feat(recording): micMuted state + toggleMute synced to recording://mic

src/lib/stores/recording.svelte.ts

@@ -22,6 +22,9 @@ class RecordingStore {
    * (FR-CAP-7); stays 0 when the mic is disabled or not recording. */
   levelRmsMic = $state(0);
   levelPeakMic = $state(0);
+  /** Mic muted for the in-flight meeting (FR-CAP-7): mic channel goes silent
+   * while loopback keeps recording. Toggled by the "M" key / mute button. */
+  micMuted = $state(false);
   /** Set while a capture-device reconnect is in progress; cleared on recovery (FR-CAP-6). */
   deviceNotice = $state<string | null>(null);
   /** Live notes redesign: freeform text typed in the Notes pane while recording. */
@@ -72,6 +75,22 @@ class RecordingStore {
     await events.onDeviceChanged(({ recovered, message }) => {
       this.deviceNotice = recovered ? null : message;
     });
+    // Keep mute state in sync even if it was toggled elsewhere (e.g. a future
+    // tray control), not just from this store's toggleMute().
+    await events.onMicMuted(({ muted }) => {
+      this.micMuted = muted;
+    });
+  }
+
+  /** Toggle mic mute for the active recording (FR-CAP-7); no-op if not
+   * recording. Optimistically flips, then reconciles with the backend result. */
+  async toggleMute() {
+    if (!this.meetingId || this.state === "idle") return;
+    try {
+      this.micMuted = await api.toggleMicrophoneMute(this.meetingId);
+    } catch {
+      // Mic off for this meeting (or capture gone) — nothing to mute.
+    }
   }
 
   async start(title?: string, record = false, templateId?: string, calendarEventId?: string) {
@@ -79,6 +98,7 @@ class RecordingStore {
     this.speakers = [];
     this.retention = record;
     this.deviceNotice = null;
+    this.micMuted = false;
     this.notesText = "";
     this.segmentNotes.clear();
     // T8.7/FR-TRX-4: whatever language is currently configured in Settings
@@ -98,6 +118,7 @@ class RecordingStore {
     this.levelPeak = 0;
     this.levelRmsMic = 0;
     this.levelPeakMic = 0;
+    this.micMuted = false;
     this.deviceNotice = null;
   }
 
@@ -116,6 +137,7 @@ class RecordingStore {
     this.levelPeak = 0;
     this.levelRmsMic = 0;
     this.levelPeakMic = 0;
+    this.micMuted = false;
     this.deviceNotice = null;
     this.notesText = "";
     this.segmentNotes.clear();