fix: widget embed — full-width support + one-liner script tags via hosted loader

- Standalone page: ?width=full removes max-w-lg container constraint
- iframeSnippet: passes &width=full to URL when 100% width selected
- public/widget-loader.js: hosted script, reads data-* attrs, no inline code needed
  - data-mode="floating" → styled FAB button bottom-right
  - data-mode="trigger"  → listens for .hotelsync-book class clicks
  - Proper modal with close button and backdrop click
- Code tab snippets for floating/trigger are now single <script src> lines

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/widget-loader.js

@@ -0,0 +1,105 @@
+/* HotelSync Widget Loader — https://hotelsync.ru */
+(function () {
+  var s = document.currentScript || (function () {
+    var t = document.getElementsByTagName('script');
+    return t[t.length - 1];
+  })();
+
+  var url   = s.getAttribute('data-url') || '';
+  var mode  = s.getAttribute('data-mode') || 'floating';   // 'floating' | 'trigger'
+  var btn   = s.getAttribute('data-btn') || 'Забронировать';
+  var color = s.getAttribute('data-color') || '#4F46E5';
+  var cls   = s.getAttribute('data-class') || 'hotelsync-book';
+
+  function init() {
+    /* ── Modal ── */
+    var modal = document.createElement('div');
+    modal.style.cssText = [
+      'display:none', 'position:fixed', 'inset:0',
+      'background:rgba(0,0,0,.65)', 'z-index:99999',
+      'align-items:center', 'justify-content:center',
+      'padding:16px', 'box-sizing:border-box',
+    ].join(';');
+
+    var inner = document.createElement('div');
+    inner.style.cssText = [
+      'position:relative', 'width:100%', 'max-width:520px',
+      'border-radius:20px', 'overflow:hidden',
+      'box-shadow:0 24px 80px rgba(0,0,0,.45)',
+    ].join(';');
+
+    var closeBtn = document.createElement('button');
+    closeBtn.innerHTML = '×';
+    closeBtn.style.cssText = [
+      'position:absolute', 'top:10px', 'right:10px', 'z-index:1',
+      'width:32px', 'height:32px', 'border-radius:50%',
+      'background:rgba(0,0,0,.55)', 'color:#fff',
+      'border:none', 'cursor:pointer', 'font-size:20px',
+      'font-weight:700', 'line-height:1',
+      'display:flex', 'align-items:center', 'justify-content:center',
+    ].join(';');
+    closeBtn.onclick = function () { modal.style.display = 'none'; };
+
+    var iframe = document.createElement('iframe');
+    iframe.src = url;
+    iframe.setAttribute('allow', 'payment');
+    iframe.style.cssText = 'width:100%;height:680px;border:none;display:block;';
+
+    inner.appendChild(closeBtn);
+    inner.appendChild(iframe);
+    modal.appendChild(inner);
+    modal.addEventListener('click', function (e) {
+      if (e.target === modal) modal.style.display = 'none';
+    });
+    document.body.appendChild(modal);
+
+    window.hsOpenWidget = function () { modal.style.display = 'flex'; };
+
+    /* ── Floating button ── */
+    if (mode === 'floating') {
+      var fab = document.createElement('button');
+      fab.textContent = btn;
+      fab.style.cssText = [
+        'position:fixed', 'bottom:24px', 'right:24px',
+        'background:' + color, 'color:#fff',
+        'border:none', 'padding:14px 26px',
+        'border-radius:50px', 'font-size:15px',
+        'font-family:inherit', 'font-weight:700',
+        'cursor:pointer', 'z-index:99997',
+        'box-shadow:0 4px 20px rgba(0,0,0,.28)',
+        'transition:transform .15s,box-shadow .15s',
+      ].join(';');
+      fab.onmouseenter = function () {
+        fab.style.transform = 'scale(1.06)';
+        fab.style.boxShadow = '0 8px 28px rgba(0,0,0,.38)';
+      };
+      fab.onmouseleave = function () {
+        fab.style.transform = 'scale(1)';
+        fab.style.boxShadow = '0 4px 20px rgba(0,0,0,.28)';
+      };
+      fab.onclick = function () { window.hsOpenWidget(); };
+      document.body.appendChild(fab);
+    }
+
+    /* ── Class trigger ── */
+    if (mode === 'trigger') {
+      document.addEventListener('click', function (e) {
+        var el = e.target;
+        while (el) {
+          if (el.classList && el.classList.contains(cls)) {
+            e.preventDefault();
+            window.hsOpenWidget();
+            return;
+          }
+          el = el.parentElement;
+        }
+      });
+    }
+  }
+
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', init);
+  } else {
+    init();
+  }
+})();