Refactor Voice Messages (#1075)

* Extract voice-related code to a dedicated VM

* Minor optimization of permission request + fix ui bug

When isPreparing is being set to true before permission is granted, the UI is shown for a fraction of a second and it’s even worse if the permission is being asked constantly if the user drags the finger even when the alert is shown

* Remove dead code

* Remove unnecessary delegate conformance

* `actor VoiceRecorder` + other minor improvements

* Centralized opening system settings + open for mic access

* Better voice-recording state handling with Enum

* Remove manual timer management

* Simplify formatting + avoid jumping UI w/ countdown

* Add `requestingPermission` state to avoid repetitive calls

* Improve guarding of the states after awaits

* Fix potential “actor reentrancy across awaits” issue

* Remove short-circuiting on .idle + guard before error

* Fix playbackLabel’s formatting for duration vs remainder

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Co-authored-by: jack <212554440+jackjackbits@users.noreply.github.com>

bitchatTests/ViewSmokeTests.swift

@@ -436,13 +436,12 @@ struct ViewSmokeTests {
         playback.stop()
         VoiceNotePlaybackCoordinator.shared.activate(playback)
         VoiceNotePlaybackCoordinator.shared.deactivate(playback)
-        VoiceRecorder.shared.cancelRecording()
+        await VoiceRecorder.shared.cancelRecording()
 
         #expect(bins.count == 16)
         #expect(WaveformCache.shared.cachedWaveform(for: audioURL)?.count == 16)
         #expect(playback.duration > 0)
         #expect(playback.progress == 0)
-        #expect(VoiceRecorder.shared.currentAveragePower() <= 0)
     }
 
     #if os(iOS)