fix(library): tab Workspace affiche le contenu du workspace local actif

- Nouvel endpoint /api/library/local-workspace?workspace_id=X
  interroge local_workspace_items et formate pour la Library
- Nouvel endpoint /api/library/local-workspace-children/{id}
  pour l'expansion d'arborescence des items du workspace local
- Frontend: détecte workspaceId + !isGiteaActive → appelle local-workspace
- Frontend: toggleExpand route vers le bon endpoint selon source_type

app/templates/library.html

@@ -464,8 +464,14 @@ function libraryPage() {
       try {
         var url = '/api/library/' + this.tab;
         var sep = '?';
-        if (this.workspaceId && (this.tab === 'recents')) {
-          url += sep + 'workspace_id=' + this.workspaceId; sep = '&';
+        // Workspace tab: if local workspace is active, show local workspace items
+        if (this.tab === 'workspace' && this.workspaceId && !this.isGiteaActive) {
+          url = '/api/library/local-workspace' + sep + 'workspace_id=' + this.workspaceId;
+          sep = '&';
+        } else {
+          if (this.workspaceId && (this.tab === 'recents')) {
+            url += sep + 'workspace_id=' + this.workspaceId; sep = '&';
+          }
         }
         if (this.tab === 'repository' && this.isGiteaActive) {
           url += sep + 'gitea_owner=' + encodeURIComponent(this.giteaOwner) + '&gitea_repo=' + encodeURIComponent(this.giteaRepo);
@@ -522,7 +528,12 @@ function libraryPage() {
       this.expanded = Object.assign({}, this.expanded);
       if (!item.children || !item.children.length) {
         try {
-          var r = await fetch('/api/library/children/' + item.id);
+          // Route to correct children endpoint based on source type
+          var childrenUrl = '/api/library/children/' + item.id;
+          if (item.source_type === 'local-ws') {
+            childrenUrl = '/api/library/local-workspace-children/' + item.id;
+          }
+          var r = await fetch(childrenUrl);
           var d = await r.json();
           item.children = d.items || [];
           // Mark the tree for depth calculation