Add browser save and update workflow

browser/extension/content.js

@@ -396,6 +396,22 @@ function fillCredential(credential, targetDescriptor) {
   return { ok: true };
 }
 
+function submittedCredential(candidate, rawURL) {
+  if (!candidate?.passwordInput) {
+    return null;
+  }
+  const password = String(candidate.passwordInput.value || "").trim();
+  if (!password) {
+    return null;
+  }
+  return {
+    title: domainLabel(rawURL),
+    username: String(candidate.usernameInput?.value || "").trim(),
+    password,
+    url: String(rawURL || "").trim()
+  };
+}
+
 function domainLabel(rawURL) {
   try {
     return new URL(rawURL).host || "";
@@ -447,7 +463,8 @@ const contentTestExports = {
   fieldHintText,
   scopeHintText,
   hasAuthFlowSignals,
-  authFlowCandidate
+  authFlowCandidate,
+  submittedCredential
 };
 
 if (isNodeTestEnv) {
@@ -805,6 +822,23 @@ if (isNodeTestEnv) {
     scheduleRefresh(false);
   }, true);
 
+  document.addEventListener("submit", (event) => {
+    const form = event.target instanceof HTMLFormElement ? event.target : null;
+    if (!form) {
+      return;
+    }
+    const passwordInput = visibleInputs(form).find(isPasswordCandidate) || null;
+    const candidate = passwordInput ? authFlowCandidate(passwordInput) : null;
+    const observed = submittedCredential(candidate, window.location.href);
+    if (!observed) {
+      return;
+    }
+    void runtimeSend({
+      type: "keepassgo-observed-login",
+      observed
+    }).catch(() => null);
+  }, true);
+
   document.addEventListener("click", (event) => {
     if (!root.contains(event.target)) {
       chooserOpen = false;