Keep recording-error alerts from ending the open DM

Voice recording happens inside the people/DM sheet, but its error alert
was still presented unconditionally from the root view. A mic-permission
failure therefore force-dismissed the sheet and ended the conversation
through exactly the reconciliation path this branch fixes for the
Bluetooth alert.

Treat it the same way: the sheet-dismiss guard now also ignores
reconciliation while the voice alert is up, the root copy of the alert
defers to any other root modal (people sheet included), and the sheet
presents its own copy gated on the sheet's modal state. The voice alert
keeps priority over the Bluetooth alert on both levels via the existing
isVoiceAlertPresented flag, now mirrored into the people-sheet state.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

bitchatTests/ViewSmokeTests.swift

@@ -579,6 +579,20 @@ struct ViewSmokeTests {
         )
     }
 
+    @Test("Bluetooth alerts wait for the voice recording error alert")
+    func bluetoothAlertGuards_includeVoiceAlert() {
+        #expect(
+            ContentRootModalPresentationState(
+                isVoiceAlertPresented: true
+            ).hasPresentation
+        )
+        #expect(
+            ContentPeopleSheetModalPresentationState(
+                isVoiceAlertPresented: true
+            ).hasPresentation
+        )
+    }
+
     @Test("Root Bluetooth alert waits for screenshot privacy alert")
     @MainActor
     func rootBluetoothAlertGuard_tracksScreenshotPrivacyState() {