docs: standardize signup terminology and fix links

pages/guide/getting-started/access-dashboard.mdx

@@ -22,7 +22,7 @@ The fastest way to log in. Click **Continue with Google** or **Continue with Git
 <Callout type="info" emoji={<Info className="w-5 h-5" />}>
 **SSO Behavior:**
 *   **Existing Users:** You can only Log In via SSO if your email address is already registered.
-*   **New Users:** You can **Register** a new account instantly by clicking the Social Login buttons on the *Sign In* or *Register* page.
+*   **New Users:** You can **Register** a new account instantly by clicking the Social Login buttons on the *Sign In* or *Sign Up* page.
 </Callout>
 
 ### 2. Magic Link
@@ -93,4 +93,4 @@ If you lose access to your account, you can reset your password securely.
 
 ### Access Denied / User Not Found
 *   **Typos**: Double-check your email address.
-*   **Not Registered**: If you haven't created an account yet, please **Sign Up** first. You cannot log in via SSO if your email is not in our system (unless you use the Register flow).
+*   **Not Registered**: If you haven't created an account yet, please **Sign Up** first. You cannot log in via SSO if your email is not in our system (unless you use the Sign Up flow).

theme.config.tsx

@@ -15,7 +15,7 @@ const config: DocsThemeConfig = {
     link: 'https://github.com/dyzulk/trustlab-docs',
   },
   chat: {
-    link: 'https://trustlab.dyzulk.com/dashboard/',
+    link: 'https://trustlab.dyzulk.com/dashboard',
     icon: (
       <span className="text-sm font-semibold bg-blue-600/10 text-blue-600 dark:text-blue-400 px-3 py-1.5 rounded-full hover:bg-blue-600/20 transition-colors">
         Go to Dashboard →