feat: weather precip/wind, dashboard mic, remove global voice overlay

- WeatherCard: show precipitation (mm) and max wind speed per forecast day
- DashboardChatInput: add PTT mic button (transcribe-to-input, voice-gated)
- Remove global VoiceOverlay floating button and Space PTT shortcut from
  App.vue — inline mic buttons in chat/briefing/dashboard are the right UX;
  global overlay had focus/latency/context issues

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

frontend/src/components/DashboardChatInput.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
-import { ref, nextTick } from "vue";
-import { apiGet } from "@/api/client";
+import { ref, nextTick, onMounted } from "vue";
+import { apiGet, getVoiceStatus, transcribeAudio } from "@/api/client";
+import { useVoiceRecorder } from "@/composables/useVoiceRecorder";
 import { useChatStore } from "@/stores/chat";
 import type { Note } from "@/types/note";
 
@@ -106,6 +107,39 @@ function focus() {
   inputEl.value?.focus();
 }
 
+// Voice PTT
+const voiceEnabled = ref(false);
+const transcribingVoice = ref(false);
+const recorder = useVoiceRecorder();
+
+onMounted(async () => {
+  try {
+    const status = await getVoiceStatus();
+    voiceEnabled.value = status.enabled && status.stt;
+  } catch { /* voice absent */ }
+});
+
+async function startPtt() {
+  if (!voiceEnabled.value || recorder.recording.value) return;
+  await recorder.startRecording();
+}
+
+async function stopPtt() {
+  if (!recorder.recording.value) return;
+  transcribingVoice.value = true;
+  try {
+    const blob = await recorder.stopRecording();
+    const { transcript } = await transcribeAudio(blob);
+    if (transcript.trim()) {
+      messageInput.value = (messageInput.value ? messageInput.value + " " : "") + transcript.trim();
+      await nextTick();
+      autoResize();
+    }
+  } catch { /* transcription failed silently */ } finally {
+    transcribingVoice.value = false;
+  }
+}
+
 defineExpose({ focus });
 </script>
 
@@ -188,6 +222,27 @@ defineExpose({ focus });
         rows="1"
       ></textarea>
 
+      <button
+        v-if="voiceEnabled && recorder.isSupported"
+        class="btn-attach btn-mic-ptt"
+        :class="{ 'mic-recording': recorder.recording.value, 'mic-transcribing': transcribingVoice }"
+        @mousedown.prevent="startPtt"
+        @mouseup.prevent="stopPtt"
+        @touchstart.prevent="startPtt"
+        @touchend.prevent="stopPtt"
+        :disabled="transcribingVoice || !store.chatReady"
+        :title="recorder.recording.value ? 'Release to send' : 'Hold to speak'"
+        aria-label="Push to talk"
+      >
+        <svg v-if="!transcribingVoice" width="17" height="17" viewBox="0 0 24 24" fill="currentColor">
+          <path d="M12 14c1.66 0 3-1.34 3-3V5c0-1.66-1.34-3-3-3S9 3.34 9 5v6c0 1.66 1.34 3 3 3zm-1-9c0-.55.45-1 1-1s1 .45 1 1v6c0 .55-.45 1-1 1s-1-.45-1-1V5zm6 6c0 2.76-2.24 5-5 5s-5-2.24-5-5H5c0 3.53 2.61 6.43 6 6.92V21h2v-3.08c3.39-.49 6-3.39 6-6.92h-2z"/>
+        </svg>
+        <svg v-else width="17" height="17" viewBox="0 0 24 24" fill="currentColor">
+          <circle cx="12" cy="12" r="8" opacity="0.35"/>
+          <circle cx="12" cy="12" r="4"/>
+        </svg>
+      </button>
+
       <button
         class="btn-send"
         @click="onSubmit"
@@ -348,4 +403,16 @@ defineExpose({ focus });
   opacity: 0.35;
   cursor: default;
 }
+
+.btn-mic-ptt {
+  transition: color 0.15s, opacity 0.15s;
+}
+.btn-mic-ptt.mic-recording {
+  color: #ef4444;
+  opacity: 1;
+}
+.btn-mic-ptt.mic-transcribing {
+  color: var(--color-primary);
+  opacity: 1;
+}
 </style>