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>

bitchat/Features/voice/VoiceNotePlaybackController.swift

@@ -9,6 +9,18 @@ final class VoiceNotePlaybackController: NSObject, ObservableObject, AVAudioPlay
     @Published private(set) var duration: TimeInterval = 0
     @Published private(set) var progress: Double = 0
 
+    /// rounded so 4.9s shows "00:05"
+    var roundedDuration: Int {
+        guard duration.isFinite else { return 0 }
+        return Int(duration.rounded())
+    }
+
+    /// ceil so "00:01" stays visible until playback ends, capped to rounded duration
+    var remainingSeconds: Int {
+        let remaining = max(0, duration - currentTime)
+        return min(roundedDuration, Int(ceil(remaining)))
+    }
+
     private var player: AVAudioPlayer?
     private var timer: Timer?
     private var url: URL