stronger haptics + live language switching

Haptics: all feedback stronger and more distinct —
- click (send): 1.0 intensity CLICK (was 0.85)
- thinkingStart: double-tap TICK 0.5→0.7 (was single 0.22)
- responseStart: three-step crescendo TICK→CLICK→CLICK (firmer)
- responseEnd: firm CLICK + settling TICK (was soft 0.3 TICK)

Language: selectLocale() now applies immediately —
- API 33+: LocaleManager.setApplicationLocales (no restart)
- API <33: updateConfiguration + activity.recreate()
No new dependencies needed.

app/src/main/java/dev/kaizen/app/haptics/Haptics.kt

@@ -36,47 +36,53 @@ class Haptics(private val vibrator: Vibrator?) {
         }
     }
 
-    /** Firmer click — send button. */
+    /** Firmer click — send button, satisfying "message sent" confirmation. */
     fun click() {
         val vib = active() ?: return
         if (supportsPrimitive(vib, VibrationEffect.Composition.PRIMITIVE_CLICK)) {
-            vib.composePrimitives(VibrationEffect.Composition.PRIMITIVE_CLICK to 0.85f)
+            vib.composePrimitives(VibrationEffect.Composition.PRIMITIVE_CLICK to 1.0f)
         } else {
             vib.predefinedOrOneShot(soft = false)
         }
     }
 
-    /** Very soft — the model received the prompt and starts thinking. */
+    /** Double-tap — the model received the prompt and starts thinking. */
     fun thinkingStart() {
-        val vib = active() ?: return
-        if (supportsPrimitive(vib, VibrationEffect.Composition.PRIMITIVE_TICK)) {
-            vib.composePrimitives(VibrationEffect.Composition.PRIMITIVE_TICK to 0.22f)
-        } else {
-            vib.predefinedOrOneShot(soft = true)
-        }
-    }
-
-    /** "The answer is arriving" — a three-step rising crescendo (the key moment). */
-    fun responseStart() {
         val vib = active() ?: return
         if (supportsPrimitive(vib, VibrationEffect.Composition.PRIMITIVE_TICK)) {
             vib.composePrimitives(
-                Triple(VibrationEffect.Composition.PRIMITIVE_TICK, 0.30f, 0),
+                Triple(VibrationEffect.Composition.PRIMITIVE_TICK, 0.5f, 0),
-                Triple(VibrationEffect.Composition.PRIMITIVE_TICK, 0.60f, 40),
+                Triple(VibrationEffect.Composition.PRIMITIVE_TICK, 0.7f, 60),
-                Triple(VibrationEffect.Composition.PRIMITIVE_TICK, 1.00f, 40),
             )
         } else {
             vib.predefinedOrOneShot(soft = false)
         }
     }
 
-    /** Gentle settle — stream finished. */
+    /** Rising crescendo — first token arrived, answer is streaming. */
+    fun responseStart() {
+        val vib = active() ?: return
+        if (supportsPrimitive(vib, VibrationEffect.Composition.PRIMITIVE_CLICK)) {
+            vib.composePrimitives(
+                Triple(VibrationEffect.Composition.PRIMITIVE_TICK, 0.4f, 0),
+                Triple(VibrationEffect.Composition.PRIMITIVE_CLICK, 0.7f, 50),
+                Triple(VibrationEffect.Composition.PRIMITIVE_CLICK, 1.0f, 50),
+            )
+        } else {
+            vib.predefinedOrOneShot(soft = false)
+        }
+    }
+
+    /** Firm settle — stream finished, answer complete. */
     fun responseEnd() {
         val vib = active() ?: return
-        if (supportsPrimitive(vib, VibrationEffect.Composition.PRIMITIVE_TICK)) {
+        if (supportsPrimitive(vib, VibrationEffect.Composition.PRIMITIVE_CLICK)) {
-            vib.composePrimitives(VibrationEffect.Composition.PRIMITIVE_TICK to 0.3f)
+            vib.composePrimitives(
+                Triple(VibrationEffect.Composition.PRIMITIVE_CLICK, 0.8f, 0),
+                Triple(VibrationEffect.Composition.PRIMITIVE_TICK, 0.4f, 80),
+            )
         } else {
-            vib.predefinedOrOneShot(soft = true)
+            vib.predefinedOrOneShot(soft = false)
         }
     }
 

app/src/main/java/dev/kaizen/app/settings/SettingsScreen.kt

@@ -45,6 +45,7 @@ import dev.kaizen.app.ui.theme.themes.KaizenThemeId
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.compose.ui.platform.LocalContext
 import dev.kaizen.app.chat.MeshBackground
 
 /**
@@ -129,7 +130,8 @@ fun SettingsScreen(
                 SettingsOptionRow(title = stringResource(R.string.settings_language_title), description = stringResource(R.string.settings_language_desc), icon = Icons.Rounded.Language) {
                     Row(horizontalArrangement = Arrangement.spacedBy(6.dp), verticalAlignment = Alignment.CenterVertically) {
                         listOf("system" to R.string.settings_language_system, "de" to R.string.settings_language_de, "en" to R.string.settings_language_en).forEach { (code, labelRes) ->
-                            AppearanceTogglePill(selected = locale == code, label = stringResource(labelRes), onClick = { viewModel.selectLocale(code) })
+                            val ctx = LocalContext.current
+                            AppearanceTogglePill(selected = locale == code, label = stringResource(labelRes), onClick = { viewModel.selectLocale(code, ctx as? android.app.Activity) })
                         }
                     }
                 }

app/src/main/java/dev/kaizen/app/settings/SettingsViewModel.kt

@@ -51,8 +51,22 @@ class SettingsViewModel(private val store: SecureStore? = null) : ViewModel() {
         _userEmail.value = email
     }
 
-    fun selectLocale(locale: String) {
+    fun selectLocale(locale: String, activity: android.app.Activity? = null) {
         _locale.value = locale
         store?.saveLocale(locale)
+        val localeList = if (locale == "system") {
+            android.os.LocaleList.getDefault()
+        } else {
+            android.os.LocaleList(java.util.Locale.forLanguageTag(locale))
+        }
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.TIRAMISU) {
+            activity?.getSystemService(android.app.LocaleManager::class.java)?.applicationLocales = localeList
+        } else {
+            val config = android.content.res.Configuration(activity?.resources?.configuration)
+            config.setLocales(localeList)
+            @Suppress("DEPRECATION")
+            activity?.resources?.updateConfiguration(config, activity.resources.displayMetrics)
+            activity?.recreate()
+        }
     }
 }