feat: Gitea file tree visible in sidebar on ALL pages

- base.html Alpine: added giteaWorkspace, giteaOwner, giteaRepo data
- loadGiteaTree() fetches /api/gitea/.../tree and renders in sidebar
- board._sidebar_data returns gitea_owner/gitea_repo
- dashboard._sidebar_data returns gitea_owner/gitea_repo
- alpine:initialized triggers loadGiteaTree on every page load

app/templates/base.html

@@ -577,6 +577,10 @@
       lastEdited: '{{ last_edited }}',
       workspaceKey: '{{ workspace_key }}',
       localWsId: {{ local_ws_id|default(0) }},
+      giteaWorkspace: {{ 'true' if gitea_workspace else 'false' }},
+      giteaOwner: '{{ gitea_owner|default("") }}',
+      giteaRepo: '{{ gitea_repo|default("") }}',
+      giteaTree: [],  // loaded client-side for sidebar
       currentView: 'home',
       contextMenu: { visible: false, x: 0, y: 0, pageId: null, pageName: '' },
       contextActions: {},
@@ -872,6 +876,30 @@
           .then(data => { window.location.href = `/pages/${data.id}`; })
           .catch(err => { this.toast('Failed to create sub-page: ' + err.message, 'error'); });
       },
+      loadGiteaTree() {
+        if (!this.giteaWorkspace || !this.giteaOwner || !this.giteaRepo) return;
+        fetch('/api/gitea/projects/' + this.giteaOwner + '/' + this.giteaRepo + '/tree')
+          .then(r => r.json())
+          .then(data => {
+            this.giteaTree = data.tree || [];
+            // Render tree items into the sidebar workspace section
+            var container = document.getElementById('sidebar-workspace-items');
+            if (!container) return;
+            container.innerHTML = '';
+            if (!this.giteaTree.length) {
+              container.innerHTML = '<li class="sidebar-item empty-hint"><span class="page-icon">📄</span><span class="page-name text-dim">No files yet</span></li>';
+              return;
+            }
+            this.giteaTree.forEach(function(item) {
+              var li = document.createElement('li');
+              li.className = 'sidebar-item';
+              var icon = item.type === 'dir' ? '📁' : '📄';
+              li.innerHTML = '<span class="page-icon">' + icon + '</span><span class="page-name">' + item.name + '</span>';
+              container.appendChild(li);
+            });
+          })
+          .catch(function() { /* silently ignore */ });
+      },
       newPageInWorkspace() {
         const name = prompt('File name:');
         if (!name || !name.trim()) return;
@@ -1082,6 +1110,14 @@
     setTimeout(function() {
       var active = document.querySelector('.sidebar-item.active');
       if (active) active.scrollIntoView({ block: 'nearest', behavior: 'smooth' });
+      // Load Gitea tree in sidebar if workspace is remote
+      var root = document.querySelector('[x-data]');
+      if (root && root.__x) {
+        var state = root.__x.$data;
+        if (state && typeof state.loadGiteaTree === 'function') {
+          state.loadGiteaTree();
+        }
+      }
     }, 300);
   });