Extract BLE and chat architecture policies (#1324)

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

bitchatTests/ChatBluetoothAlertPolicyTests.swift

@@ -0,0 +1,40 @@
+import CoreBluetooth
+import Testing
+@testable import bitchat
+
+struct ChatBluetoothAlertPolicyTests {
+    @Test
+    func poweredOffShowsAlertMessage() {
+        let update = ChatBluetoothAlertPolicy.update(for: .poweredOff)
+
+        #expect(update.isPresented)
+        #expect(update.message?.isEmpty == false)
+    }
+
+    @Test
+    func unauthorizedShowsAlertMessage() {
+        let update = ChatBluetoothAlertPolicy.update(for: .unauthorized)
+
+        #expect(update.isPresented)
+        #expect(update.message?.isEmpty == false)
+    }
+
+    @Test
+    func poweredOnHidesAndClearsAlertMessage() {
+        let update = ChatBluetoothAlertPolicy.update(for: .poweredOn)
+
+        #expect(!update.isPresented)
+        #expect(update.message == "")
+    }
+
+    @Test
+    func transientStatesHideWithoutChangingAlertMessage() {
+        let unknown = ChatBluetoothAlertPolicy.update(for: .unknown)
+        let resetting = ChatBluetoothAlertPolicy.update(for: .resetting)
+
+        #expect(!unknown.isPresented)
+        #expect(unknown.message == nil)
+        #expect(!resetting.isPresented)
+        #expect(resetting.message == nil)
+    }
+}