Sort schedule blocks by start time instead of order_index

Backend queries and model relationship now order by time_start.
Frontend also sorts blocks client-side for reliability across all views.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/models/schedule.py

@@ -20,7 +20,7 @@ class ScheduleTemplate(TimestampMixin, Base):
     user: Mapped["User"] = relationship("User", back_populates="schedule_templates")  # noqa: F821
     child: Mapped["Child | None"] = relationship("Child")  # noqa: F821
     blocks: Mapped[list["ScheduleBlock"]] = relationship(
-        "ScheduleBlock", back_populates="template", cascade="all, delete-orphan", order_by="ScheduleBlock.order_index"
+        "ScheduleBlock", back_populates="template", cascade="all, delete-orphan", order_by="ScheduleBlock.time_start"
     )
     daily_sessions: Mapped[list["DailySession"]] = relationship(  # noqa: F821
         "DailySession", back_populates="template"

backend/app/routers/dashboard.py

@@ -50,7 +50,7 @@ async def get_dashboard(child_id: int, db: AsyncSession = Depends(get_db)):
             select(ScheduleBlock)
             .where(ScheduleBlock.template_id == session.template_id)
             .options(selectinload(ScheduleBlock.subject).selectinload(Subject.options))
-            .order_by(ScheduleBlock.order_index)
+            .order_by(ScheduleBlock.time_start)
         )
         blocks = blocks_result.scalars().all()
 

backend/app/routers/sessions.py

@@ -28,7 +28,7 @@ async def _broadcast_session(db: AsyncSession, session: DailySession) -> None:
             select(ScheduleBlock)
             .where(ScheduleBlock.template_id == session.template_id)
             .options(selectinload(ScheduleBlock.subject).selectinload(Subject.options))
-            .order_by(ScheduleBlock.order_index)
+            .order_by(ScheduleBlock.time_start)
         )
         blocks = [
             {