feat(links): align the friends page layout and submit UI

- assemble the friends template with page header, search cover, content position, widget zones and comments
- render the three page title styles and the tabbed search cover
- restore card, category nav and submit modal markup for the friends page
- add page content style support to the page editor
- port the linked card, category nav and submit modal styles to the mobile and desktop breakpoints

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/js/links-submit.js

@@ -30,6 +30,18 @@
     });
   }
 
+  function closeModal() {
+    var modal = document.getElementById('submit-links-modal');
+    if (!modal) return;
+    if (window.jQuery) {
+      window.jQuery(modal).modal('hide');
+      return;
+    }
+    modal.classList.remove('show', 'in', 'is-open');
+    modal.setAttribute('aria-hidden', 'true');
+    document.body.classList.remove('modal-open');
+  }
+
   form.addEventListener('submit', function (event) {
     event.preventDefault();
     if (button && button.disabled) return;
@@ -70,11 +82,7 @@
       if (button) button.disabled = false;
       if (button) button.innerHTML = original;
       if (captcha) captcha.reset('friend_link', form);
-      window.setTimeout(function () {
-        var modal = document.getElementById('submit-links-modal');
-        if (modal) modal.classList.remove('show', 'is-open');
-        setStatus('', '');
-      }, 1800);
+      window.setTimeout(closeModal, 1800);
     }).catch(function (error) {
       setStatus(error.message || i18n.error || '提交失败，请重试', 'danger');
       if (button) {
@@ -84,4 +92,12 @@
       if (captcha) captcha.reset('friend_link', form);
     });
   });
+
+  document.addEventListener('click', function (event) {
+    var dismiss = event.target.closest('#submit-links-modal [data-dismiss="modal"]');
+    if (dismiss) {
+      event.preventDefault();
+      closeModal();
+    }
+  });
 })();