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/Utils/SystemSettings.swift

@@ -0,0 +1,44 @@
+//
+// SystemSettings.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+#if os(iOS)
+import UIKit
+#elseif os(macOS)
+import AppKit
+#endif
+
+enum SystemSettings {
+    case bluetooth
+    case location
+    case microphone
+
+    #if os(macOS)
+    private static let baseURL = "x-apple.systempreferences:com.apple.preference.security"
+
+    private var macPrivacyAnchor: String {
+        switch self {
+        case .bluetooth: "Privacy_Bluetooth"
+        case .location: "Privacy_LocationServices"
+        case .microphone: "Privacy_Microphone"
+        }
+    }
+    #endif
+
+    func open() {
+        #if os(iOS)
+        if let url = URL(string: UIApplication.openSettingsURLString) {
+            UIApplication.shared.open(url)
+        }
+        #elseif os(macOS)
+        let urlString = "\(Self.baseURL)?\(macPrivacyAnchor)"
+        if let url = URL(string: urlString) {
+            NSWorkspace.shared.open(url)
+        }
+        #endif
+    }
+}