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/base.html

@@ -877,14 +877,28 @@
           .catch(err => { this.toast('Failed to create sub-page: ' + err.message, 'error'); });
       },
       loadGiteaTree() {
-        if (!this.giteaWorkspace || !this.giteaOwner || !this.giteaRepo) return;
+        if (!this.giteaWorkspace || !this.giteaOwner || !this.giteaRepo) {
+          console.log('loadGiteaTree: skipped (giteaWorkspace=' + this.giteaWorkspace + ', owner=' + this.giteaOwner + ', repo=' + this.giteaRepo + ')');
+          return;
+        }
+        // Skip if giteaWorkspace component already loaded the tree (has data-gitea-path items)
+        var container = document.getElementById('sidebar-workspace-items');
+        if (container && container.querySelector('[data-gitea-path]')) {
+          console.log('loadGiteaTree: skipped (tree already loaded by giteaWorkspace component)');
+          return;
+        }
+        console.log('loadGiteaTree: fetching /api/gitea/projects/' + this.giteaOwner + '/' + this.giteaRepo + '/tree');
         fetch('/api/gitea/projects/' + this.giteaOwner + '/' + this.giteaRepo + '/tree')
-          .then(r => r.json())
-          .then(data => {
+          .then(function(r) {
+            if (!r.ok) throw new Error('HTTP ' + r.status + ': ' + r.statusText);
+            return r.json();
+          })
+          .then(function(data) {
             this.giteaTree = data.tree || [];
-            // Render tree items into the sidebar workspace section
-            var container = document.getElementById('sidebar-workspace-items');
-            if (!container) return;
+            if (!container) {
+              console.log('loadGiteaTree: #sidebar-workspace-items not found');
+              return;
+            }
             container.innerHTML = '';
             if (!this.giteaTree.length) {
               container.innerHTML = '<li class="sidebar-item empty-hint"><span class="page-icon">📄</span><span class="page-name text-dim">No files yet</span></li>';
@@ -897,8 +911,14 @@
               li.innerHTML = '<span class="page-icon">' + icon + '</span><span class="page-name">' + item.name + '</span>';
               container.appendChild(li);
             });
-          })
-          .catch(function() { /* silently ignore */ });
+            console.log('loadGiteaTree: rendered ' + this.giteaTree.length + ' items');
+          }.bind(this))
+          .catch(function(err) {
+            console.error('loadGiteaTree failed:', err.message || err);
+            if (container) {
+              container.innerHTML = '<li class="sidebar-item empty-hint"><span class="page-icon">⚠️</span><span class="page-name text-dim">Could not load tree: ' + (err.message || 'Unknown error') + '</span></li>';
+            }
+          });
       },
       newPageInWorkspace() {
         const name = prompt('File name:');