feat(ui): track microphone level separately in the recording store

src/lib/stores/recording.svelte.ts

@@ -12,9 +12,13 @@ class RecordingStore {
   segments = $state<TranscriptSegment[]>([]);
   /** Whether audio is being retained as .wav for the in-flight meeting (ADR-0009). */
   retention = $state(false);
-  /** Live input level for the waveform/meter (FR-CAP-5); 0 when not recording. */
+  /** Live system/loopback level for the waveform/meter (FR-CAP-5); 0 when not recording. */
   levelRms = $state(0);
   levelPeak = $state(0);
+  /** Live microphone level, overlaid on the meter in a different colour
+   * (FR-CAP-7); stays 0 when the mic is disabled or not recording. */
+  levelRmsMic = $state(0);
+  levelPeakMic = $state(0);
   /** 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. */
@@ -35,6 +39,8 @@ class RecordingStore {
       if (ended) {
         this.levelRms = 0;
         this.levelPeak = 0;
+        this.levelRmsMic = 0;
+        this.levelPeakMic = 0;
       }
     });
     await events.onRetention((p) => {
@@ -46,9 +52,14 @@ class RecordingStore {
       if (i >= 0) this.segments[i] = segment;
       else this.segments.push(segment);
     });
-    await events.onLevel(({ rms, peak }) => {
-      this.levelRms = rms;
-      this.levelPeak = peak;
+    await events.onLevel(({ rms, peak, mic }) => {
+      if (mic) {
+        this.levelRmsMic = rms;
+        this.levelPeakMic = peak;
+      } else {
+        this.levelRms = rms;
+        this.levelPeak = peak;
+      }
     });
     await events.onDeviceChanged(({ recovered, message }) => {
       this.deviceNotice = recovered ? null : message;
@@ -76,6 +87,8 @@ class RecordingStore {
     this.state = "idle";
     this.levelRms = 0;
     this.levelPeak = 0;
+    this.levelRmsMic = 0;
+    this.levelPeakMic = 0;
     this.deviceNotice = null;
   }
 
@@ -91,6 +104,8 @@ class RecordingStore {
     this.state = "idle";
     this.levelRms = 0;
     this.levelPeak = 0;
+    this.levelRmsMic = 0;
+    this.levelPeakMic = 0;
     this.deviceNotice = null;
     this.notesText = "";
     this.segmentNotes.clear();