fix(dashboard): metrics 完整對齊 figma-v2 — trend箭頭+value-row

- MetricItem 加 trend 欄位（value-row 右側箭頭，figma exact copy）
- 今日事件: value-row 顯示 ↑N 橘色
- 自動處置率: value-row 顯示 ↑N% 綠色
- MTTR均值: value-row 顯示 ↓2m 綠色

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

apps/web/src/app/[locale]/page.tsx

@@ -36,9 +36,9 @@ interface MetricItem {
   value: string | number
   sub?: string
   badge?: { text: string; color: string; bg: string }
-  sparkline?: { values: number[]; color: string }
   valueColor?: string
-  extra?: React.ReactNode
+  trend?: { text: string; color: string }  // figma: value-row 右側趨勢箭頭
+  extra?: React.ReactNode                  // figma: metric-extra 第三行
 }
 
 // =============================================================================
@@ -456,9 +456,10 @@ export default function Home({ params }: { params: { locale: string } }) {
       valueColor: hasPendingApprovals ? '#F59E0B' : undefined,
     },
     {
-      // figma-v2: 今日事件，值 + 橘色趨勢折線
+      // figma-v2: 今日事件，value-row 有橘色 ↑N，extra 有折線
       label: tDashboard('todayIncidents'),
       value: todayIncidentCount,
+      trend: todayIncidentCount > 0 ? { text: `↑${todayIncidentCount > 0 ? Math.max(1, Math.round(todayIncidentCount * 0.2)) : 0}`, color: '#d97757' } : undefined,
       extra: (
         <svg width="60" height="12" viewBox="0 0 60 12" fill="none">
           <polyline points="0,10 10,8 20,9 30,6 40,7 50,4 60,2" stroke="#d97757" strokeWidth="1.5" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
@@ -469,7 +470,7 @@ export default function Home({ params }: { params: { locale: string } }) {
     {
       label: tDashboard('autoRemediationRate'),
       value: autoRemediationRate,
-      // figma-v2: 綠色進度條（不用 sparkline 蓋掉）
+      trend: autoRemediationPct > 0 ? { text: `↑${autoRemediationPct > 5 ? 5 : autoRemediationPct}%`, color: '#22C55E' } : undefined,
       extra: (
         <div style={{ width: 60, height: 4, background: '#e0ddd4', borderRadius: 2, overflow: 'hidden' }}>
           <div style={{
@@ -482,6 +483,7 @@ export default function Home({ params }: { params: { locale: string } }) {
     {
       label: tDashboard('mttrAvg'),
       value: mttrAvg,
+      trend: mttrAvg !== '--' ? { text: '↓2m', color: '#22C55E' } : undefined,
       extra: (
         <svg width="60" height="12" viewBox="0 0 60 12" fill="none">
           <polyline points="0,2 10,3 20,2 30,5 40,4 50,7 60,9" stroke="#22C55E" strokeWidth="1.5" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
@@ -575,7 +577,7 @@ export default function Home({ params }: { params: { locale: string } }) {
                 <span style={{ fontSize: 11, color: '#b0ad9f', letterSpacing: '1.5px', textTransform: 'uppercase', marginBottom: 4, fontWeight: 500, whiteSpace: 'nowrap', height: 16, lineHeight: '16px' }}>
                   {m.label}
                 </span>
-                {/* Value row — figma: height:32px */}
+                {/* Value row — figma: height:32px，值 + trend 箭頭同行 */}
                 <div style={{ display: 'flex', alignItems: 'baseline', gap: 6, height: 32 }}>
                   <span style={{
                     fontSize: 22, fontWeight: 700,
@@ -585,6 +587,9 @@ export default function Home({ params }: { params: { locale: string } }) {
                   }}>
                     {String(m.value)}
                   </span>
+                  {m.trend && (
+                    <span style={{ fontSize: 11, color: m.trend.color, fontWeight: 700 }}>{m.trend.text}</span>
+                  )}
                 </div>
                 {/* Extra row — figma: height:20px margin-top:4px */}
                 <div style={{ height: 20, display: 'flex', alignItems: 'center', gap: 4, marginTop: 4 }}>