fix: assign project to round on creation (create ProjectRoundState)

- Add optional roundId field to project.create mutation input schema
- After project creation, update project.roundId FK and create a
  ProjectRoundState record (state: PENDING) when roundId is supplied
- Pass selectedRoundId from the new-project form to createProject.mutate()

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

src/server/routers/project.ts

@@ -484,6 +484,7 @@ export const projectRouter = router({
     .input(
       z.object({
         programId: z.string(),
+        roundId: z.string().optional(),
         title: z.string().min(1).max(500),
         teamName: z.string().optional(),
         description: z.string().optional(),
@@ -553,6 +554,20 @@ export const projectRouter = router({
           },
         })
 
+        if (input.roundId) {
+          await tx.project.update({
+            where: { id: created.id },
+            data: { roundId: input.roundId },
+          })
+          await tx.projectRoundState.create({
+            data: {
+              projectId: created.id,
+              roundId: input.roundId,
+              state: 'PENDING',
+            },
+          })
+        }
+
         // Create team members if provided
         const inviteList: { userId: string; email: string; name: string }[] = []
         if (teamMembersInput && teamMembersInput.length > 0) {