feat: add transcription pause controls

MeetingAssistant.Tests/NotificationActivationArgumentsTests.cs

@@ -25,4 +25,16 @@ public sealed class NotificationActivationArgumentsTests
         Assert.Equal("abc123", arguments["promptId"]);
         Assert.Equal("continue", arguments["response"]);
     }
+
+    [Fact]
+    public void InactivityPromptActionsIncludePauseAndParseItsResponse()
+    {
+        Assert.Contains(
+            MeetingInactivityPromptActions.All,
+            action => action.Content == "Pause transcription" &&
+                      action.ResponseArgument == "pause");
+        Assert.Equal(
+            MeetingInactivityPromptResponse.Pause,
+            MeetingInactivityPromptActions.ParseResponse("pause"));
+    }
 }