Update beamtime assignment logic for pucks and samples

Simplified and unified beamtime assignment handling for pucks and samples in the backend. Enhanced the frontend to display detailed assignment state, including shift, date, and beamline, for both pucks and dewars. This ensures consistent and accurate state management across the application.

backend/app/routers/dewar.py

@@ -595,14 +595,23 @@ async def assign_beamtime_to_dewar(
     db: Session = Depends(get_db),
 ):
     dewar = db.query(DewarModel).filter(DewarModel.id == dewar_id).first()
-    if not dewar:  # <- Move check earlier!
+    if not dewar:
         raise HTTPException(status_code=404, detail="Dewar not found")
-    if beamtime_id == 0:
-        dewar.beamtime_id = None
-    else:
-        dewar.beamtime_id = beamtime_id
+
+    dewar.beamtime_id = None if beamtime_id == 0 else beamtime_id
     db.commit()
     db.refresh(dewar)
+    for puck in dewar.pucks:
+        puck.beamtime_id = None if beamtime_id == 0 else beamtime_id
+        for sample in puck.samples:
+            has_sample_event = (
+                db.query(SampleEvent).filter(SampleEvent.sample_id == sample.id).count()
+                > 0
+            )
+            if not has_sample_event:
+                sample.beamtime_id = None if beamtime_id == 0 else beamtime_id
+
+    db.commit()
     return {"status": "success", "dewar_id": dewar.id, "beamtime_id": beamtime_id}