test(#291): add coverage for 3 critical untested components (#300)

* test(#291): add coverage for 3 critical untested components

- NavigationController dedup guard (line 45): 14 pure unit tests for
  navigateTo, resetTo, goBack, primary-screen clearing, and null guards.
- NotificationReplyReceiver: 11 MockK-based tests covering the full
  WS+Room+notification flow: valid reply sends WS message, persists to
  Room with correct entity shape, shows replied confirmation notification,
  finishes PendingResult, and gracefully handles null/blank inputs and
  Room failures.
- ChatNotificationService isAppInForeground flag: 5 tests verifying
  companion object toggle, volatile modifier (thread safety), default
  false state, and idempotent calls.
- Fix: add @Volatile to isAppInForeground (was a plain var read from
  background coroutine and written from UI thread)

Closes #291

* fix(#291): fix MockK type errors in test compilation

* fix(#291): fix test assertions and goAsync mock for CI

* fix(#291): wrap final BroadcastReceiver.goAsync() with open Kotlin wrapper

* chore: trigger CI on latest fix commit

* fix(#291): make NotificationReplyReceiver open so tests can subclass it

* fix(#291): extract buildReplyNotification() to avoid 'not mocked' framework error

NotificationCompat.Builder.build() internally calls android.app.Notification.Builder
methods (e.g. setWhen) that throw RuntimeException with 'Method setWhen in
android.app.Notification.Builder not mocked' in unit tests — the standard Android
unit test environment does not provide real framework implementations.

Extracting notification creation into an open method (same pattern as goAsyncCompat())
lets tests override it to return a mock Notification, avoiding the framework call
entirely.

* style: fix ktlint blank-line-before-declaration in test

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/notification/ChatNotificationService.kt

@@ -57,6 +57,7 @@ class ChatNotificationService : Service() {
         internal const val NOTIFICATION_ID = 1
         internal const val PENDING_NOTIFICATION_ID = 2
 
+        @Volatile
         private var isAppInForeground = false
 
         fun setAppForeground(foreground: Boolean) {