feat: Enhance project and reservation management

- Updated reservation list to display estimated units and improved count display.
- Added "Upcoming" status to project dashboard and header with corresponding styles.
- Implemented a dropdown for quick status updates in project header.
- Modified project list compact view to reflect new status labels.
- Updated project overview to include a tab for upcoming projects.
- Added migration script to introduce estimated_units column in job_reservations table.

backend/models.py

@@ -480,6 +480,7 @@ class JobReservation(Base):
     # For quantity reservations
     device_type = Column(String, default="seismograph")  # seismograph | slm
     quantity_needed = Column(Integer, nullable=True)  # e.g., 8 units
+    estimated_units = Column(Integer, nullable=True)
 
     # Metadata
     notes = Column(Text, nullable=True)