Decouple projects from rounds with RoundProject join table

Projects now exist at the program level instead of being locked to a
single round. A new RoundProject join table enables many-to-many
relationships with per-round status tracking. Rounds have sortOrder
for configurable progression paths.

- Add RoundProject model, programId on Project, sortOrder on Round
- Migration preserves existing data (roundId -> RoundProject entries)
- Update all routers to query through RoundProject join
- Add assign/remove/advance/reorder round endpoints
- Add Assign, Advance, Remove Projects dialogs on round detail page
- Add round reorder controls (up/down arrows) on rounds list
- Show all rounds on project detail page

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

src/app/(admin)/admin/rounds/[id]/live-voting/page.tsx

@@ -180,7 +180,7 @@ function LiveVotingContent({ roundId }: { roundId: string }) {
       if (storedOrder.length > 0) {
         setProjectOrder(storedOrder)
       } else {
-        setProjectOrder(sessionData.round.projects.map((p) => p.id))
+        setProjectOrder(sessionData.round.roundProjects.map((rp) => rp.project.id))
       }
     }
   }, [sessionData])
@@ -253,7 +253,7 @@ function LiveVotingContent({ roundId }: { roundId: string }) {
     )
   }
 
-  const projects = sessionData.round.projects
+  const projects = sessionData.round.roundProjects.map((rp) => rp.project)
   const sortedProjects = projectOrder
     .map((id) => projects.find((p) => p.id === id))
     .filter((p): p is Project => !!p)

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

@@ -1,6 +1,6 @@
 'use client'
 
-import { Suspense, use } from 'react'
+import { Suspense, use, useState } from 'react'
 import Link from 'next/link'
 import { useRouter } from 'next/navigation'
 import { trpc } from '@/lib/trpc/client'
@@ -44,8 +44,14 @@ import {
   Filter,
   Trash2,
   Loader2,
+  Plus,
+  ArrowRightCircle,
+  Minus,
 } from 'lucide-react'
 import { toast } from 'sonner'
+import { AssignProjectsDialog } from '@/components/admin/assign-projects-dialog'
+import { AdvanceProjectsDialog } from '@/components/admin/advance-projects-dialog'
+import { RemoveProjectsDialog } from '@/components/admin/remove-projects-dialog'
 import { format, formatDistanceToNow, isPast, isFuture } from 'date-fns'
 
 interface PageProps {
@@ -54,6 +60,9 @@ interface PageProps {
 
 function RoundDetailContent({ roundId }: { roundId: string }) {
   const router = useRouter()
+  const [assignOpen, setAssignOpen] = useState(false)
+  const [advanceOpen, setAdvanceOpen] = useState(false)
+  const [removeOpen, setRemoveOpen] = useState(false)
 
   const { data: round, isLoading } = trpc.round.get.useQuery({ id: roundId })
   const { data: progress } = trpc.round.getProgress.useQuery({ id: roundId })
@@ -235,7 +244,7 @@ function RoundDetailContent({ roundId }: { roundId: string }) {
             <FileText className="h-4 w-4 text-muted-foreground" />
           </CardHeader>
           <CardContent>
-            <div className="text-2xl font-bold">{round._count.projects}</div>
+            <div className="text-2xl font-bold">{round._count.roundProjects}</div>
             <Button variant="link" size="sm" className="px-0" asChild>
               <Link href={`/admin/projects?round=${round.id}`}>View projects</Link>
             </Button>
@@ -423,9 +432,43 @@ function RoundDetailContent({ roundId }: { roundId: string }) {
                 View Projects
               </Link>
             </Button>
+            <Button variant="outline" onClick={() => setAssignOpen(true)}>
+              <Plus className="mr-2 h-4 w-4" />
+              Assign Projects
+            </Button>
+            <Button variant="outline" onClick={() => setAdvanceOpen(true)}>
+              <ArrowRightCircle className="mr-2 h-4 w-4" />
+              Advance Projects
+            </Button>
+            <Button variant="outline" onClick={() => setRemoveOpen(true)}>
+              <Minus className="mr-2 h-4 w-4" />
+              Remove Projects
+            </Button>
           </div>
         </CardContent>
       </Card>
+
+      {/* Dialogs */}
+      <AssignProjectsDialog
+        roundId={roundId}
+        programId={round.program.id}
+        open={assignOpen}
+        onOpenChange={setAssignOpen}
+        onSuccess={() => utils.round.get.invalidate({ id: roundId })}
+      />
+      <AdvanceProjectsDialog
+        roundId={roundId}
+        programId={round.program.id}
+        open={advanceOpen}
+        onOpenChange={setAdvanceOpen}
+        onSuccess={() => utils.round.get.invalidate({ id: roundId })}
+      />
+      <RemoveProjectsDialog
+        roundId={roundId}
+        open={removeOpen}
+        onOpenChange={setRemoveOpen}
+        onSuccess={() => utils.round.get.invalidate({ id: roundId })}
+      />
     </div>
   )
 }