Free Trial form in features grid: 2x3 layout, email + location + send

- features-grid changed to repeat(3, 1fr) for 2x3 layout
- 6th cell is a Free Trial card with midnight bg, brass border
- Email input, location dropdown (preselected to best ping server),
  brass Send button
- POST to webhook as JSON {email, location}
- On success: form hides, success message shown
- Responsive: 3col -> 2col -> 1col

index.html

@@ -137,6 +137,16 @@
             <h3>Support Bot &amp; Human Support</h3>
             <p>AI support bot for instant fixes. Human team for everything else. Your UUID is your key.</p>
           </div>
+          <div class="feature-card-trial" id="trialCard">
+            <h3>Free Trial</h3>
+            <p>Start your 30-day free trial. No credit card required.</p>
+            <form class="trial-form" id="trialForm">
+              <input type="email" id="trialEmail" placeholder="Your email address" required />
+              <select id="trialLocation"></select>
+              <button type="submit" class="btn btn-brass">Send</button>
+            </form>
+            <div class="trial-success" id="trialSuccess">&#10003; Check your inbox to confirm your email address.</div>
+          </div>
         </div>
       </div>
     </section>