Add mount_count and unmount_count tracking for samples

Introduced `mount_count` and `unmount_count` fields to track mounting events for samples. Updated models, schemas, and front-end components to support dynamic calculation and display of these counts. Enhanced backend queries and API responses to include the new data.

backend/app/models.py

@@ -151,6 +151,16 @@ class Sample(Base):
     puck = relationship("Puck", back_populates="samples")
     events = relationship("SampleEvent", back_populates="sample")
 
+    @property
+    def mount_count(self) -> int:
+        # Dynamically calculate mount_count
+        return len([event for event in self.events if event.event_type == "Mounted"])
+
+    @property
+    def unmount_count(self) -> int:
+        # Dynamically calculate unmount_count
+        return len([event for event in self.events if event.event_type == "Unmounted"])
+
 
 class Slot(Base):
     __tablename__ = "slots"