CUB-133: Build Dashboard page with summary cards

frontend/src/pages/Dashboard.tsx

@@ -0,0 +1,139 @@
+import { useQuery } from '@tanstack/react-query'
+import { getFilaments, getPrintJobs } from '../services/api'
+import SummaryCard from '../components/SummaryCard'
+import RecentPrints from '../components/RecentPrints'
+import LoadingSpinner from '../components/LoadingSpinner'
+import { Package, AlertTriangle, Printer, DollarSign, Plus, List } from 'lucide-react'
+
+export default function Dashboard() {
+  const {
+    data: filamentData,
+    isLoading: filamentLoading,
+    error: filamentError,
+  } = useQuery({
+    queryKey: ['filaments', 'count'],
+    queryFn: () => getFilaments({ limit: 1 }),
+  })
+
+  const {
+    data: lowStockData,
+    isLoading: lowStockLoading,
+    error: lowStockError,
+  } = useQuery({
+    queryKey: ['filaments', 'lowStock'],
+    queryFn: () => getFilaments({ low_stock: true, limit: 1 }),
+  })
+
+  const {
+    data: recentPrints,
+    isLoading: printsLoading,
+    error: printsError,
+  } = useQuery({
+    queryKey: ['printJobs', 'recent'],
+    queryFn: () => getPrintJobs({ limit: 5 }),
+  })
+
+  const {
+    data: allPrints,
+    isLoading: costLoading,
+    error: costError,
+  } = useQuery({
+    queryKey: ['printJobs', 'all'],
+    queryFn: () => getPrintJobs({ limit: 1000 }),
+  })
+
+  const totalSpools = filamentData?.total ?? 0
+  const lowStockCount = lowStockData?.total ?? 0
+  const recentPrintJobs = recentPrints?.data ?? []
+
+  // Calculate cost this month from all print jobs
+  const now = new Date()
+  const currentMonth = now.getMonth()
+  const currentYear = now.getFullYear()
+  const monthlyCost =
+    allPrints?.data
+      .filter((job) => {
+        const d = new Date(job.started_at)
+        return d.getMonth() === currentMonth && d.getFullYear() === currentYear
+      })
+      .reduce((sum, job) => sum + (job.cost_usd ?? 0), 0) ?? 0
+
+  const isLoading = filamentLoading || lowStockLoading || printsLoading || costLoading
+  const error = filamentError || lowStockError || printsError || costError
+
+  if (isLoading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-slate-900">
+        <LoadingSpinner />
+      </div>
+    )
+  }
+
+  if (error) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-slate-900">
+        <div className="p-6 rounded-lg bg-red-900/30 border border-red-500 text-red-200 max-w-md">
+          <h2 className="text-xl font-bold mb-2">Error</h2>
+          <p className="text-sm">{(error as Error).message || 'Failed to load dashboard data.'}</p>
+        </div>
+      </div>
+    )
+  }
+
+  return (
+    <div className="min-h-screen bg-slate-900 p-4 md:p-8">
+      <div className="max-w-6xl mx-auto">
+        <header className="mb-8">
+          <h1 className="text-3xl font-bold text-emerald-400 mb-2">Dashboard</h1>
+          <p className="text-slate-400">Overview of your Extrudex inventory and prints</p>
+        </header>
+
+        {/* Summary Cards Grid */}
+        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4 mb-8">
+          <SummaryCard
+            title="Total Spools"
+            value={totalSpools}
+            icon={Package}
+            color="emerald"
+          />
+          <SummaryCard
+            title="Low Stock"
+            value={lowStockCount}
+            icon={AlertTriangle}
+            color={lowStockCount > 0 ? 'amber' : 'emerald'}
+          />
+          <SummaryCard
+            title="Recent Prints"
+            value={recentPrintJobs.length}
+            icon={Printer}
+            color="sky"
+          />
+          <SummaryCard
+            title="Cost This Month"
+            value={`$${monthlyCost.toFixed(2)}`}
+            icon={DollarSign}
+            color="violet"
+          />
+        </div>
+
+        {/* Quick Actions */}
+        <div className="flex flex-wrap gap-3 mb-8">
+          <button className="flex items-center gap-2 px-4 py-2 rounded-lg bg-emerald-600 hover:bg-emerald-500 text-white font-medium transition-colors active:scale-95 touch-manipulation">
+            <Plus size={18} />
+            Add Spool
+          </button>
+          <button className="flex items-center gap-2 px-4 py-2 rounded-lg bg-slate-700 hover:bg-slate-600 text-slate-100 font-medium transition-colors active:scale-95 touch-manipulation">
+            <List size={18} />
+            View Inventory
+          </button>
+        </div>
+
+        {/* Recent Prints Section */}
+        <section>
+          <h2 className="text-xl font-semibold text-slate-100 mb-4">Recent Prints</h2>
+          <RecentPrints jobs={recentPrintJobs} />
+        </section>
+      </div>
+    </div>
+  )
+}