {
+                    cont.resume(returning: "")
+                }
+            }
+        }
+    }
+
+    public static func jsValue(_ value: String?) -> String {
+        guard let value else { return "null" }
+        if let data = try? JSONSerialization.data(withJSONObject: [value]),
+           let encoded = String(data: data, encoding: .utf8),
+           encoded.count >= 2
+        {
+            return String(encoded.dropFirst().dropLast())
+        }
+        return "null"
+    }
+}