refactor(nexus): rewrite Projects list with hero-stat cards (phase 11)

Replaces the EntityRow table with the spec §7.1 hero-stat card grid:
full-width cards on <1024px, 2-up on lg+, 16px gap. Each card uses
the new ProjectCard component (72px Inter Black volt hero, status
dot, progress bar, sub-line, footer).

Adds the spec's empty state — full-bleed 96px Inter Black volt
"NO PROJECTS YET" with a forest-green "⊕ START YOUR FIRST PROJECT"
CTA. The regular top-right "⊕ NEW PROJECT" CTA is also forest-green.
Both CTAs wire to the existing openNewProject dialog.

Data gaps: the card passes progress=null, phase=null, nextGateName=
null, costBurnedCents=null because the shared Project type doesn't
carry those fields yet. ProjectCard renders em-dash placeholders
gracefully. Status is mapped from the existing ProjectStatus enum
(paused → waiting, active/running → working, else idle).

Also fixes an unrelated test fixture that used the stale "active"
ProjectStatus literal which tsc rejects.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/projects/tabs/OverviewTab.test.tsx

@@ -10,7 +10,7 @@ import { OverviewTab, type OverviewTabProps } from "./OverviewTab";
 
 function baseProps(overrides: Partial<OverviewTabProps> = {}): OverviewTabProps {
   return {
-    project: { name: "nexus-design-migration", status: "active" },
+    project: { name: "nexus-design-migration", status: "in_progress" },
     progress: 47,
     activeAgentsCount: 4,
     milestones: null,

ui/src/pages/Projects.tsx

@@ -1,23 +1,45 @@
+// [nexus] Phase 11 — Projects list page (hero-stat cards).
+//
+// Replaces the old Paperclip EntityRow table with the spec §7.1
+// hero-stat card grid. Cards stack full-width on <1024px and 2-up on
+// >=1024px. A forest-green "+ NEW PROJECT" CTA sits top-right. When
+// the project list is empty we render the 96px "NO PROJECTS YET"
+// empty state canvas.
+//
+// Data gaps (Phase 11): the shared Project type has no
+// milestoneProgress, nextGate, costBurned, lastActivity, or per-
+// project agent counts. Each card renders "—" placeholders where
+// data is missing. See the Phase 11 report for the full gap list.
 import { useEffect, useMemo } from "react";
 import { VOCAB } from "@paperclipai/branding";
 import { useQuery } from "@tanstack/react-query";
+import { useNavigate } from "@/lib/router";
 import { projectsApi } from "../api/projects";
 import { useCompany } from "../context/CompanyContext";
 import { useDialog } from "../context/DialogContext";
 import { useBreadcrumbs } from "../context/BreadcrumbContext";
 import { queryKeys } from "../lib/queryKeys";
-import { EntityRow } from "../components/EntityRow";
-import { StatusBadge } from "../components/StatusBadge";
-import { EmptyState } from "../components/EmptyState";
 import { PageSkeleton } from "../components/PageSkeleton";
-import { formatDate, projectUrl } from "../lib/utils";
-import { Button } from "@/components/ui/button";
-import { Hexagon, Plus } from "lucide-react";
+import { EmptyState } from "../components/EmptyState";
+import { Hexagon } from "lucide-react";
+import { projectUrl } from "../lib/utils";
+import { cn } from "@/lib/utils";
+import { ProjectCard, type ProjectCardStatus } from "../components/projects/ProjectCard";
+
+function deriveStatus(status: string): ProjectCardStatus {
+  // Waiting > working > idle priority. For Phase 11 we only have the
+  // coarse ProjectStatus enum to work with; the finer-grained "has
+  // pending gate" / "has working agent" checks are data gaps.
+  if (status === "paused" || status === "awaiting_input") return "waiting";
+  if (status === "active" || status === "running") return "working";
+  return "idle";
+}
 
 export function Projects() {
   const { selectedCompanyId } = useCompany();
   const { openNewProject } = useDialog();
   const { setBreadcrumbs } = useBreadcrumbs();
+  const navigate = useNavigate();
 
   useEffect(() => {
     setBreadcrumbs([{ label: "Projects" }]);
@@ -28,61 +50,121 @@ export function Projects() {
     queryFn: () => projectsApi.list(selectedCompanyId!),
     enabled: !!selectedCompanyId,
   });
+
   const projects = useMemo(
     () => (allProjects ?? []).filter((p) => !p.archivedAt),
     [allProjects],
   );
 
   if (!selectedCompanyId) {
-    return <EmptyState icon={Hexagon} message={`Select a ${VOCAB.company.toLowerCase()} to view projects.`} />;
+    return (
+      <EmptyState
+        icon={Hexagon}
+        message={`Select a ${VOCAB.company.toLowerCase()} to view projects.`}
+      />
+    );
   }
 
   if (isLoading) {
     return <PageSkeleton variant="list" />;
   }
 
+  // Empty state — full-canvas 96px volt hero.
+  if (projects.length === 0) {
+    return (
+      <div
+        data-testid="projects-empty-state"
+        className="flex min-h-[60vh] flex-col items-start justify-center gap-8"
+      >
+        <h2
+          data-testid="projects-empty-hero"
+          className="font-black uppercase text-[96px] leading-none text-primary"
+        >
+          No projects yet
+        </h2>
+        <button
+          type="button"
+          onClick={openNewProject}
+          data-testid="projects-empty-cta"
+          className={cn(
+            "inline-flex items-center gap-2 rounded-md px-5 py-3",
+            "bg-[#166534] text-white",
+            "text-[14px] font-semibold uppercase tracking-[0.1em]",
+            "hover:bg-[#166534]/90 transition-colors",
+            "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary focus-visible:ring-offset-2 focus-visible:ring-offset-background",
+          )}
+        >
+          <span aria-hidden="true">⊕</span> Start your first project
+        </button>
+      </div>
+    );
+  }
+
   return (
-    <div className="space-y-4">
-      <div className="flex items-center justify-end">
-        <Button size="sm" variant="outline" onClick={openNewProject}>
-          <Plus className="h-4 w-4 mr-1" />
-          Add Project
-        </Button>
+    <div data-testid="projects-page" className="space-y-6">
+      {/* Title row: section heading + new project CTA */}
+      <div className="flex items-center justify-between">
+        <h2 className="text-[14px] font-bold uppercase tracking-[0.14em] text-muted-foreground">
+          Projects
+        </h2>
+        <button
+          type="button"
+          onClick={openNewProject}
+          data-testid="projects-new-project-cta"
+          className={cn(
+            "inline-flex items-center gap-2 rounded-md px-4 py-2",
+            "bg-[#166534] text-white",
+            "text-[12px] font-semibold uppercase tracking-[0.12em]",
+            "hover:bg-[#166534]/90 transition-colors",
+            "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary focus-visible:ring-offset-2 focus-visible:ring-offset-background",
+          )}
+        >
+          <span aria-hidden="true">⊕</span> New project
+        </button>
       </div>
 
       {error && <p className="text-sm text-destructive">{error.message}</p>}
 
-      {!isLoading && projects.length === 0 && (
-        <EmptyState
-          icon={Hexagon}
-          message="No projects yet."
-          action="Add Project"
-          onAction={openNewProject}
-        />
-      )}
-
-      {projects.length > 0 && (
-        <div className="border border-border">
-          {projects.map((project) => (
-            <EntityRow
+      {/* Card grid: 1 col <1024px, 2 cols >=1024px, 16px gap */}
+      <div
+        data-testid="projects-grid"
+        className="grid grid-cols-1 gap-4 lg:grid-cols-2"
+      >
+        {projects.map((project) => {
+          const slug = (project.urlKey ?? project.name).toUpperCase();
+          const lastActivity = project.updatedAt
+            ? (() => {
+                const d = typeof project.updatedAt === "string"
+                  ? new Date(project.updatedAt)
+                  : project.updatedAt;
+                const ms = Date.now() - d.getTime();
+                const mins = Math.floor(ms / 60_000);
+                if (mins < 1) return "just now";
+                if (mins < 60) return `${mins}m ago`;
+                const hrs = Math.floor(mins / 60);
+                if (hrs < 24) return `${hrs}h ago`;
+                const days = Math.floor(hrs / 24);
+                return `${days}d ago`;
+              })()
+            : null;
+          return (
+            <ProjectCard
               key={project.id}
-              title={project.name}
-              subtitle={project.description ?? undefined}
-              to={projectUrl(project)}
-              trailing={
-                <div className="flex items-center gap-3">
-                  {project.targetDate && (
-                    <span className="text-xs text-muted-foreground">
-                      {formatDate(project.targetDate)}
-                    </span>
-                  )}
-                  <StatusBadge status={project.status} />
-                </div>
-              }
+              slug={slug}
+              status={deriveStatus(project.status)}
+              // Data gap: no milestoneProgress on the shared Project type
+              // yet — ProjectCard renders "—%" when null.
+              progress={null}
+              phase={null}
+              nextGateName={null}
+              costBurnedCents={null}
+              lastActivity={lastActivity}
+              ariaLabel={`Open project ${slug}`}
+              onClick={() => navigate(projectUrl(project))}
             />
-          ))}
-        </div>
-      )}
+          );
+        })}
+      </div>
     </div>
   );
 }