Fix QA findings: bound queries, error handlers, snooze clamp

C-01: Add 30-day lower bound on overdue todo/reminder queries to
prevent fetching entire history.
C-02: Remove dead include_past query param — past-event filtering
is handled client-side.
W-01: Add onError toast handlers to all three inline mutations.
W-02: Snooze dropdown opens upward (bottom-full) to avoid clipping
inside the ScrollArea overflow container.
S-06: Clamp getMinutesUntilTomorrowMorning() to max 1440 to stay
within ReminderSnooze schema bounds.

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

backend/app/routers/dashboard.py

@@ -156,26 +156,27 @@ async def get_dashboard(
 async def get_upcoming(
     days: int = Query(default=7, ge=1, le=90),
     client_date: Optional[date] = Query(None, ge=date(2020, 1, 1), le=date(2099, 12, 31)),
-    include_past: bool = Query(default=True),
     db: AsyncSession = Depends(get_db),
     current_user: User = Depends(get_current_user),
     current_settings: Settings = Depends(get_current_settings),
 ):
     """Get unified list of upcoming items (todos, events, reminders) sorted by date."""
     today = client_date or date.today()
-    now = datetime.now()
     cutoff_date = today + timedelta(days=days)
     cutoff_datetime = datetime.combine(cutoff_date, datetime.max.time())
     today_start = datetime.combine(today, datetime.min.time())
+    overdue_floor = today - timedelta(days=30)
+    overdue_floor_dt = datetime.combine(overdue_floor, datetime.min.time())
 
     # Subquery: calendar IDs belonging to this user
     user_calendar_ids = select(Calendar.id).where(Calendar.user_id == current_user.id)
 
-    # Build queries — include overdue todos and snoozed reminders
+    # Build queries — include overdue todos (up to 30 days back) and snoozed reminders
     todos_query = select(Todo).where(
         Todo.user_id == current_user.id,
         Todo.completed == False,
         Todo.due_date.isnot(None),
+        Todo.due_date >= overdue_floor,
         Todo.due_date <= cutoff_date
     )
 
@@ -190,6 +191,7 @@ async def get_upcoming(
         Reminder.user_id == current_user.id,
         Reminder.is_active == True,
         Reminder.is_dismissed == False,
+        Reminder.remind_at >= overdue_floor_dt,
         Reminder.remind_at <= cutoff_datetime
     )
 
@@ -220,11 +222,6 @@ async def get_upcoming(
 
     for event in events:
         end_dt = event.end_datetime
-        # When include_past=False, filter out past events
-        if not include_past and end_dt:
-            if end_dt < now:
-                continue
-
         upcoming_items.append({
             "type": "event",
             "id": event.id,

frontend/src/components/dashboard/UpcomingWidget.tsx

@@ -35,7 +35,7 @@ const typeConfig: Record<string, { hoverGlow: string; pillBg: string; pillText:
 function getMinutesUntilTomorrowMorning(): number {
   const now = new Date();
   const tomorrow = new Date(now.getFullYear(), now.getMonth(), now.getDate() + 1, 9, 0, 0);
-  return Math.max(1, Math.round((tomorrow.getTime() - now.getTime()) / 60000));
+  return Math.min(1440, Math.max(1, Math.round((tomorrow.getTime() - now.getTime()) / 60000)));
 }
 
 function getDayLabel(dateStr: string): string {
@@ -77,6 +77,7 @@ export default function UpcomingWidget({ items }: UpcomingWidgetProps) {
       queryClient.invalidateQueries({ queryKey: ['dashboard'] });
       toast.success('Todo completed');
     },
+    onError: () => toast.error('Failed to complete todo'),
   });
 
   // Snooze reminder
@@ -87,6 +88,7 @@ export default function UpcomingWidget({ items }: UpcomingWidgetProps) {
       queryClient.invalidateQueries({ queryKey: ['upcoming'] });
       toast.success('Reminder snoozed');
     },
+    onError: () => toast.error('Failed to snooze reminder'),
   });
 
   // Dismiss reminder
@@ -97,6 +99,7 @@ export default function UpcomingWidget({ items }: UpcomingWidgetProps) {
       queryClient.invalidateQueries({ queryKey: ['dashboard'] });
       toast.success('Reminder dismissed');
     },
+    onError: () => toast.error('Failed to dismiss reminder'),
   });
 
   // Filter and group items
@@ -325,7 +328,7 @@ export default function UpcomingWidget({ items }: UpcomingWidgetProps) {
                                       <Clock className="h-3.5 w-3.5" />
                                     </button>
                                     {snoozeOpen === itemKey && (
-                                      <div className="absolute right-0 top-full mt-1 w-28 rounded-md border bg-popover shadow-lg z-50 py-1 animate-fade-in">
+                                      <div className="absolute right-0 bottom-full mb-1 w-28 rounded-md border bg-popover shadow-lg z-50 py-1 animate-fade-in">
                                         <button
                                           onClick={(e) => handleSnooze(item.id, 60, e)}
                                           className="flex items-center w-full px-3 py-1.5 text-xs hover:bg-card-elevated transition-colors text-muted-foreground hover:text-foreground"