feat: fix project status counts, add top pagination and sortable columns

- Status counts now show each project's latest round state only
  (no more inflated counts from projects passing multiple rounds)
- Add pagination controls at top of projects, members, and observer lists
- Add sortable column headers to admin projects table (title, category,
  program, assignments, status) and members table (name, role, status,
  last login)
- Backend: add sortBy/sortDir params to project.list and user.list

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

src/server/routers/user.ts

@@ -238,10 +238,12 @@ export const userRouter = router({
         search: z.string().optional(),
         page: z.number().int().min(1).default(1),
         perPage: z.number().int().min(1).max(100).default(20),
+        sortBy: z.enum(['name', 'email', 'role', 'status', 'lastLoginAt', 'createdAt']).optional(),
+        sortDir: z.enum(['asc', 'desc']).optional(),
       })
     )
     .query(async ({ ctx, input }) => {
-      const { role, roles, status, search, page, perPage } = input
+      const { role, roles, status, search, page, perPage, sortBy, sortDir } = input
       const skip = (page - 1) * perPage
 
       const where: Record<string, unknown> = {}
@@ -259,12 +261,17 @@ export const userRouter = router({
         ]
       }
 
+      const dir = sortDir ?? 'asc'
+      const orderBy: Record<string, string> = sortBy
+        ? { [sortBy]: dir }
+        : { createdAt: 'desc' }
+
       const [users, total] = await Promise.all([
         ctx.prisma.user.findMany({
           where,
           skip,
           take: perPage,
-          orderBy: { createdAt: 'desc' },
+          orderBy,
           select: {
             id: true,
             email: true,