feat(#154): add word-by-word typing effect toggle and speed slider in settings (#165)

* feat(#154): add word-by-word typing effect toggle and speed slider in settings

* fix(settings): import Slider to fix build failure

---------

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

app/src/main/java/com/m57/hermescontrol/data/local/AuthManager.kt

@@ -24,10 +24,14 @@ object AuthManager {
     private const val KEY_AUTO_RECONNECT = "auto_reconnect"
     private const val KEY_THEME_PREFERENCE = "theme_preference"
     private const val KEY_BOTTOM_NAV_ITEMS = "bottom_nav_items"
+    private const val KEY_TYPING_EFFECT_ENABLED = "typing_effect_enabled"
+    private const val KEY_TYPING_EFFECT_DELAY_MS = "typing_effect_delay_ms"
 
     private const val DEFAULT_HOST = "127.0.0.1"
     private const val DEFAULT_PORT = 9119
     private const val DEFAULT_AUTO_RECONNECT = true
+    private const val DEFAULT_TYPING_EFFECT_ENABLED = false
+    private const val DEFAULT_TYPING_EFFECT_DELAY_MS = 30
 
     @Volatile
     private var prefs: SharedPreferences? = null
@@ -144,4 +148,20 @@ object AuthManager {
         requirePrefs().edit().putString(KEY_BOTTOM_NAV_ITEMS, items.joinToString(",")).apply()
         _bottomNavItemsFlow.value = items
     }
+
+    // ── Typing Effect ───────────────────────────────────────────────────
+
+    fun isTypingEffectEnabled(): Boolean =
+        requirePrefs().getBoolean(KEY_TYPING_EFFECT_ENABLED, DEFAULT_TYPING_EFFECT_ENABLED)
+
+    fun setTypingEffectEnabled(enabled: Boolean) {
+        requirePrefs().edit().putBoolean(KEY_TYPING_EFFECT_ENABLED, enabled).apply()
+    }
+
+    fun getTypingEffectDelayMs(): Int =
+        requirePrefs().getInt(KEY_TYPING_EFFECT_DELAY_MS, DEFAULT_TYPING_EFFECT_DELAY_MS)
+
+    fun setTypingEffectDelayMs(delayMs: Int) {
+        requirePrefs().edit().putInt(KEY_TYPING_EFFECT_DELAY_MS, delayMs).apply()
+    }
 }