🐛 Ignore posthog exceptions in unhandled exception handler (#8629)

PostHog recorder throws errors like 'Cannot assign to read only property
'assert' of object' which are unrelated to the application and should be
ignored to prevent noise in error reporting.

frontend/src/app/main/errors.cljs

@@ -337,9 +337,15 @@
                    (or (str/includes? stack "chrome-extension://")
                        (str/includes? stack "moz-extension://")))))
 
+          (from-posthog? [cause]
+            (let [stack (.-stack cause)]
+              (and (string? stack)
+                   (str/includes? stack "posthog"))))
+
           (is-ignorable-exception? [cause]
             (let [message (ex-message cause)]
               (or (from-extension? cause)
+                  (from-posthog? cause)
                   (= message "Possible side-effect in debug-evaluate")
                   (= message "Unexpected end of input")
                   (str/starts-with? message "invalid props on component")