fix(server): dashboard query (#15195)

#### PR Dependency Tree


* **PR #15195** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

* **Bug Fixes**
* Admin dashboard storage history now returns a continuous day-by-day
trend, carrying forward the last known workspace and blob storage values
for days without samples.
* Active member counts for workspace analytics were corrected to reflect
active workspace members.
* **New Features**
* Admin workspace member roles are now returned via a dedicated role
enum, serialized as enum name strings (e.g., `Owner`).
* **UI Improvements**
* Renamed key labels to “Active Members” and “Members and Invitations”;
member roles use pill badges and non-accepted statuses are shown.
* **Tests**
* Added E2E coverage for role enum serialization and strengthened
storage history assertions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/schema.gql

@@ -163,10 +163,16 @@ type AdminWorkspaceMember {
   email: String!
   id: String!
   name: String!
-  role: Permission!
+  role: AdminWorkspaceMemberRole!
   status: WorkspaceMemberStatus!
 }
 
+enum AdminWorkspaceMemberRole {
+  Admin
+  Collaborator
+  Owner
+}
+
 type AdminWorkspaceSharedLink {
   docId: String!
   publishedAt: DateTime
@@ -2953,4 +2959,4 @@ type tokenType {
   refresh: String!
   sessionToken: String
   token: String!
-}
+}