feat(mobile): add mobile summary view for 320-428px viewports (Sprint 4c)

Read-only capacity snapshot with utilization donut, top 5 active projects,
open demand alert banner, and quick-link grid — single-column card layout
optimised for PWA standalone mode.

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

apps/web/src/app/(app)/mobile/page.tsx

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+import { MobileSummaryClient } from "~/components/mobile/MobileSummaryClient.js";
+
+export const metadata = {
+  title: "CapaKraken — Mobile Summary",
+};
+
+export default function MobilePage() {
+  return <MobileSummaryClient />;
+}

apps/web/src/components/mobile/MobileCapacityCard.tsx

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+"use client";
+
+interface MobileCapacityCardProps {
+  totalResources: number;
+  activeResources: number;
+  avgUtilizationPct: number;
+  overbookedCount?: number;
+}
+
+export function MobileCapacityCard({
+  totalResources,
+  activeResources,
+  avgUtilizationPct,
+  overbookedCount = 0,
+}: MobileCapacityCardProps) {
+  const pct = Math.min(100, Math.max(0, avgUtilizationPct));
+  const circumference = 2 * Math.PI * 34; // radius = 34
+  const dashOffset = circumference * (1 - pct / 100);
+  const color =
+    pct >= 90 ? "#d97706" : pct >= 70 ? "#059669" : "#6b7280";
+
+  return (
+    <div className="rounded-2xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-900 p-5">
+      <div className="text-xs font-semibold uppercase tracking-wider text-gray-500 dark:text-gray-400 mb-4">
+        Team Capacity
+      </div>
+      <div className="flex items-center gap-5">
+        {/* CSS-only donut */}
+        <svg width="80" height="80" viewBox="0 0 80 80" className="shrink-0">
+          <circle cx="40" cy="40" r="34" fill="none" stroke="#e5e7eb" strokeWidth="8" className="dark:stroke-gray-700" />
+          <circle
+            cx="40"
+            cy="40"
+            r="34"
+            fill="none"
+            stroke={color}
+            strokeWidth="8"
+            strokeDasharray={circumference}
+            strokeDashoffset={dashOffset}
+            strokeLinecap="round"
+            transform="rotate(-90 40 40)"
+          />
+          <text x="40" y="40" textAnchor="middle" dominantBaseline="middle" fontSize="15" fontWeight="700" fill={color}>
+            {Math.round(pct)}%
+          </text>
+        </svg>
+        <div className="space-y-2 flex-1">
+          <div className="flex items-center justify-between text-sm">
+            <span className="text-gray-500 dark:text-gray-400">Resources</span>
+            <span className="font-semibold text-gray-900 dark:text-gray-100">
+              {activeResources} / {totalResources}
+            </span>
+          </div>
+          {overbookedCount > 0 && (
+            <div className="flex items-center justify-between text-sm">
+              <span className="text-amber-600 dark:text-amber-400">Overbooked</span>
+              <span className="font-semibold text-amber-600 dark:text-amber-400">{overbookedCount}</span>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}

apps/web/src/components/mobile/MobileProjectCard.tsx

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+"use client";
+
+import Link from "next/link";
+
+const STATUS_BADGE: Record<string, string> = {
+  ACTIVE:    "bg-emerald-100 text-emerald-800 dark:bg-emerald-900/40 dark:text-emerald-300",
+  DRAFT:     "bg-gray-100 text-gray-600 dark:bg-gray-800 dark:text-gray-400",
+  ON_HOLD:   "bg-amber-100 text-amber-800 dark:bg-amber-900/40 dark:text-amber-300",
+  COMPLETED: "bg-blue-100 text-blue-800 dark:bg-blue-900/40 dark:text-blue-300",
+  CANCELLED: "bg-red-100 text-red-700 dark:bg-red-900/40 dark:text-red-300",
+};
+
+interface MobileProjectCardProps {
+  id: string;
+  shortCode: string;
+  name: string;
+  status: string;
+  allocationsCount?: number;
+}
+
+export function MobileProjectCard({ id, shortCode, name, status, allocationsCount }: MobileProjectCardProps) {
+  return (
+    <Link
+      href={`/projects/${id}`}
+      className="flex items-center gap-3 rounded-xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-900 px-4 py-3 hover:bg-gray-50 dark:hover:bg-gray-800 transition-colors"
+    >
+      <div className="font-mono text-xs text-gray-500 dark:text-gray-400 w-16 shrink-0">{shortCode}</div>
+      <div className="flex-1 min-w-0">
+        <div className="text-sm font-medium text-gray-900 dark:text-gray-100 truncate">{name}</div>
+        {allocationsCount !== undefined && (
+          <div className="text-xs text-gray-500 dark:text-gray-400">{allocationsCount} allocation{allocationsCount !== 1 ? "s" : ""}</div>
+        )}
+      </div>
+      <span className={`shrink-0 rounded-full px-2 py-0.5 text-[11px] font-medium ${STATUS_BADGE[status] ?? STATUS_BADGE["DRAFT"]}`}>
+        {status.charAt(0) + status.slice(1).toLowerCase().replace("_", " ")}
+      </span>
+    </Link>
+  );
+}

apps/web/src/components/mobile/MobileSummaryClient.tsx

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+"use client";
+
+import Link from "next/link";
+import type { Route } from "next";
+import { trpc } from "~/lib/trpc/client.js";
+import { MobileCapacityCard } from "./MobileCapacityCard.js";
+import { MobileProjectCard } from "./MobileProjectCard.js";
+import { EmptyState } from "~/components/ui/EmptyState.js";
+
+export function MobileSummaryClient() {
+  const { data: overview, isLoading: overviewLoading } = trpc.dashboard.getOverview.useQuery(undefined, {
+    staleTime: 60_000,
+  });
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const { data: projectsData, isLoading: projectsLoading } = (trpc.project.list.useQuery as any)(
+    { limit: 5, status: "ACTIVE" },
+    { staleTime: 60_000 },
+  ) as { data: { projects: Array<{ id: string; shortCode: string; name: string; status: string }> } | undefined; isLoading: boolean };
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const { data: demandData } = (trpc.dashboard.getDemand.useQuery as any)(
+    undefined,
+    { staleTime: 60_000 },
+  ) as { data: { openDemandCount?: number; openDemands?: unknown[] } | undefined };
+
+  const projects = projectsData?.projects ?? [];
+  const openDemandCount = demandData?.openDemandCount ?? demandData?.openDemands?.length ?? 0;
+
+  const isLoading = overviewLoading || projectsLoading;
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-950">
+      {/* Top nav bar */}
+      <div className="sticky top-0 z-10 bg-white dark:bg-gray-900 border-b border-gray-200 dark:border-gray-800 px-4 py-3 flex items-center justify-between">
+        <h1 className="text-base font-semibold text-gray-900 dark:text-gray-100">CapaKraken</h1>
+        <Link href="/dashboard" className="text-xs font-medium text-brand-600 dark:text-brand-400">
+          Full Dashboard →
+        </Link>
+      </div>
+
+      <div className="max-w-[428px] mx-auto px-4 py-5 space-y-4">
+        {isLoading ? (
+          <div className="space-y-4">
+            {Array.from({ length: 3 }).map((_, i) => (
+              <div key={i} className="h-32 shimmer-skeleton rounded-2xl" />
+            ))}
+          </div>
+        ) : (
+          <>
+            {/* Capacity snapshot */}
+            {overview && (
+              <MobileCapacityCard
+                totalResources={overview.totalResources}
+                activeResources={overview.activeResources}
+                avgUtilizationPct={overview.budgetSummary?.avgUtilizationPercent ?? 0}
+              />
+            )}
+
+            {/* Open demand alert */}
+            {openDemandCount > 0 && (
+              <Link
+                href="/timeline"
+                className="flex items-center gap-3 rounded-xl border border-amber-300 dark:border-amber-700 bg-amber-50 dark:bg-amber-950/30 px-4 py-3"
+              >
+                <div className="h-8 w-8 shrink-0 rounded-full bg-amber-100 dark:bg-amber-900/50 flex items-center justify-center">
+                  <span className="text-sm font-bold text-amber-700 dark:text-amber-300">{openDemandCount}</span>
+                </div>
+                <div>
+                  <div className="text-sm font-semibold text-amber-800 dark:text-amber-300">
+                    Open Demand
+                  </div>
+                  <div className="text-xs text-amber-700 dark:text-amber-400">
+                    {openDemandCount} unfilled role{openDemandCount !== 1 ? "s" : ""} — tap to fill
+                  </div>
+                </div>
+              </Link>
+            )}
+
+            {/* Active projects */}
+            <div>
+              <div className="flex items-center justify-between mb-3">
+                <span className="text-xs font-semibold uppercase tracking-wider text-gray-500 dark:text-gray-400">
+                  Active Projects
+                </span>
+                <Link href="/projects" className="text-xs text-brand-600 dark:text-brand-400">
+                  See all
+                </Link>
+              </div>
+              {projects.length === 0 ? (
+                <EmptyState title="No active projects" detail="Create a project to get started." />
+              ) : (
+                <div className="space-y-2">
+                  {projects.map((p) => (
+                    <MobileProjectCard
+                      key={p.id}
+                      id={p.id}
+                      shortCode={p.shortCode}
+                      name={p.name}
+                      status={p.status}
+                    />
+                  ))}
+                </div>
+              )}
+            </div>
+
+            {/* Quick links */}
+            <div className="grid grid-cols-2 gap-3">
+              {(
+                [
+                  ["/timeline" as Route, "Timeline"],
+                  ["/bench" as Route, "Bench Board"],
+                  ["/allocations" as Route, "Allocations"],
+                  ["/staffing" as Route, "Staffing"],
+                ] as [Route, string][]
+              ).map(([href, label]) => (
+                <Link
+                  key={href}
+                  href={href}
+                  className="rounded-xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-900 px-4 py-3 text-sm font-medium text-gray-700 dark:text-gray-300 text-center hover:bg-gray-50 dark:hover:bg-gray-800 transition-colors"
+                >
+                  {label}
+                </Link>
+              ))}
+            </div>
+          </>
+        )}
+      </div>
+    </div>
+  );
+}