feat(briefing): add WeatherCard.vue component

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

frontend/src/components/WeatherCard.vue

@@ -0,0 +1,168 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+
+interface ForecastDay {
+  day: string
+  condition: string
+  high: number
+  low: number
+}
+
+interface WeatherData {
+  location: string
+  fetched_at: string
+  current_temp: number
+  condition: string
+  today_high: number | null
+  today_low: number | null
+  yesterday_high: number | null
+  yesterday_low: number | null
+  forecast: ForecastDay[]
+}
+
+const props = defineProps<{
+  weather: WeatherData | null
+  tempUnit?: string
+}>()
+
+const unit = computed(() => props.tempUnit ?? 'C')
+
+const tempDelta = computed(() => {
+  const w = props.weather
+  if (!w || w.today_high == null || w.yesterday_high == null) return null
+  const diff = w.today_high - w.yesterday_high
+  if (Math.abs(diff) < 1) return 'Same as yesterday'
+  const dir = diff > 0 ? 'warmer' : 'cooler'
+  return `${Math.abs(diff)}° ${dir} than yesterday`
+})
+
+const fetchedAtLabel = computed(() => {
+  if (!props.weather?.fetched_at) return ''
+  try {
+    return new Date(props.weather.fetched_at).toLocaleTimeString([], {
+      hour: '2-digit',
+      minute: '2-digit',
+    })
+  } catch {
+    return ''
+  }
+})
+</script>
+
+<template>
+  <div v-if="weather" class="weather-card">
+    <div class="weather-header">
+      <span class="weather-location">{{ weather.location }}</span>
+      <span class="weather-fetched-at">as of {{ fetchedAtLabel }}</span>
+    </div>
+    <div class="weather-current">
+      <span class="weather-temp">{{ weather.current_temp }}°{{ unit }}</span>
+      <span class="weather-condition">{{ weather.condition }}</span>
+    </div>
+    <div class="weather-today" v-if="weather.today_high != null">
+      Today: {{ weather.today_high }}° / {{ weather.today_low }}°
+      <span v-if="tempDelta" class="weather-delta"> · {{ tempDelta }}</span>
+    </div>
+    <div class="weather-forecast" v-if="weather.forecast.length">
+      <div v-for="day in weather.forecast" :key="day.day" class="weather-forecast-day">
+        <span class="forecast-day-name">{{ day.day }}</span>
+        <span class="forecast-condition">{{ day.condition }}</span>
+        <span class="forecast-temps">{{ day.high }}° / {{ day.low }}°</span>
+      </div>
+    </div>
+  </div>
+  <div v-else class="weather-card weather-unavailable">
+    Weather data unavailable — will retry at next slot.
+  </div>
+</template>
+
+<style scoped>
+.weather-card {
+  background: color-mix(in srgb, var(--color-surface) 80%, transparent);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-lg);
+  padding: 1rem 1.25rem;
+  margin-bottom: 1rem;
+  font-size: 0.9rem;
+}
+
+.weather-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: baseline;
+  margin-bottom: 0.5rem;
+}
+
+.weather-location {
+  font-weight: 600;
+  font-size: 0.95rem;
+}
+
+.weather-fetched-at {
+  color: var(--color-text-muted);
+  font-size: 0.78rem;
+}
+
+.weather-current {
+  display: flex;
+  align-items: baseline;
+  gap: 0.75rem;
+  margin-bottom: 0.35rem;
+}
+
+.weather-temp {
+  font-size: 1.8rem;
+  font-weight: 700;
+  line-height: 1;
+}
+
+.weather-condition {
+  color: var(--color-text-muted);
+}
+
+.weather-today {
+  color: var(--color-text-secondary);
+  margin-bottom: 0.75rem;
+}
+
+.weather-delta {
+  color: var(--color-text-muted);
+  font-size: 0.85rem;
+}
+
+.weather-forecast {
+  display: flex;
+  gap: 0.5rem;
+  overflow-x: auto;
+  padding-top: 0.5rem;
+  border-top: 1px solid var(--color-border);
+}
+
+.weather-forecast-day {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 0.2rem;
+  min-width: 3.5rem;
+  font-size: 0.8rem;
+}
+
+.forecast-day-name {
+  font-weight: 600;
+}
+
+.forecast-condition {
+  color: var(--color-text-muted);
+  font-size: 0.75rem;
+  text-align: center;
+}
+
+.forecast-temps {
+  white-space: nowrap;
+}
+
+.weather-unavailable {
+  color: var(--color-text-muted);
+  font-style: italic;
+}
+</style>