Add background filtering jobs, improved date picker, AI reasoning display

- Implement background job system for AI filtering to avoid HTTP timeouts
- Add FilteringJob model to track progress of long-running filtering operations
- Add real-time progress polling for filtering operations on round details page
- Create custom DateTimePicker component with calendar popup (no year picker hassle)
- Fix round date persistence bug (refetchOnWindowFocus was resetting form state)
- Integrate filtering controls into round details page for filtering rounds
- Display AI reasoning for flagged/filtered projects in results table
- Add onboarding system scaffolding (schema, routes, basic UI)
- Allow setting round dates in the past for manual overrides

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

src/app/(admin)/admin/rounds/new/page.tsx

@@ -35,16 +35,17 @@ import {
 } from '@/components/ui/form'
 import { RoundTypeSettings } from '@/components/forms/round-type-settings'
 import { ArrowLeft, Loader2, AlertCircle } from 'lucide-react'
+import { DateTimePicker } from '@/components/ui/datetime-picker'
 
 const createRoundSchema = z.object({
   programId: z.string().min(1, 'Please select a program'),
   name: z.string().min(1, 'Name is required').max(255),
   requiredReviews: z.number().int().min(1).max(10),
-  votingStartAt: z.string().optional(),
-  votingEndAt: z.string().optional(),
+  votingStartAt: z.date().nullable().optional(),
+  votingEndAt: z.date().nullable().optional(),
 }).refine((data) => {
   if (data.votingStartAt && data.votingEndAt) {
-    return new Date(data.votingEndAt) > new Date(data.votingStartAt)
+    return data.votingEndAt > data.votingStartAt
   }
   return true
 }, {
@@ -75,8 +76,8 @@ function CreateRoundContent() {
       programId: programIdParam || '',
       name: '',
       requiredReviews: 3,
-      votingStartAt: '',
-      votingEndAt: '',
+      votingStartAt: null,
+      votingEndAt: null,
     },
   })
 
@@ -87,8 +88,8 @@ function CreateRoundContent() {
       roundType,
       requiredReviews: data.requiredReviews,
       settingsJson: roundSettings,
-      votingStartAt: data.votingStartAt ? new Date(data.votingStartAt) : undefined,
-      votingEndAt: data.votingEndAt ? new Date(data.votingEndAt) : undefined,
+      votingStartAt: data.votingStartAt ?? undefined,
+      votingEndAt: data.votingEndAt ?? undefined,
     })
   }
 
@@ -246,7 +247,11 @@ function CreateRoundContent() {
                     <FormItem>
                       <FormLabel>Start Date & Time</FormLabel>
                       <FormControl>
-                        <Input type="datetime-local" {...field} />
+                        <DateTimePicker
+                          value={field.value}
+                          onChange={field.onChange}
+                          placeholder="Select start date & time"
+                        />
                       </FormControl>
                       <FormMessage />
                     </FormItem>
@@ -260,7 +265,11 @@ function CreateRoundContent() {
                     <FormItem>
                       <FormLabel>End Date & Time</FormLabel>
                       <FormControl>
-                        <Input type="datetime-local" {...field} />
+                        <DateTimePicker
+                          value={field.value}
+                          onChange={field.onChange}
+                          placeholder="Select end date & time"
+                        />
                       </FormControl>
                       <FormMessage />
                     </FormItem>
@@ -269,8 +278,7 @@ function CreateRoundContent() {
               </div>
 
               <p className="text-sm text-muted-foreground">
-                Leave empty to set the voting window later. The round will need to be
-                activated before jury members can submit evaluations.
+                Leave empty to set the voting window later. Past dates are allowed.
               </p>
             </CardContent>
           </Card>