fix: Gitea sidebar now has separate Repository section below Private

Backend:
- _sidebar_data() no longer clears workspace_pages for Gitea workspaces
  The local tree stays intact in the 'Private' section
- workspace_pages is always loaded from DB (local files)

Sidebar template (base.html):
- Workspace section renamed to 'Private' when gitea_workspace is true
- New 'Repository (Gitea)' section added below, visible only for Gitea
  workspaces, with its own toggle (sectionsOpen.gitea) and refresh button
- Uses #sidebar-gitea-items container for the remote file tree

Gitea workspace:
- loadSidebarTree() now targets #sidebar-gitea-items
- window._gwData exposed for sidebar refresh button
- sectionsOpen now includes gitea: true by default

app/templates/gitea_workspace.html

@@ -229,9 +229,11 @@ function giteaWorkspace() {
     },
 
     init() {
+      // Expose globally for header to access
+      window._gwData = this;
       // Set cookie for sidebar
       document.cookie = 'flowdeck_workspace=gitea:' + this.owner + ':' + this.repo + ';path=/;SameSite=Lax';
-      // Load sidebar tree
+      // Load sidebar tree (into gitea section)
       this.loadSidebarTree();
       // Load main content tree
       this.loadMainTree('');
@@ -312,17 +314,17 @@ function giteaWorkspace() {
         var r = await fetch('/api/gitea/projects/' + this.owner + '/' + this.repo + '/tree');
         if (!r.ok) {
           // If API fails (e.g. no Gitea token), set a message
-          var container = document.getElementById('sidebar-workspace-items');
+          var container = document.getElementById('sidebar-gitea-items');
           if (container) container.innerHTML = '<li class="sidebar-item empty-hint"><span class="page-icon">🔗</span><span class="page-name text-dim">Connect Gitea to browse files</span></li>';
           return;
         }
         var d = await r.json();
         var items = d.tree || [];
-        var container = document.getElementById('sidebar-workspace-items');
+        var container = document.getElementById('sidebar-gitea-items');
         if (!container) return;
-        // Ensure workspace section is visible
-        if (window.appState && window.appState.sectionsOpen && !window.appState.sectionsOpen.workspace) {
-          window.appState.sectionsOpen.workspace = true;
+        // Ensure gitea section is visible
+        if (window.appState && window.appState.sectionsOpen && !window.appState.sectionsOpen.gitea) {
+          window.appState.sectionsOpen.gitea = true;
         }
         container.innerHTML = '';
         // Build tree HTML as string and set once (more performant)