Add special awards management features and fix voting/assignment issues

Special Awards:
- Add delete button with confirmation dialog to award detail page
- Add voting window dates (start/end) to award edit page
- Add manual project eligibility management (add/remove projects)
- Show eligibility method (Auto/Manual) in eligibility table
- Auto-set votingStartAt when opening voting if date is in future

Assignment Suggestions:
- Replace toggle with proper tabs UI (Algorithm vs AI Powered)
- Persist AI suggestions when navigating away (stored in database)
- Show suggestion counts on tab badges
- Independent refresh/start buttons per tab

Round Voting:
- Auto-update votingStartAt to now when activating round if date is in future
- Fixes issue where round was opened but voting dates were in future

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(admin)/admin/awards/[id]/edit/page.tsx

@@ -44,6 +44,16 @@ export default function EditAwardPage({
   const [scoringMode, setScoringMode] = useState<'PICK_WINNER' | 'RANKED' | 'SCORED'>('PICK_WINNER')
   const [useAiEligibility, setUseAiEligibility] = useState(true)
   const [maxRankedPicks, setMaxRankedPicks] = useState('3')
+  const [votingStartAt, setVotingStartAt] = useState('')
+  const [votingEndAt, setVotingEndAt] = useState('')
+
+  // Helper to format date for datetime-local input
+  const formatDateForInput = (date: Date | string | null | undefined): string => {
+    if (!date) return ''
+    const d = new Date(date)
+    // Format: YYYY-MM-DDTHH:mm
+    return d.toISOString().slice(0, 16)
+  }
 
   // Load existing values when award data arrives
   useEffect(() => {
@@ -54,6 +64,8 @@ export default function EditAwardPage({
       setScoringMode(award.scoringMode as 'PICK_WINNER' | 'RANKED' | 'SCORED')
       setUseAiEligibility(award.useAiEligibility)
       setMaxRankedPicks(String(award.maxRankedPicks || 3))
+      setVotingStartAt(formatDateForInput(award.votingStartAt))
+      setVotingEndAt(formatDateForInput(award.votingEndAt))
     }
   }, [award])
 
@@ -68,6 +80,8 @@ export default function EditAwardPage({
         useAiEligibility,
         scoringMode,
         maxRankedPicks: scoringMode === 'RANKED' ? parseInt(maxRankedPicks) : undefined,
+        votingStartAt: votingStartAt ? new Date(votingStartAt) : undefined,
+        votingEndAt: votingEndAt ? new Date(votingEndAt) : undefined,
       })
       toast.success('Award updated')
       router.push(`/admin/awards/${awardId}`)
@@ -211,6 +225,45 @@ export default function EditAwardPage({
         </CardContent>
       </Card>
 
+      {/* Voting Window Card */}
+      <Card>
+        <CardHeader>
+          <CardTitle>Voting Window</CardTitle>
+          <CardDescription>
+            Set the time period during which jurors can submit their votes
+          </CardDescription>
+        </CardHeader>
+        <CardContent className="space-y-4">
+          <div className="grid gap-4 sm:grid-cols-2">
+            <div className="space-y-2">
+              <Label htmlFor="votingStart">Voting Opens</Label>
+              <Input
+                id="votingStart"
+                type="datetime-local"
+                value={votingStartAt}
+                onChange={(e) => setVotingStartAt(e.target.value)}
+              />
+              <p className="text-xs text-muted-foreground">
+                When jurors can start voting (leave empty to set when opening voting)
+              </p>
+            </div>
+
+            <div className="space-y-2">
+              <Label htmlFor="votingEnd">Voting Closes</Label>
+              <Input
+                id="votingEnd"
+                type="datetime-local"
+                value={votingEndAt}
+                onChange={(e) => setVotingEndAt(e.target.value)}
+              />
+              <p className="text-xs text-muted-foreground">
+                Deadline for juror votes
+              </p>
+            </div>
+          </div>
+        </CardContent>
+      </Card>
+
       <div className="flex justify-end gap-4">
         <Button variant="outline" asChild>
           <Link href={`/admin/awards/${awardId}`}>Cancel</Link>