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/components/observer/observer-projects-content.tsx

@@ -274,6 +274,36 @@ export function ObserverProjectsContent() {
         </Card>
       ) : projectsData && projectsData.projects.length > 0 ? (
         <>
+          {/* Top Pagination */}
+          {projectsData.totalPages > 1 && (
+            <div className="flex items-center justify-between">
+              <p className="text-sm text-muted-foreground">
+                Page {projectsData.page} of {projectsData.totalPages} &middot;{' '}
+                {projectsData.total} result{projectsData.total !== 1 ? 's' : ''}
+              </p>
+              <div className="flex items-center gap-2">
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={() => setPage((p) => Math.max(1, p - 1))}
+                  disabled={page <= 1}
+                >
+                  <ChevronLeft className="h-4 w-4" />
+                </Button>
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={() =>
+                    setPage((p) => Math.min(projectsData.totalPages, p + 1))
+                  }
+                  disabled={page >= projectsData.totalPages}
+                >
+                  <ChevronRight className="h-4 w-4" />
+                </Button>
+              </div>
+            </div>
+          )}
+
           <div className="hidden md:block">
             <Card>
               <CardContent className="p-0">