Revert 253c922: restore the PM/RBAC work to the integration

Reverting the production revert so the pm branch can merge cleanly on
top of the restored RBAC base. Conflicts against newer integration work
resolved by combining:
- App.tsx: v7's bot-draft wizard bypass + login returnUrl kept alongside
  the supervisor gating (no-project block screen, panel scoping)
- LoginPage: returnUrl navigation kept, supervisor routing added
- migration.sql: bot_drafts table kept, unified-projects ALTERs restored

backend/app/auth.py

@@ -119,10 +119,12 @@ async def context_from_claims(claims: dict, db: AsyncSession) -> UserContext:
     if not casdoor_id:
         raise UnauthorizedError("توکن فاقد شناسه کاربر است", field="authorization")
 
+    username = str(claims.get("name") or claims.get("preferred_username") or "")
     user = await db.scalar(select(User).where(User.casdoor_id == casdoor_id))
     if user is None:
         user = User(
             casdoor_id=casdoor_id,
+            username=username or None,
             first_name=str(
                 claims.get("firstName")
                 or claims.get("firstname")
@@ -135,9 +137,12 @@ async def context_from_claims(claims: dict, db: AsyncSession) -> UserContext:
         )
         db.add(user)
         await db.flush()
+    elif username and not user.username:
+        user.username = username
+        await db.flush()
 
     project_ids: list = []
-    if user.role == "pm":
+    if user.role in ("supervisor", "pm"):
         projects = (
             await db.execute(
                 select(Project)
@@ -159,7 +164,7 @@ async def context_from_claims(claims: dict, db: AsyncSession) -> UserContext:
 
 
 async def pm_project_ids(db: AsyncSession, user: User) -> list:
-    """Every project id managed by the given PM user (oldest first)."""
+    """Every project id managed by the given PM/supervisor user (oldest first)."""
     rows = (
         await db.execute(
             select(Project.id)