feat: font scaler added

app/src/main/java/com/approagency/pharmacy/MainActivity.kt

@@ -12,8 +12,11 @@ import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.Density
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
 import com.approagency.pharmacy.data.local.SessionManager
@@ -52,8 +55,19 @@ class MainActivity : ComponentActivity(), OtpAutofillController {
         enableEdgeToEdge()
         setContent {
             val themeMode by session.themeMode.collectAsState()
+            val fontScale by session.fontScale.collectAsState()
             DrugTheme(themeMode = themeMode) {
-                AppNavGraph()
+                // مقیاسِ متنِ انتخابیِ کاربر روی fontScaleِ سیستم اعمال می‌شود
+                // تا کلِ متن‌های اپ یک‌جا بزرگ/کوچک شوند.
+                val density = LocalDensity.current
+                CompositionLocalProvider(
+                    LocalDensity provides Density(
+                        density = density.density,
+                        fontScale = density.fontScale * fontScale.scale
+                    )
+                ) {
+                    AppNavGraph()
+                }
             }
         }
     }

app/src/main/java/com/approagency/pharmacy/data/local/SessionManager.kt

@@ -2,6 +2,7 @@ package com.approagency.pharmacy.data.local
 
 import android.content.Context
 import android.content.SharedPreferences
+import com.approagency.pharmacy.domain.model.FontScale
 import com.approagency.pharmacy.domain.model.ThemeMode
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -128,6 +129,20 @@ class SessionManager(context: Context) {
         runCatching { ThemeMode.valueOf(prefs.getString(KEY_THEME_MODE, null) ?: ThemeMode.SYSTEM.name) }
             .getOrDefault(ThemeMode.SYSTEM)
 
+    // ---------- اندازهٔ متن ----------
+
+    private val _fontScale = MutableStateFlow(readFontScale())
+    val fontScale: StateFlow<FontScale> = _fontScale.asStateFlow()
+
+    fun setFontScale(scale: FontScale) {
+        prefs.edit().putString(KEY_FONT_SCALE, scale.name).apply()
+        _fontScale.value = scale
+    }
+
+    private fun readFontScale(): FontScale =
+        runCatching { FontScale.valueOf(prefs.getString(KEY_FONT_SCALE, null) ?: FontScale.NORMAL.name) }
+            .getOrDefault(FontScale.NORMAL)
+
     private fun readAccount() = AccountState(
         isLoggedIn = !token.isNullOrBlank(),
         mobile = prefs.getString(KEY_MOBILE, null),
@@ -147,5 +162,6 @@ class SessionManager(context: Context) {
         const val KEY_SUB_TITLE = "subscription_title"
         const val KEY_SUB_EXPIRE = "subscription_expire_at"
         const val KEY_THEME_MODE = "theme_mode"
+        const val KEY_FONT_SCALE = "font_scale"
     }
 }

app/src/main/java/com/approagency/pharmacy/domain/model/FontScale.kt

@@ -0,0 +1,11 @@
+package com.approagency.pharmacy.domain.model
+
+/**
+ * اندازهٔ متنِ انتخابیِ کاربر (به‌ویژه برای کاربرانِ مسن‌تر).
+ * [scale] ضریبی است که روی fontScaleِ دستگاه اعمال می‌شود.
+ */
+enum class FontScale(val scale: Float, val label: String) {
+    NORMAL(1.0f, "معمولی"),
+    LARGE(1.2f, "بزرگ"),
+    XLARGE(1.45f, "خیلی بزرگ")
+}

app/src/main/java/com/approagency/pharmacy/navigation/MainContainer.kt

@@ -39,6 +39,7 @@ fun MainContainer(
     val account by session.account.collectAsState()
     val sheetVisible by sheetController.visible.collectAsState()
     val themeMode by session.themeMode.collectAsState()
+    val fontScale by session.fontScale.collectAsState()
 
     val drawerState = rememberDrawerState(DrawerValue.Closed)
     val scope = rememberCoroutineScope()
@@ -59,6 +60,8 @@ fun MainContainer(
                 appVersion = appVersion,
                 themeMode = themeMode,
                 onThemeModeChange = { session.setThemeMode(it) },
+                fontScale = fontScale,
+                onFontScaleChange = { session.setFontScale(it) },
                 onLogout = { showLogoutConfirm = true }
             )
         }

app/src/main/java/com/approagency/pharmacy/presentation/account/AccountDrawer.kt

@@ -1,6 +1,8 @@
 package com.approagency.pharmacy.presentation.account
 
 import androidx.compose.foundation.background
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -43,6 +45,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.LayoutDirection
 import androidx.compose.ui.unit.dp
 import com.approagency.pharmacy.data.local.AccountState
+import com.approagency.pharmacy.domain.model.FontScale
 import com.approagency.pharmacy.domain.model.ThemeMode
 import com.vada.caller.ui.theme.dime
 
@@ -60,6 +63,8 @@ fun AccountDrawer(
     appVersion: String,
     themeMode: ThemeMode,
     onThemeModeChange: (ThemeMode) -> Unit,
+    fontScale: FontScale,
+    onFontScaleChange: (FontScale) -> Unit,
     onLogout: () -> Unit
 ) {
     ModalDrawerSheet(
@@ -71,6 +76,7 @@ fun AccountDrawer(
                 modifier = Modifier
                     .fillMaxHeight()
                     .fillMaxWidth()
+                    .verticalScroll(rememberScrollState())
                     .padding(horizontal = MaterialTheme.dime.lg, vertical = MaterialTheme.dime.xl)
             ) {
                 Header(account)
@@ -121,7 +127,18 @@ fun AccountDrawer(
                 Spacer(Modifier.height(MaterialTheme.dime.sm))
                 ThemeModeSelector(selected = themeMode, onSelect = onThemeModeChange)
 
-                Spacer(Modifier.weight(1f))
+                Spacer(Modifier.height(MaterialTheme.dime.lg))
+
+                // اندازهٔ متن (برای کاربرانِ مسن‌تر)
+                Text(
+                    text = "اندازهٔ متن",
+                    style = MaterialTheme.typography.titleSmall,
+                    fontWeight = FontWeight.Bold
+                )
+                Spacer(Modifier.height(MaterialTheme.dime.sm))
+                FontScaleSelector(selected = fontScale, onSelect = onFontScaleChange)
+
+                Spacer(Modifier.height(MaterialTheme.dime.xl))
 
                 if (account.isLoggedIn) {
                     OutlinedButton(
@@ -267,3 +284,23 @@ private fun ThemeModeSelector(
         }
     }
 }
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun FontScaleSelector(
+    selected: FontScale,
+    onSelect: (FontScale) -> Unit
+) {
+    val options = FontScale.entries
+    SingleChoiceSegmentedButtonRow(modifier = Modifier.fillMaxWidth()) {
+        options.forEachIndexed { index, option ->
+            SegmentedButton(
+                selected = selected == option,
+                onClick = { onSelect(option) },
+                shape = SegmentedButtonDefaults.itemShape(index, options.size),
+                icon = {},
+                label = { Text(option.label, style = MaterialTheme.typography.labelSmall) }
+            )
+        }
+    }
+}