fix(js): keep the current URL when pushState/replaceState omit url

resolveOrFallback(undefined) returned undefined, so applyVirtual set
__virtualUrl to null and location reverted to the document URL. Per the HTML
spec a missing url keeps the current document URL; return __currentUrl() so the
new history entry captures the current location instead of clearing it.

Fixes #496

crates/obscura-js/js/bootstrap.js

@@ -5613,7 +5613,10 @@ globalThis.atob = globalThis.atob || ((s) => { const c="ABCDEFGHIJKLMNOPQRSTUVWX
   const stack = [{state: null, url: undefined}]; // initial entry; url=undefined means "use document URL"
   let idx = 0;
   const resolveOrFallback = (url) => {
-    if (url === null || url === undefined) return undefined;
+    // A missing url (pushState/replaceState called with < 3 args) keeps the
+    // current document URL per the HTML spec — capture it so the entry does not
+    // reset location back to the original document URL.
+    if (url === null || url === undefined) return __currentUrl();
     try { return new URL(String(url), __currentUrl()).href; } catch (e) { return String(url); }
   };
   const applyVirtual = () => {

crates/obscura-js/src/runtime.rs

@@ -1317,6 +1317,28 @@ mod tests {
         rt
     }
 
+    #[test]
+    fn replace_state_without_url_preserves_current_location() {
+        let mut rt = setup_runtime("<html><body></body></html>");
+        let path = rt
+            .evaluate(
+                "(function(){history.pushState({}, '', '/dashboard'); history.replaceState({scroll:1}); return location.pathname;})()",
+            )
+            .unwrap();
+        assert_eq!(path, serde_json::json!("/dashboard"));
+    }
+
+    #[test]
+    fn push_state_without_url_preserves_current_location() {
+        let mut rt = setup_runtime("<html><body></body></html>");
+        let path = rt
+            .evaluate(
+                "(function(){history.pushState({}, '', '/a'); history.pushState({b:1}); return location.pathname;})()",
+            )
+            .unwrap();
+        assert_eq!(path, serde_json::json!("/a"));
+    }
+
     #[test]
     fn test_document_title() {
         let mut rt = setup_runtime("<html><head><title>Test</title></head><body></body></html>");