@@ -2,6 +2,18 @@
 
 Newest version first. A version's section becomes the release notes on GitHub.
 
+## 1.5.0 — 2026-10-11
+
+- Tenshi-chan is the angel again: sky-blue hair, a halo and feathered wings, now with a red ribbon. Tap her and
+  she tilts her head, closes her eyes and smiles. The app icon is back too.
+- The target range is typed in: two fields in the chosen unit and a "Save" button that only works for a range
+  that makes sense. The saved range is shown on its own line.
+- Calmer screens: no more address bar at the top (the theme and the language are in Settings), no window
+  buttons, and the background no longer moves: no bubbles, stars or hearts, only the still field of dots.
+- The "Now" tab has a house icon.
+- Fixed: changing the language made the whole screen flash black. The screen now stays and its texts switch
+  to the new language in place.
+
 ## 1.4.0 — 2026-10-11
 
 - A new look after keril.art: a blue sky with dots, bubbles, stars and hearts, Windows XP style windows
 
@@ -28,13 +28,14 @@ from the LibreLinkUp cloud and writes them to Health Connect, where Samsung Heal
 - **Estimated HbA1c (GMI)** for 14 and 90 days, from all the history SugarBridge has written to Health Connect.
 - **Its own chart and statistics** for 12 hours, mmol/L or mg/dL, your own target range. Tap the chart to open it
   full screen and move a finger along it to read every value and its time.
-- **Light and dark theme** in the style of [keril.art](https://keril.art/): a blue sky with bubbles and stars,
-  Windows XP style windows and a pixel font. The phone's theme by default; the sun/moon button switches it.
+- **Light and dark theme** in the style of [keril.art](https://keril.art/): a blue sky with a field of dots,
+  Windows XP style windows and a pixel font. The phone's theme by default, or light or dark in Settings.
 - **12 languages**: English, Русский, Українська, Deutsch, Français, Español, Português, Italiano, Türkçe,
   简体中文, 日本語, 한국어. Chosen on the first start, changeable in Settings or in Android's per-app language settings.
 - **The password is protected by the Android Keystore** and stays on the phone.
 - **Updates in the app**: SugarBridge finds a new version on GitHub, downloads it and hands it to Android to install.
-- **Tenshi-chan**, an ice-fairy chibi mascot who is happy, worried, flustered or sleepy depending on your glucose.
+- **Tenshi-chan**, a chibi angel mascot who is happy, worried, flustered or sleepy depending on your glucose.
+  Tap her and she tilts her head, closes her eyes and smiles.
 
 Data path: sensor → LibreLink on the phone → LibreLinkUp cloud → SugarBridge → Health Connect → Samsung Health.
 
@@ -198,14 +199,14 @@ GitHub Actions builds and signs the APK in Releases when a `v*` tag arrives in t
    ```
 3. **Every release:** add the version's section to [CHANGELOG.md](CHANGELOG.md), then
    ```sh
-   git tag v1.4.0
-   git push origin v1.4.0
+   git tag v1.5.0
+   git push origin v1.5.0
    ```
    A few minutes later `SugarBridge.apk` appears in Releases with the notes from the CHANGELOG.
 
 A signed APK can be built locally too: put `sugarbridge.keystore`, `sugarbridge.keystorePassword`,
 `sugarbridge.keyAlias` and `sugarbridge.keyPassword` into `~/.gradle/gradle.properties` (outside the repository)
-and run `./gradlew assembleRelease -Psugarbridge.version=1.4.0`.
+and run `./gradlew assembleRelease -Psugarbridge.version=1.5.0`.
 
 ## Thanks
 
 
@@ -28,14 +28,15 @@
 - **Расчётный HbA1c (GMI)** за 14 и 90 дней — по всей истории, которую SugarBridge записал в Health Connect.
 - **Свой график и статистика** за 12 часов, ммоль/л или мг/дл, свой целевой диапазон. Нажмите на график —
   он откроется на весь экран, а пальцем по нему видно каждое значение и его время.
-- **Светлая и тёмная тема** в стиле [keril.art](https://keril.art/): голубое небо с пузырьками и звёздами,
-  окна в духе Windows XP и пиксельный шрифт. По умолчанию — как на телефоне, кнопка с солнцем/луной переключает.
+- **Светлая и тёмная тема** в стиле [keril.art](https://keril.art/): голубое небо в точку, окна в духе
+  Windows XP и пиксельный шрифт. По умолчанию — как на телефоне, в настройках можно выбрать светлую или тёмную.
 - **12 языков**: English, Русский, Українська, Deutsch, Français, Español, Português, Italiano, Türkçe,
   简体中文, 日本語, 한국어. Язык выбирается при первом запуске, поменять его можно в настройках приложения
   или в системных настройках языка приложений.
 - **Пароль под защитой Android Keystore**, хранится только на телефоне.
 - **Обновления прямо в приложении**: SugarBridge находит новую версию на GitHub, скачивает её и передаёт Android на установку.
-- **Тэнси-тян** — ледяная фея в стиле чиби: радуется, волнуется, смущается или спит в зависимости от сахара.
+- **Тэнси-тян** — ангелочек в стиле чиби: радуется, волнуется, смущается или спит в зависимости от сахара.
+  Если на неё нажать, она наклонит голову, зажмурится и улыбнётся.
 
 Путь данных: датчик → LibreLink на телефоне → облако LibreLinkUp → SugarBridge → Health Connect →
 Samsung Health.
@@ -204,14 +205,14 @@ APK в Releases собирает и подписывает GitHub Actions, ко
    ```
 3. **Каждый выпуск:** допишите раздел версии в [CHANGELOG.md](CHANGELOG.md) (на английском), затем
    ```sh
-   git tag v1.4.0
-   git push origin v1.4.0
+   git tag v1.5.0
+   git push origin v1.5.0
    ```
    Через несколько минут в Releases появится `SugarBridge.apk` с описанием из CHANGELOG.
 
 Подписанный APK можно собрать и у себя: пропишите в `~/.gradle/gradle.properties` (вне репозитория)
 `sugarbridge.keystore`, `sugarbridge.keystorePassword`, `sugarbridge.keyAlias`, `sugarbridge.keyPassword`
-и запустите `./gradlew assembleRelease -Psugarbridge.version=1.4.0`.
+и запустите `./gradlew assembleRelease -Psugarbridge.version=1.5.0`.
 
 ## Благодарности
 
 
@@ -3,9 +3,9 @@ plugins {
     alias(libs.plugins.kotlin.compose)
 }
 
-// The version: a release takes it from the git tag (./gradlew -Psugarbridge.version=1.4.0), otherwise this one.
+// The version: a release takes it from the git tag (./gradlew -Psugarbridge.version=1.5.0), otherwise this one.
 // versionCode grows with it: 1.2.3 → 10203.
-val appVersion = providers.gradleProperty("sugarbridge.version").getOrElse("1.4.0")
+val appVersion = providers.gradleProperty("sugarbridge.version").getOrElse("1.5.0")
 val appVersionCode = (appVersion.substringBefore('-').split('.').map { it.toIntOrNull() ?: 0 } + listOf(0, 0, 0))
     .take(3)
     .let { (major, minor, patch) -> major * 10_000 + minor * 100 + patch }
 
@@ -0,0 +1,52 @@
+package com.sugarbridge.app.ui
+
+import androidx.compose.ui.test.junit4.createEmptyComposeRule
+import androidx.compose.ui.test.onNodeWithText
+import androidx.test.core.app.ActivityScenario
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import com.sugarbridge.app.MainActivity
+import com.sugarbridge.app.R
+import com.sugarbridge.app.libre.Libre
+import com.sugarbridge.app.resourcesIn
+import com.sugarbridge.app.settings.SettingsStore
+import com.sugarbridge.app.useAppLanguage
+import org.junit.After
+import org.junit.Assert.assertSame
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Switching the language must not restart the screen: a restart is what made the whole screen flash black.
+ * The same Activity stays and only redraws its texts in the new language.
+ */
+@RunWith(AndroidJUnit4::class)
+class LanguageSwitchTest {
+
+    @get:Rule
+    val compose = createEmptyComposeRule()
+
+    private val context = InstrumentationRegistry.getInstrumentation().targetContext
+
+    @After
+    fun cleanUp() = useAppLanguage(context, null)
+
+    @Test
+    fun languageChangesWithoutRestartingTheScreen() {
+        Libre.signOut(context)
+        SettingsStore(context).languageChosen = true   // the sign-in screen
+        useAppLanguage(context, "en")
+        val scenario = ActivityScenario.launch(MainActivity::class.java)
+        compose.onNodeWithText(resourcesIn(context, "en").getString(R.string.login_title)).assertExists()
+        lateinit var before: MainActivity
+        scenario.onActivity { before = it }
+
+        useAppLanguage(context, "de")
+        compose.waitUntil(5_000) {
+            runCatching { compose.onNodeWithText(resourcesIn(context, "de").getString(R.string.login_title)).assertExists() }.isSuccess
+        }
+        scenario.onActivity { assertSame("the screen was restarted", before, it) }
+        scenario.close()
+    }
+}
@@ -4,7 +4,10 @@ import android.graphics.Bitmap
 import androidx.compose.ui.test.junit4.createEmptyComposeRule
 import androidx.compose.ui.test.onNodeWithText
 import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.test.hasSetTextAction
+import androidx.compose.ui.test.hasText
 import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.performTextReplacement
 import androidx.compose.ui.test.performClick
 import androidx.compose.ui.test.performTouchInput
 import androidx.test.espresso.Espresso
@@ -16,7 +19,10 @@ import androidx.test.platform.app.InstrumentationRegistry
 import com.sugarbridge.app.MainActivity
 import com.sugarbridge.app.MainViewModel
 import com.sugarbridge.app.R
+import com.sugarbridge.app.glucose.GlucoseUnit
+import com.sugarbridge.app.glucose.MGDL_PER_MMOL
 import com.sugarbridge.app.glucose.Reading
+import com.sugarbridge.app.glucose.formatGlucose
 import com.sugarbridge.app.health.HealthConnectState
 import com.sugarbridge.app.health.WRITE_GLUCOSE
 import com.sugarbridge.app.health.deleteOwnGlucose
@@ -44,6 +50,7 @@ import java.time.LocalDate
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 import java.util.Locale
+import kotlin.math.abs
 import kotlin.math.exp
 import kotlin.math.sin
 import kotlinx.coroutines.runBlocking
@@ -149,6 +156,8 @@ class ScreenshotTest {
         compose.waitUntil(10_000) { vm.ui.signedIn && vm.ui.canWrite != null }
         compose.onNodeWithText(text(R.string.tab_now)).assertExists()   // the screen really is in this language
         shot(language, "home")
+        compose.onNodeWithTag("mascot").performClick()   // she tilts her head, closes her eyes and smiles
+        shot(language, "home_tap")
         compose.waitUntil(20_000) { vm.ui.gmi14 != null }
         compose.onNodeWithText(res.getString(R.string.gmi_hint, 70)).performScrollTo()
         shot(language, "home_gmi")
@@ -176,6 +185,13 @@ class ScreenshotTest {
         compose.onNodeWithText(text(R.string.settings_about_title)).performScrollTo()
         shot(language, "settings_bottom")
 
+        // the target range is typed in: a new lower bound with the decimal separator of the language, then Save
+        val locale = Locale.forLanguageTag(language)
+        compose.onNode(hasSetTextAction() and hasText(formatGlucose(70.0, GlucoseUnit.MMOL, locale))).performTextReplacement(String.format(locale, "%.1f", 4.2))
+        compose.onNodeWithText(text(R.string.target_save)).performClick()
+        compose.waitUntil(5_000) { abs(vm.ui.settings.lowMgDl - 4.2 * MGDL_PER_MMOL) < 0.1 }
+        scenario.onActivity { vm.updateSettings { it.copy(lowMgDl = 70.0) } }
+
         compose.onNodeWithText(text(R.string.tab_now)).performClick()
         scenario.onActivity { vm.updateSettings { it.copy(theme = ThemeMode.DARK) } }   // the sun/moon switch
         shot(language, "home_night")
 
@@ -27,8 +27,10 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.SugarBridge">
+        <!-- a language change is handled in place: no restart, so the screen doesn't flash black -->
         <activity
             android:name=".MainActivity"
+            android:configChanges="locale|layoutDirection"
             android:exported="true"
             android:launchMode="singleTop"
             android:theme="@style/Theme.SugarBridge"
 
@@ -6,6 +6,7 @@ import android.content.ActivityNotFoundException
 import android.content.Intent
 import android.content.pm.PackageInstaller
 import android.content.pm.PackageManager
+import android.content.res.Configuration
 import android.graphics.Color
 import android.net.Uri
 import android.os.Bundle
@@ -64,7 +65,7 @@ class MainActivity : ComponentActivity(), AppActions {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
-        createNotificationChannels(this)   // also renames the channels after a language change
+        createNotificationChannels(this)
         scheduleSync(this)   // safe to call on every start
         if (savedInstanceState == null) handleIntent(intent)
         setContent {
@@ -80,6 +81,15 @@ class MainActivity : ComponentActivity(), AppActions {
         }
     }
 
+    /**
+     * The app language changed. The screen stays (see configChanges in the manifest) and Compose redraws
+     * every text in the new language; only the notification channels need their new names.
+     */
+    override fun onConfigurationChanged(newConfig: Configuration) {
+        super.onConfigurationChanged(newConfig)
+        createNotificationChannels(this)
+    }
+
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
         handleIntent(intent)
@@ -121,7 +131,7 @@ class MainActivity : ComponentActivity(), AppActions {
         }
     }
 
-    /** null follows the phone. If the language really changes, Android recreates this screen in it. */
+    /** null follows the phone. The screen redraws in the new language in place (see onConfigurationChanged). */
     override fun setLanguage(tag: String?) {
         vm.languageChosen()
         setAppLanguage(this, tag)
 
@@ -35,7 +35,6 @@ import com.sugarbridge.app.libreview.readingsOnDays
 import com.sugarbridge.app.libreview.summarizeDays
 import com.sugarbridge.app.settings.AppSettings
 import com.sugarbridge.app.settings.SettingsStore
-import com.sugarbridge.app.settings.ThemeMode
 import com.sugarbridge.app.sync.LiveSyncService
 import com.sugarbridge.app.sync.Problem
 import com.sugarbridge.app.sync.SyncBlocked
@@ -254,9 +253,6 @@ class MainViewModel(app: Application) : AndroidViewModel(app) {
     /** What Android's installer answered, for the Activity. */
     fun updateFailed(message: String) = say(R.string.update_failed, message)
 
-    /** The sun/moon button: switch to the opposite of what is on screen now. */
-    fun toggleTheme(nightNow: Boolean) = updateSettings { it.copy(theme = if (nightNow) ThemeMode.LIGHT else ThemeMode.DARK) }
-
     /**
      * Estimated HbA1c (GMI) for 14 and 90 days from all SugarBridge readings in Health Connect, in one pass
      * over 90 days of records. Recalculated at most every 10 minutes: it barely changes in that time.
 
@@ -0,0 +1,22 @@
+package com.sugarbridge.app.glucose
+
+// What a target range may be: Libre measures 40–500 mg/dL, and a range narrower than 0.5 mmol/L makes no sense
+const val TARGET_MIN_MGDL = 40.0
+const val TARGET_MAX_MGDL = 400.0
+const val TARGET_MIN_WIDTH_MGDL = 9.0
+
+/** A typed glucose value ("3,9", "3.9", " 70 ") in the given unit, as mg/dL; null if it isn't a number. */
+fun parseGlucose(text: String, unit: GlucoseUnit): Double? {
+    val number = text.trim().replace(',', '.').toDoubleOrNull() ?: return null
+    if (number.isNaN() || number.isInfinite()) return null
+    return when (unit) {
+        GlucoseUnit.MMOL -> number * MGDL_PER_MMOL
+        GlucoseUnit.MGDL -> number
+    }
+}
+
+/** true when both bounds are set, the lower one comes first and both lie within what makes sense. */
+fun isValidTarget(lowMgDl: Double?, highMgDl: Double?): Boolean =
+    lowMgDl != null && highMgDl != null &&
+        lowMgDl >= TARGET_MIN_MGDL - 0.5 && highMgDl <= TARGET_MAX_MGDL + 0.5 &&
+        highMgDl - lowMgDl >= TARGET_MIN_WIDTH_MGDL - 0.5