fix(extension): detect browser error pages earlier

- Add shared browser error URL detection for Chrome, Edge, Brave, and Firefox-style about:error pages.
- Short-circuit read-only DOM and HTML commands with safe fallbacks when tabs are already on browser error pages.
- Fail navigation waits, DOM waits, polling, and URL watches with clearer error-page messages.
- Bump package and extension version to 0.9.8 and extend regression coverage for cross-browser error-page handling.

extension/src/core.ts

@@ -5,9 +5,26 @@ export async function getProfileAlias() {
   return profileAlias || "default";
 }
 
+export function isBrowserErrorUrl(url) {
+  const value = String(url || "").toLowerCase();
+  return value.startsWith("chrome-error://") ||
+         value.startsWith("edge-error://") ||
+         value.startsWith("brave-error://") ||
+         value.startsWith("about:neterror") ||
+         value.startsWith("about:certerror") ||
+         value.startsWith("about:blocked") ||
+         value.startsWith("about:tabcrashed");
+}
+
 export function isErrorPageScriptError(error) {
-  const message = String(error?.message || error || "");
-  return message.includes("error page") || message.includes("chrome-error://chromewebdata");
+  const message = String(error?.message || error || "").toLowerCase();
+  return message.includes("error page") ||
+         message.includes("chrome-error://") ||
+         message.includes("edge-error://") ||
+         message.includes("brave-error://") ||
+         message.includes("about:neterror") ||
+         message.includes("about:certerror") ||
+         message.includes("about:tabcrashed");
 }
 
 export function isTransientScriptError(error) {