fix: cancel stale progress notification on process start

Notifications belong to the package and outlive the process: after the
system kills the foreground service mid-download the frozen progress
notification stays in the shade forever. A fresh process means no
service is running, so any leftover notification is stale.

app/src/main/java/com/example/research/ReSearchApplication.kt

@@ -2,6 +2,7 @@ package com.example.research
 
 import android.app.Application
 import com.example.research.common.progress.DictionaryProgressStateHolder
+import com.example.research.common.util.NotificationHelper
 import com.example.research.data.local.preferences.PreferencesManager
 import com.example.research.data.repository.LocalDictionaryRepository
 import com.example.research.feature.download.DownloadManager
@@ -41,6 +42,8 @@ class ReSearchApplication : Application() {
     override fun onCreate() {
         super.onCreate()
 
+        NotificationHelper(this).cancelNotification()
+
         preferencesManager = PreferencesManager(this)
         applicationScope.launch(Dispatchers.IO) {
             preferencesManager.sanitizeDictionarySources()