Mac: stabilize voice wake test flow

Why: voice wake tests often delivered partial/final transcripts without reliable word timings, so trigger matching failed, timeouts overwrote detections, and test runs/mic capture kept running after UI changes.

What: add text-only/prefix fallback and silence-based detection in the test flow, stop/clean up any prior test, cancel timeout on detection/stop, and tear down meter/test when the Voice Wake tab is inactive. Runtime detection now falls back on final text-only matches when timing is missing. UI state now reflects finalizing and prevents hanging tests.

apps/macos/Sources/Clawdbot/VoiceWakeTestCard.swift

@@ -57,6 +57,9 @@ struct VoiceWakeTestCard: View {
                     .symbolEffect(.pulse)
                     .foregroundStyle(Color.accentColor))
 
+        case .finalizing:
+            AnyView(ProgressView().controlSize(.small))
+
         case .detected:
             AnyView(Image(systemName: "checkmark.circle.fill").foregroundStyle(.green))
 
@@ -79,6 +82,9 @@ struct VoiceWakeTestCard: View {
         case let .hearing(text):
             "Heard: \(text)"
 
+        case .finalizing:
+            "Finalizing…"
+
         case .detected:
             "Voice wake detected!"