diff --git a/frontend/src/api/conversation.ts b/frontend/src/api/conversation.ts
index 41acf20..1252dca 100644
--- a/frontend/src/api/conversation.ts
+++ b/frontend/src/api/conversation.ts
@@ -101,7 +101,8 @@ export const conversationApi = {
     handlers: ChatStreamHandlers = {},
   ) {
     const token = localStorage.getItem('access_token')
-    const response = await fetch(`${import.meta.env.VITE_API_URL}/api/conversations/chat/stream`, {
+    const baseURL = import.meta.env.DEV ? '' : import.meta.env.VITE_API_URL
+    const response = await fetch(`${baseURL}/api/conversations/chat/stream`, {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
diff --git a/frontend/src/pages/chat/composables/useClientTime.ts b/frontend/src/pages/chat/composables/useClientTime.ts
index fcdf371..9e5640d 100644
--- a/frontend/src/pages/chat/composables/useClientTime.ts
+++ b/frontend/src/pages/chat/composables/useClientTime.ts
@@ -13,17 +13,53 @@ export function useClientTime() {
   const weatherSummary = ref('Weather unavailable')
   const weatherCode = ref<number | null>(null)
   let clientTimeTimer: ReturnType<typeof setInterval> | null = null
+  const WEATHER_CACHE_KEY = 'jarvis:clientWeather'
 
-  // Load location from backend config
-  async function loadLocation() {
+  function loadWeatherCache() {
+    if (typeof window === 'undefined') return
+    try {
+      const raw = window.localStorage.getItem(WEATHER_CACHE_KEY)
+      if (!raw) return
+      const parsed = JSON.parse(raw) as { city?: string; weather_summary?: string; weather_code?: number | null; cached_at?: number }
+      if (typeof parsed.city === 'string' && parsed.city.trim()) city.value = parsed.city
+      if (typeof parsed.weather_summary === 'string' && parsed.weather_summary.trim()) weatherSummary.value = parsed.weather_summary
+      if (typeof parsed.weather_code === 'number') weatherCode.value = parsed.weather_code
+    } catch {
+      // ignore cache parse errors
+    }
+  }
+
+  function saveWeatherCache(payload: { city: string; weather_summary: string; weather_code: number | null }) {
+    if (typeof window === 'undefined') return
+    try {
+      window.localStorage.setItem(WEATHER_CACHE_KEY, JSON.stringify({ ...payload, cached_at: Date.now() }))
+    } catch {
+      // ignore storage errors
+    }
+  }
+
+  // Read cache synchronously during setup to avoid initial render flicker (icon showing as X/na).
+  loadWeatherCache()
+
+  async function loadSystemConfig() {
     try {
       const response = await fetch('/api/system/config')
-      if (response.ok) {
-        const config = await response.json()
-        city.value = config.location || 'Location'
-      }
+      if (!response.ok) throw new Error('system config request failed')
+      const config = await response.json()
+      city.value = typeof config.location === 'string' && config.location.trim() ? config.location : 'Location'
+      weatherCode.value = typeof config.weather_code === 'number' ? config.weather_code : null
+      weatherSummary.value = typeof config.weather_summary === 'string' && config.weather_summary.trim()
+        ? config.weather_summary
+        : 'Weather unavailable'
+      saveWeatherCache({ city: city.value, weather_summary: weatherSummary.value, weather_code: weatherCode.value })
     } catch {
-      city.value = import.meta.env.VITE_LOCATION || 'Location'
+      // If we already have cached weather on screen, keep it to avoid UI flicker (icon showing as "X"/na).
+      const hasExistingWeather = weatherCode.value !== null || (weatherSummary.value && weatherSummary.value !== 'Weather unavailable')
+      if (!hasExistingWeather) {
+        city.value = 'Location'
+        weatherCode.value = null
+        weatherSummary.value = 'Weather unavailable'
+      }
     }
   }
 
@@ -40,6 +76,27 @@ export function useClientTime() {
   }
 
   function weatherCodeLabel(code: number | null | undefined) {
+    // Backend may return wttr.in condition codes (e.g. 113/116/119...), normalize to user-friendly labels.
+    if (typeof code === 'number' && code > 99) {
+      if (code === 113) return 'Clear'
+      if (code === 116) return 'Partly Cloudy'
+      if (code === 119 || code === 122) return 'Overcast'
+      if (code === 143) return 'Fog'
+      if ([200, 386, 389].includes(code)) return 'Thunderstorm'
+      if (
+        [
+          176, 263, 266, 281, 293, 296, 299, 302, 305, 308,
+          311, 314, 317, 350, 353, 356, 359, 362,
+        ].includes(code)
+      ) return 'Rain'
+      if (
+        [
+          179, 182, 185, 227, 230, 323, 326, 329, 332, 335,
+          338, 368, 371, 374, 377, 392, 395,
+        ].includes(code)
+      ) return 'Snow'
+      return 'Weather'
+    }
     if (code === 0) return 'Clear'
     if (code === 1 || code === 2) return 'Partly Cloudy'
     if (code === 3) return 'Overcast'
@@ -48,11 +105,34 @@ export function useClientTime() {
     if ([61, 63, 65, 66, 67, 80, 81, 82].includes(code ?? -1)) return 'Rain'
     if ([71, 73, 75, 77, 85, 86].includes(code ?? -1)) return 'Snow'
     if ([95, 96, 99].includes(code ?? -1)) return 'Thunderstorm'
-    return 'Weather'
+    return 'Weather unavailable'
   }
 
   const weatherIcon = computed(() => {
     const code = weatherCode.value
+    if (code === null || code === undefined) return ''
+    // Support wttr.in weather codes (commonly 113/116/119/122/143/...).
+    if (typeof code === 'number' && code > 99) {
+      if (code === 113) return 'wi-day-sunny'
+      if (code === 116) return 'wi-day-cloudy'
+      if (code === 119) return 'wi-cloudy'
+      if (code === 122) return 'wi-cloudy'
+      if (code === 143) return 'wi-fog'
+      if ([200, 386, 389].includes(code)) return 'wi-thunderstorm'
+      if (
+        [
+          176, 263, 266, 281, 293, 296, 299, 302, 305, 308,
+          311, 314, 317, 350, 353, 356, 359, 362,
+        ].includes(code)
+      ) return 'wi-rain'
+      if (
+        [
+          179, 182, 185, 227, 230, 323, 326, 329, 332, 335,
+          338, 368, 371, 374, 377, 392, 395,
+        ].includes(code)
+      ) return 'wi-snow'
+      return ''
+    }
     if (code === 0) return 'wi-day-sunny'
     if (code === 1) return 'wi-day-cloudy'
     if (code === 2) return 'wi-day-cloudy-gusts'
@@ -65,68 +145,13 @@ export function useClientTime() {
     if ([66, 67, 81, 82].includes(code ?? -1)) return 'wi-rain'
     if ([71, 73, 75, 77, 85, 86].includes(code ?? -1)) return 'wi-snow'
     if ([95, 96, 99].includes(code ?? -1)) return 'wi-thunderstorm'
-    return 'wi-day-sunny'
+    return ''
   })
 
-  // Fallback: directly load weather with default location (Beijing)
-  async function loadWeatherByIP() {
-    console.log('[Weather] Using default location (Beijing) for weather')
-    const defaultLat = 39.9042
-    const defaultLon = 116.4074
-    await loadWeather(defaultLat, defaultLon)
-  }
-
-  async function loadWeather(latitude: number, longitude: number) {
-    console.log('[Weather] Loading weather for:', latitude, longitude)
-    try {
-      // Fetch weather data from Open-Meteo
-      const url = `https://api.open-meteo.com/v1/forecast?latitude=${latitude}&longitude=${longitude}&current=temperature_2m,weather_code&timezone=auto`
-      console.log('[Weather] Fetching:', url)
-      const weatherResp = await fetch(url)
-      console.log('[Weather] Response status:', weatherResp.status)
-      if (!weatherResp.ok) throw new Error('weather request failed')
-      const weatherData = await weatherResp.json()
-      console.log('[Weather] Response data:', JSON.stringify(weatherData))
-      const current = weatherData.current ?? {}
-      weatherCode.value = typeof current.weather_code === 'number' ? current.weather_code : null
-      const temp = typeof current.temperature_2m === 'number' ? `${Math.round(current.temperature_2m)}°C` : '--'
-      weatherSummary.value = `${weatherCodeLabel(current.weather_code)} ${temp}`
-      console.log('[Weather] Updated summary:', weatherSummary.value)
-
-      // Only fetch city name if not already set by config
-      if (city.value === 'Location') {
-        try {
-          const geoResp = await fetch(
-            `https://nominatim.openstreetmap.org/reverse?format=json&lat=${latitude}&lon=${longitude}&zoom=10`,
-          )
-          if (geoResp.ok) {
-            const geoData = await geoResp.json()
-            city.value = geoData.address?.city ?? geoData.address?.town ?? geoData.address?.county ?? geoData.display_name?.split(',')[0] ?? 'Location'
-          }
-        } catch {
-          city.value = 'Location'
-        }
-      }
-    } catch (err) {
-      console.warn('[Weather] API failed (keeping previous value):', err)
-      // Don't overwrite existing value on error - keep the default we set earlier
-    }
-  }
-
-  onMounted(() => {
+  onMounted(async () => {
     updateClientTime()
     clientTimeTimer = setInterval(updateClientTime, 1000)
-    void loadLocation()
-    
-    // Set default weather immediately
-    weatherCode.value = 0
-    weatherSummary.value = 'Clear 25°C'
-    city.value = 'Beijing'
-    
-    // Try to get real weather from Open-Meteo
-    const defaultLat = 39.9042
-    const defaultLon = 116.4074
-    loadWeather(defaultLat, defaultLon)
+    await loadSystemConfig()
   })
 
   onUnmounted(() => {
@@ -134,7 +159,15 @@ export function useClientTime() {
   })
 
   return {
-    clientTime, city, weatherSummary, weatherCode, weatherIcon,
-    updateClientTime, formatClientDate, formatClientClock, weatherCodeLabel, loadWeather
+    clientTime,
+    city,
+    weatherSummary,
+    weatherCode,
+    weatherIcon,
+    updateClientTime,
+    formatClientDate,
+    formatClientClock,
+    weatherCodeLabel,
+    loadSystemConfig,
   }
 }
diff --git a/frontend/src/pages/chat/composables/useSidebarPlan.ts b/frontend/src/pages/chat/composables/useSidebarPlan.ts
index 2499587..0610072 100644
--- a/frontend/src/pages/chat/composables/useSidebarPlan.ts
+++ b/frontend/src/pages/chat/composables/useSidebarPlan.ts
@@ -1,4 +1,4 @@
-import { computed, onMounted, ref, watch, toRef } from 'vue'
+import { computed, onMounted, ref, watch, type Ref } from 'vue'
 import { CornerDownLeft, Database, Sparkles, Sun, ListTodo } from 'lucide-vue-next'
 import { scheduleCenterApi, type ScheduleCenterDateResponse, type ScheduleCenterDaySummary } from '@/api/scheduleCenter'
 import type { Conversation } from '@/api/conversation'
@@ -18,20 +18,24 @@ export const sidebarCollapsedModules = [
   { id: 'review', label: '复盘', icon: CornerDownLeft },
 ]
 
-function formatDateKey(date: Date) {
-  const year = date.getUTCFullYear()
-  const month = String(date.getUTCMonth() + 1).padStart(2, '0')
-  const day = String(date.getUTCDate()).padStart(2, '0')
+export function formatDateKey(date: Date) {
+  const year = date.getFullYear()
+  const month = String(date.getMonth() + 1).padStart(2, '0')
+  const day = String(date.getDate()).padStart(2, '0')
   return `${year}-${month}-${day}`
 }
 
 function formatMonthKey(date: Date) {
-  const year = date.getUTCFullYear()
-  const month = String(date.getUTCMonth() + 1).padStart(2, '0')
+  const year = date.getFullYear()
+  const month = String(date.getMonth() + 1).padStart(2, '0')
   return `${year}-${month}`
 }
 
-export function useSidebarPlan(clientTimeRef: { value: Date }, loadDailyDigestFn: () => void, conversationsRef: Conversation[] = []) {
+export function useSidebarPlan(
+  clientTimeRef: { value: Date },
+  loadDailyDigestFn: () => void,
+  conversationsRef: Ref<Conversation[]> | Conversation[] = [],
+) {
   const todayPlanDetail = ref<ScheduleCenterDateResponse | null>(null)
   const monthPlanDays = ref<ScheduleCenterDaySummary[]>([])
   const selectedDate = ref<string | null>(null)
@@ -41,9 +45,7 @@ export function useSidebarPlan(clientTimeRef: { value: Date }, loadDailyDigestFn
     const map = new Map<string, boolean>()
     const conversations = Array.isArray(conversationsRef) ? conversationsRef : (conversationsRef.value ?? [])
     conversations.forEach((conv) => {
-      const date = new Date(conv.updated_at)
-      const dateKey = formatDateKey(date)
-      map.set(dateKey, true)
+      map.set(formatDateKey(new Date(conv.updated_at)), true)
     })
     return map
   })
@@ -52,22 +54,22 @@ export function useSidebarPlan(clientTimeRef: { value: Date }, loadDailyDigestFn
   const monthPlanSummaryMap = computed(() => new Map(monthPlanDays.value.map((item) => [item.date, item])))
 
   const calendarCells = computed(() => {
-    const year = clientTimeRef.value.getUTCFullYear()
-    const month = clientTimeRef.value.getUTCMonth()
-    const daysInMonth = new Date(Date.UTC(year, month + 1, 0)).getUTCDate()
-    const firstDayOffset = (new Date(Date.UTC(year, month, 1)).getUTCDay() + 6) % 7
-    const today = clientTimeRef.value.getUTCDate()
+    const year = clientTimeRef.value.getFullYear()
+    const month = clientTimeRef.value.getMonth()
+    const daysInMonth = new Date(year, month + 1, 0).getDate()
+    const firstDayOffset = (new Date(year, month, 1).getDay() + 6) % 7
+    const todayKey = todayDateKey.value
     const cells: Array<{ key: string; value: number | null; active: boolean; busy: boolean; selected: boolean; hasConversation: boolean }> = []
     for (let index = 0; index < firstDayOffset; index += 1) {
       cells.push({ key: `blank-start-${index}`, value: null, active: false, busy: false, selected: false, hasConversation: false })
     }
     for (let day = 1; day <= daysInMonth; day += 1) {
-      const monthDate = new Date(Date.UTC(year, month, day))
+      const monthDate = new Date(year, month, day)
       const dateKey = formatDateKey(monthDate)
       const summary = monthPlanSummaryMap.value.get(dateKey)
       const busy = Boolean(summary && (summary.todo_total + summary.task_due_total + summary.goal_total + summary.reminder_total) > 0)
       const hasConv = conversationDateMap.value.get(dateKey) || false
-      cells.push({ key: dateKey, value: day, active: day === today, busy, selected: dateKey === selectedDate.value, hasConversation: hasConv })
+      cells.push({ key: dateKey, value: day, active: dateKey === todayKey, busy, selected: dateKey === selectedDate.value, hasConversation: hasConv })
     }
     while (cells.length % 7 !== 0) {
       cells.push({ key: `blank-end-${cells.length}`, value: null, active: false, busy: false, selected: false, hasConversation: false })
@@ -75,8 +77,8 @@ export function useSidebarPlan(clientTimeRef: { value: Date }, loadDailyDigestFn
     return cells
   })
 
-  const calendarYear = computed(() => clientTimeRef.value.getUTCFullYear())
-  const calendarMonth = computed(() => clientTimeRef.value.getUTCMonth() + 1)
+  const calendarYear = computed(() => clientTimeRef.value.getFullYear())
+  const calendarMonth = computed(() => clientTimeRef.value.getMonth() + 1)
 
   const todayPlanCounters = computed(() => {
     const detail = todayPlanDetail.value
diff --git a/frontend/src/pages/chat/index.vue b/frontend/src/pages/chat/index.vue
index 95f2b89..249b979 100644
--- a/frontend/src/pages/chat/index.vue
+++ b/frontend/src/pages/chat/index.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref } from 'vue'
+import { ref, toRef } from 'vue'
 import {
   ChevronRight,
   Send,
@@ -25,7 +25,7 @@ import { useChatView } from '@/pages/chat/composables/useChatView'
 import { useKnowledgeView } from '@/pages/knowledge/composables/useKnowledgeView'
 import { useDailyDigest } from '@/pages/chat/composables/useDailyDigest'
 import { useClientTime, formatNetworkRate } from '@/pages/chat/composables/useClientTime'
-import { useSidebarPlan } from '@/pages/chat/composables/useSidebarPlan'
+import { useSidebarPlan, formatDateKey } from '@/pages/chat/composables/useSidebarPlan'
 
 // --- Chat view (core messaging logic) ---
 const {
@@ -79,7 +79,7 @@ const {
   sidebarFocusItems, sidebarReviewAchievements, sidebarReviewReflections,
   sidebarFeedItems, topbarFeedItems, sidebarCollapsedModules,
   selectedDate, selectCalendarDate
-} = useSidebarPlan(clientTime, loadDailyDigest, store.conversations)
+} = useSidebarPlan(clientTime, loadDailyDigest, toRef(store, 'conversations'))
 
 // --- Local UI state ---
 const sidebarCollapsed = ref(false)
@@ -118,27 +118,16 @@ function handleOpenPreview(doc: any) { previewDoc.value = doc }
 function handleCalendarDateSelect(dateKey: string) {
   selectCalendarDate(dateKey)
 
-  // Reload conversations to get latest data
   loadConversations().then(() => {
-    // Find conversation that matches the selected date (by updated_at)
-    // Use UTC to avoid timezone issues
-    const [year, month, day] = dateKey.split('-').map(Number)
-    const targetDateStart = new Date(Date.UTC(year, month - 1, day))
-    const targetDateEnd = new Date(Date.UTC(year, month - 1, day + 1))
-
-    // Find conversation that falls on the selected date
-    const conversations = store.conversations.value ?? store.conversations
-    const conversation = conversations.find((conv) => {
-      const convDate = new Date(conv.updated_at)
-      return convDate >= targetDateStart && convDate < targetDateEnd
-    })
+    const conversations = store.conversations
+    const conversation = conversations.find((conv: { id: string; updated_at: string }) => formatDateKey(new Date(conv.updated_at)) === dateKey)
 
     if (conversation) {
       selectConversation(conversation.id)
-    } else {
-      // No conversation for this date, create a new one
-      newConversation()
+      return
     }
+
+    newConversation()
   }).catch((err) => {
     console.error('[Calendar] Error loading conversations:', err)
   })
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 535afa4..4b0cf06 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,10 +1,44 @@
 import { defineConfig, loadEnv } from 'vite'
 import vue from '@vitejs/plugin-vue'
 import path from 'path'
+import fs from 'fs'
 
 export default defineConfig(({ mode }) => {
   const env = loadEnv(mode, __dirname, '')
 
+  function parseDotenvFile(filePath: string) {
+    try {
+      if (!fs.existsSync(filePath)) return {}
+      const text = fs.readFileSync(filePath, 'utf-8')
+      const result: Record<string, string> = {}
+      for (const rawLine of text.split(/\r?\n/)) {
+        const line = rawLine.trim()
+        if (!line || line.startsWith('#')) continue
+        const eq = line.indexOf('=')
+        if (eq <= 0) continue
+        const key = line.slice(0, eq).trim()
+        let value = line.slice(eq + 1).trim()
+        if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
+          value = value.slice(1, -1)
+        }
+        result[key] = value
+      }
+      return result
+    } catch {
+      return {}
+    }
+  }
+
+  // Vite only loads env files under `frontend/` by default.
+  // Many Jarvis setups keep HOST/PORT in repo root `.env`, so we read it explicitly as a fallback.
+  const rootEnvPath = path.resolve(__dirname, '../.env')
+  const rootEnv = parseDotenvFile(rootEnvPath)
+  const rootHost = (rootEnv.HOST || '127.0.0.1').trim()
+  const rootPort = (rootEnv.PORT || '').trim()
+  const rootApi = (rootEnv.VITE_API_URL || (rootPort ? `http://${rootHost}:${rootPort}` : '')).trim()
+
+  const apiTarget = env.VITE_API_URL || rootApi || 'http://localhost:8000'
+
   return {
   plugins: [vue()],
   resolve: {
@@ -15,7 +49,7 @@ export default defineConfig(({ mode }) => {
   server: {
     proxy: {
       '/api': {
-        target: env.VITE_API_URL,
+        target: apiTarget,
         changeOrigin: true,
       },
     },