Send tab defaults with presets.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/templates/index.html

@@ -176,6 +176,7 @@
             </div>
             <div class="modal-actions">
                 <button class="btn btn-secondary" id="preset-send-btn">Try</button>
+                <button class="btn btn-secondary" id="preset-default-btn">Default</button>
                 <button class="btn btn-primary" id="preset-save-btn">Save &amp; Send</button>
                 <button class="btn btn-danger" id="preset-remove-from-tab-btn">Remove from Tab</button>
                 <button class="btn btn-secondary" id="preset-clear-btn">Clear</button>