fix(core): shared mode permission check (#13087)

close CLOUD-191

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved permission handling for shared mode workspaces to prevent
unnecessary permission checks.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/modules/permissions/services/guard.ts

@@ -168,6 +168,9 @@ export class GuardService extends Service {
     if (this.workspaceService.workspace.flavour === 'local') {
       return {} as Record<WorkspacePermissionActions, boolean>;
     }
+    if (this.workspaceService.workspace.openOptions.isSharedMode) {
+      return {};
+    }
     const permissions = await this.guardStore.getWorkspacePermissions();
     this.workspacePermissions$.next(permissions);
     return permissions;
@@ -177,6 +180,9 @@ export class GuardService extends Service {
     if (this.workspaceService.workspace.flavour === 'local') {
       return {} as Record<DocPermissionActions, boolean>;
     }
+    if (this.workspaceService.workspace.openOptions.isSharedMode) {
+      return {};
+    }
     const permissions = await this.guardStore.getDocPermissions(docId);
     this.docPermissions$.next({
       ...this.docPermissions$.value,