feat: 添加麦克风权限状态提示，优化噪音监测体验

src/components/NoiseMonitorDetail.vue

@@ -83,6 +83,48 @@
         <v-tabs-window v-model="activeTab">
           <!-- ==================== 实时监测 ==================== -->
           <v-tabs-window-item value="realtime">
+            <!-- 麦克风不可用提示 -->
+            <v-alert
+              v-if="micPermissionState === 'denied'"
+              type="error"
+              variant="tonal"
+              class="ma-4 mb-0"
+              prominent
+            >
+              <template #prepend>
+                <v-icon
+                  icon="mdi-microphone-off"
+                  size="28"
+                />
+              </template>
+              <div class="text-subtitle-2 font-weight-bold mb-1">
+                麦克风权限被拒绝
+              </div>
+              <div class="text-body-2">
+                浏览器已拒绝麦克风访问，无法进行噪音监测。请在浏览器地址栏左侧的锁图标中重新授予麦克风权限，然后刷新页面。
+              </div>
+            </v-alert>
+            <v-alert
+              v-else-if="micPermissionState === 'unavailable'"
+              type="warning"
+              variant="tonal"
+              class="ma-4 mb-0"
+              prominent
+            >
+              <template #prepend>
+                <v-icon
+                  icon="mdi-microphone-question"
+                  size="28"
+                />
+              </template>
+              <div class="text-subtitle-2 font-weight-bold mb-1">
+                未检测到麦克风
+              </div>
+              <div class="text-body-2">
+                当前设备未检测到麦克风硬件，无法进行噪音监测。请连接麦克风后刷新页面重试。
+              </div>
+            </v-alert>
+
             <!-- 分贝仪表区 -->
             <div class="noise-dashboard pa-5">
               <div class="d-flex align-center justify-center">
@@ -344,6 +386,7 @@
                 prepend-icon="mdi-play"
                 size="large"
                 class="px-6"
+                :disabled="micPermissionState === 'denied' || micPermissionState === 'unavailable'"
                 @click="$emit('start')"
               >
                 开始监测
@@ -1006,6 +1049,7 @@ export default {
     lastSlice: { type: Object, default: null },
     history: { type: Array, default: () => [] },
     isMonitoring: { type: Boolean, default: false },
+    micPermissionState: { type: String, default: '' },
     sessionActive: { type: Boolean, default: false },
     sessionData: { type: Object, default: null },
     reportMeta: { type: Object, default: () => ({ dates: {} }) },

src/components/TimeCard.vue

@@ -39,7 +39,36 @@
           style="min-width: 80px;"
           @click.stop="onNoiseClick"
         >
-
+          <!-- 无麦克风权限提示 -->
+          <template v-if="micPermissionState === 'denied'">
+            <v-icon
+              color="error"
+              size="24"
+            >
+              mdi-microphone-off
+            </v-icon>
+            <div
+              class="text-caption text-error mt-1"
+              style="white-space: nowrap; font-size: 10px;"
+            >
+              权限被拒绝
+            </div>
+          </template>
+          <template v-else-if="micPermissionState === 'unavailable'">
+            <v-icon
+              color="warning"
+              size="24"
+            >
+              mdi-microphone-question
+            </v-icon>
+            <div
+              class="text-caption text-warning mt-1"
+              style="white-space: nowrap; font-size: 10px;"
+            >
+              无麦克风
+            </div>
+          </template>
+          <template v-else>
             <div
               class="noise-side-db font-weight-bold"
               :class="`text-${noiseDbColor}`"
@@ -61,6 +90,7 @@
             >
               点击开启
             </div>
+          </template>
         </div>
       </div>
     </v-card-text>
@@ -80,6 +110,7 @@
       :last-slice="noiseLastSlice"
       :history="noiseHistory"
       :is-monitoring="noiseMonitoring"
+      :mic-permission-state="micPermissionState"
       :session-active="noiseSessionActive"
       :session-data="noiseSessionData"
       :report-meta="noiseReportMeta"
@@ -749,6 +780,7 @@ export default {
       noiseCurrentDateReports: [], // 当前日期的报告列表
       // 麦克风权限引导
       showMicPermissionDialog: false,
+      micPermissionState: '', // 'granted' | 'prompt' | 'denied' | 'unavailable'
     }
   },
   computed: {
@@ -925,6 +957,7 @@ export default {
       this.noiseHistory = noiseService.getHistory()
       // 检查麦克风权限状态
       const micState = await this.checkMicPermission()
+      this.micPermissionState = micState
       if (micState === 'granted') {
         // 已授权 → 正常流程
         this.loadNoiseSessionConfig().then(() => {
@@ -939,7 +972,7 @@ export default {
           this.showMicPermissionDialog = true
         }
       }
-      // denied → 什么也不做
+      // denied / unavailable → 不自动启动，micPermissionState 已记录
     }
   },
   beforeUnmount() {
@@ -1124,7 +1157,13 @@ export default {
     // ===== 麦克风权限引导 =====
     async checkMicPermission() {
       try {
-        if (!navigator.permissions || !navigator.permissions.query) return 'granted' // 不支持 Permissions API 时视为已授权
+        // 先检查是否有麦克风硬件
+        if (navigator.mediaDevices && navigator.mediaDevices.enumerateDevices) {
+          const devices = await navigator.mediaDevices.enumerateDevices()
+          const hasMic = devices.some(d => d.kind === 'audioinput')
+          if (!hasMic) return 'unavailable'
+        }
+        if (!navigator.permissions || !navigator.permissions.query) return 'granted'
         const result = await navigator.permissions.query({ name: 'microphone' })
         return result.state // 'granted' | 'prompt' | 'denied'
       } catch {
@@ -1139,6 +1178,8 @@ export default {
       this.startSessionCheck()
       // 调用 startNoise 触发浏览器权限弹框
       await this.startNoise()
+      // 重新检查状态
+      this.micPermissionState = await this.checkMicPermission()
     },
     dismissMicPermission() {
       this.showMicPermissionDialog = false
@@ -1202,6 +1243,10 @@ export default {
       this.noiseHistory = []
     },
     onNoiseClick() {
+      if (this.micPermissionState === 'denied' || this.micPermissionState === 'unavailable') {
+        this.showNoiseDetail = true
+        return
+      }
       if (!this.noiseMonitoring) {
         this.startNoise()
       } else {