Make remaining date inputs Safari-safe (uncontrolled)

Attendance filter, gradebook assignment date, and tuition entry date now use
defaultValue (with a remount key where the field resets after submit).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/gradebook.tsx

@@ -221,6 +221,7 @@ export function GradebookGrid({ classId, canEdit }: { classId: string; canEdit:
   });
 
   const [na, setNa] = useState({ name: "", category_id: "", max_points: "100", date: "" });
+  const [dateKey, setDateKey] = useState(0); // bump to remount the uncontrolled date input after adding
   const addAssignment = useMutation({
     mutationFn: async () => {
       if (!na.name.trim()) throw new Error("Assignment name required");
@@ -231,7 +232,7 @@ export function GradebookGrid({ classId, canEdit }: { classId: string; canEdit:
       });
       if (error) throw error;
     },
-    onSuccess: () => { setNa({ name: "", category_id: "", max_points: "100", date: "" }); qc.invalidateQueries({ queryKey: ["assignments", classId] }); toast.success("Assignment added"); },
+    onSuccess: () => { setNa({ name: "", category_id: "", max_points: "100", date: "" }); setDateKey((k) => k + 1); qc.invalidateQueries({ queryKey: ["assignments", classId] }); toast.success("Assignment added"); },
     onError: (e: Error) => toast.error(e.message),
   });
   const delAssignment = useMutation({
@@ -253,7 +254,7 @@ export function GradebookGrid({ classId, canEdit }: { classId: string; canEdit:
               <SelectContent>{cfg.categories.map((c) => <SelectItem key={c.id} value={c.id}>{c.name}</SelectItem>)}</SelectContent>
             </Select>
             <Input type="number" placeholder="Max pts" value={na.max_points} onChange={(e) => setNa({ ...na, max_points: e.target.value })} />
-            <Input type="date" value={na.date} onChange={(e) => setNa({ ...na, date: e.target.value })} />
+            <Input key={dateKey} type="date" defaultValue={na.date} onChange={(e) => setNa({ ...na, date: e.target.value })} />
             <Button onClick={() => addAssignment.mutate()} disabled={addAssignment.isPending}><Plus className="h-4 w-4 mr-1" /> Add</Button>
           </div>
         </div>