Remove dead code across utils and designsystem (#43)

- Drop shareImage / toUriCompat / isAlphanumeric from Utility (no
  production callers; deletes the matching tests)
- Drop cardTimeAgoInWordsDateString from DateUtility (unused, was the
  only consumer of android.text.format.DateUtils)
- Delete Tint.kt (TintTheme / LocalTintTheme) — provided by NatTheme
  but never read anywhere
- Drop successContainer / onSuccessContainer from CustomColorScheme
  and the now-orphaned Teal10 / Teal30 / Teal90 color tokens

Net: 7 files touched, 110 lines deleted. No production behavior changes.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dadachi

app/src/main/kotlin/com/nativeapptemplate/nativeapptemplatefree/designsystem/theme/Color.kt

@@ -33,12 +33,9 @@ internal val Red20 = Color(0xFF690005)
 internal val Red30 = Color(0xFF93000A)
 internal val Red40 = Color(0xFFBA1A1A)
 internal val Red90 = Color(0xFFFFDAD6)
-internal val Teal10 = Color(0xFF014D40)
 internal val Teal20 = Color(0xFF0C6B58)
-internal val Teal30 = Color(0xFF147D64)
 internal val Teal40 = Color(0xFF199473)
 internal val Teal80 = Color(0xFF8EEDC7)
-internal val Teal90 = Color(0xFFC6F7E2)
 
 internal val Yellow10 = Color(0xFF8D2B0B)
 internal val Yellow20 = Color(0xFFB44D12)

app/src/main/kotlin/com/nativeapptemplate/nativeapptemplatefree/designsystem/theme/CustomColorScheme.kt

@@ -8,22 +8,16 @@ import androidx.compose.ui.graphics.Color
 data class CustomColorScheme(
   val success: Color = Color.Unspecified,
   val onSuccess: Color = Color.Unspecified,
-  val successContainer: Color = Color.Unspecified,
-  val onSuccessContainer: Color = Color.Unspecified,
 )
 
 val LightCustomColorScheme = CustomColorScheme(
   success = Teal40,
   onSuccess = Color.White,
-  successContainer = Teal90,
-  onSuccessContainer = Teal10,
 )
 
 val DarkCustomColorScheme = CustomColorScheme(
   success = Teal80,
   onSuccess = Teal20,
-  successContainer = Teal30,
-  onSuccessContainer = Teal90,
 )
 
 val LocalCustomColorScheme = staticCompositionLocalOf { CustomColorScheme() }

app/src/main/kotlin/com/nativeapptemplate/nativeapptemplatefree/designsystem/theme/Theme.kt

@@ -77,8 +77,6 @@ fun NatTheme(
     tonalElevation = 2.dp,
   )
 
-  val tintTheme = TintTheme()
-
   val customColorsPalette =
     if (darkTheme) {
       DarkCustomColorScheme
@@ -90,7 +88,6 @@ fun NatTheme(
   CompositionLocalProvider(
     LocalCustomColorScheme provides customColorsPalette,
     LocalBackgroundTheme provides backgroundTheme,
-    LocalTintTheme provides tintTheme,
   ) {
     MaterialTheme(
       colorScheme = colorScheme,

app/src/main/kotlin/com/nativeapptemplate/nativeapptemplatefree/designsystem/theme/Tint.kt

@@ -1,6 +1,5 @@
 package com.nativeapptemplate.nativeapptemplatefree.utils
 
-import android.text.format.DateUtils
 import java.time.ZoneId
 import java.time.ZonedDateTime
 
@@ -39,15 +38,4 @@ object DateUtility {
     val date = ZonedDateTime.parse(this).withZoneSameInstant(zoneId)
     return date.cardDateTimeString()
   }
-
-  fun ZonedDateTime.cardTimeAgoInWordsDateString(): String {
-    return DateUtils.getRelativeTimeSpanString(this.toInstant().toEpochMilli(), System.currentTimeMillis(), DateUtils.MINUTE_IN_MILLIS).toString()
-  }
-
-  fun String.cardTimeAgoInWordsDateString(zoneId: ZoneId = ZoneId.systemDefault()): String {
-    if (this.isBlank()) return ""
-
-    val date = ZonedDateTime.parse(this).withZoneSameInstant(zoneId)
-    return date.cardTimeAgoInWordsDateString()
-  }
 }

app/src/main/kotlin/com/nativeapptemplate/nativeapptemplatefree/utils/DateUtility.kt

@@ -3,18 +3,12 @@ package com.nativeapptemplate.nativeapptemplatefree.utils
 import android.content.Context
 import android.content.ContextWrapper
 import android.content.Intent
-import android.graphics.Bitmap
 import android.net.Uri
 import android.os.Build
 import androidx.activity.ComponentActivity
-import androidx.compose.ui.graphics.ImageBitmap
-import androidx.compose.ui.graphics.asAndroidBitmap
-import androidx.core.content.FileProvider
 import com.nativeapptemplate.nativeapptemplatefree.BuildConfig
 import com.nativeapptemplate.nativeapptemplatefree.NatConstants
 import com.nativeapptemplate.nativeapptemplatefree.R
-import java.io.File
-import java.io.FileOutputStream
 import java.util.Locale
 
 object Utility {
@@ -28,12 +22,6 @@ object Utility {
     else -> null
   }
 
-  fun isAlphanumeric(text: String?): Boolean {
-    if (text.isNullOrBlank()) return false
-
-    return text.matches("^[a-zA-Z0-9]*$".toRegex())
-  }
-
   fun marketUri(): Uri {
     val appId = BuildConfig.APPLICATION_ID
     return Uri.parse("market://details?id=$appId")
@@ -44,30 +32,6 @@ object Utility {
     return Uri.parse("https://play.google.com/store/apps/details?id=$appId")
   }
 
-  // https://stackoverflow.com/a/75714502/1160200
-  // https://qiita.com/irgaly/items/b942bd985a4647e372ea
-  fun Context.shareImage(title: String, image: ImageBitmap, filename: String) {
-    val file = File(cacheDir, "$filename.png").also { outputFile ->
-      FileOutputStream(outputFile).use { outputStream ->
-        image.asAndroidBitmap().compress(Bitmap.CompressFormat.PNG, 100, outputStream)
-      }
-    }
-
-    val uri = file.toUriCompat(this)
-
-    val shareIntent = Intent().apply {
-      action = Intent.ACTION_SEND
-      type = "image/png"
-      addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-      putExtra(Intent.EXTRA_STREAM, uri)
-    }
-    startActivity(Intent.createChooser(shareIntent, title))
-  }
-
-  private fun File.toUriCompat(context: Context): Uri {
-    return FileProvider.getUriForFile(context, context.packageName + ".fileprovider", this)
-  }
-
   // https://stackoverflow.com/a/78039163/1160200
   fun Context.restartApp() {
     val packageManager = packageManager

app/src/main/kotlin/com/nativeapptemplate/nativeapptemplatefree/utils/Utility.kt

@@ -31,36 +31,4 @@ class UtilityTest {
   fun validateEmail_noDomain_returnsFalse() {
     assertFalse("test@".validateEmail())
   }
-
-  // isAlphanumeric tests
-
-  @Test
-  fun isAlphanumeric_alphanumericText_returnsTrue() {
-    assertTrue(Utility.isAlphanumeric("abc123"))
-  }
-
-  @Test
-  fun isAlphanumeric_lettersOnly_returnsTrue() {
-    assertTrue(Utility.isAlphanumeric("abcdef"))
-  }
-
-  @Test
-  fun isAlphanumeric_numbersOnly_returnsTrue() {
-    assertTrue(Utility.isAlphanumeric("123456"))
-  }
-
-  @Test
-  fun isAlphanumeric_specialChars_returnsFalse() {
-    assertFalse(Utility.isAlphanumeric("abc!@#"))
-  }
-
-  @Test
-  fun isAlphanumeric_null_returnsFalse() {
-    assertFalse(Utility.isAlphanumeric(null))
-  }
-
-  @Test
-  fun isAlphanumeric_blank_returnsFalse() {
-    assertFalse(Utility.isAlphanumeric(""))
-  }
 }