fix: sidebar Gitea tree loading — race condition + silent errors + wrong Alpine scope

- loadGiteaTree: skip if giteaWorkspace component already loaded tree
- loadGiteaTree: check r.ok, add console.error logging, show error in UI
- loadGiteaTree: use .bind(this) for correct this in callbacks
- gitea_workspace.html: replace querySelector('[x-data]') with captured self
  in loadSidebarTree, loadSubdir, Private Pages click handlers
- Prevents loadGiteaTree from overwriting loadSidebarTree results
  on /gitea-workspace page

app/templates/gitea_workspace.html

@@ -218,8 +218,7 @@ function giteaWorkspace() {
           cb.style.cssText = 'flex-shrink:0;margin:0;display:none;';
           cb.addEventListener('click', function(ev) {
             ev.stopPropagation();
-            var gw = document.querySelector('[x-data]').__x.$data;
-            gw.selectItem(item.path, li, ev);
+            self.selectItem(item.path, li, ev);
           });
           li.appendChild(cb);
           // Icon
@@ -234,8 +233,7 @@ function giteaWorkspace() {
           nameSpan.addEventListener('dblclick', function(ev) {
             ev.preventDefault();
             ev.stopPropagation();
-            var gw = document.querySelector('[x-data]').__x.$data;
-            gw.startInlineRename(nameSpan, item.path, li);
+            self.startInlineRename(nameSpan, item.path, li);
           });
           li.appendChild(nameSpan);
           container.appendChild(li);
@@ -250,9 +248,8 @@ function giteaWorkspace() {
         pli.innerHTML = '<span class="page-icon">🔒</span><span class="page-name">Private Pages</span>';
         pli.addEventListener('click', function(e) {
           e.preventDefault(); e.stopPropagation();
-          var gw = document.querySelector('[x-data]').__x.$data;
-          gw.showPrivate = true; gw.showFile = false; gw.showEditor = false;
-          gw.loadPrivatePages();
+          self.showPrivate = true; self.showFile = false; self.showEditor = false;
+          self.loadPrivatePages();
         });
         container.appendChild(pli);
       } catch(e) { console.error('Sidebar tree load failed:', e); }
@@ -314,6 +311,7 @@ function giteaWorkspace() {
     },
 
     async loadSubdir(path, el) {
+      var self = this;
       // Check if already loaded
       var ul = el.querySelector('ul');
       if (ul) {
@@ -343,8 +341,7 @@ function giteaWorkspace() {
           cb.style.cssText = 'flex-shrink:0;margin:0;display:none;';
           cb.addEventListener('click', function(ev) {
             ev.stopPropagation();
-            var gw = document.querySelector('[x-data]').__x.$data;
-            gw.selectItem(child.path, li, ev);
+            self.selectItem(child.path, li, ev);
           });
           li.appendChild(cb);
           // Icon
@@ -358,8 +355,7 @@ function giteaWorkspace() {
           nameSpan.addEventListener('dblclick', function(ev) {
             ev.preventDefault();
             ev.stopPropagation();
-            var gw = document.querySelector('[x-data]').__x.$data;
-            gw.startInlineRename(nameSpan, child.path, li);
+            self.startInlineRename(nameSpan, child.path, li);
           });
           li.appendChild(nameSpan);
           ul.appendChild(li);