Refactor: Move background image to main App composable and cleanup

This commit refactors the placement of the background image, moving it from `QuizScreen` to the main `KahootQuizApp` composable. This ensures the background is consistently applied across the app.

Additionally, this commit includes:
- Removal of unused Detekt configuration file (`ui/quiz/config/detekt/detekt.yml`).
- Minor code cleanup:
    - Removed commented-out code in `Theme.kt` and `Type.kt`.
    - Removed trailing blank lines in various domain model files.
    - Added `@file:Suppress("TooManyFunctions")` to `QuizMapper.kt`.
    - Added `@file:Suppress("MatchingDeclarationName")` to `QuizNavigation.kt`.
    - Used `1.seconds` instead of `1000` (Long) for delay in `QuizScreenViewModel`.

core/designsystem/src/main/kotlin/dev/adriankuta/kahootquiz/core/designsystem/TextUtils.kt

@@ -28,7 +28,8 @@ fun Spanned.toAnnotatedString(): AnnotatedString = buildAnnotatedString {
                         fontWeight = FontWeight.Bold,
                         fontStyle = FontStyle.Italic,
                     ),
-                    start, end,
+                    start,
+                    end,
                 )
             }
 
@@ -45,4 +46,4 @@ fun Spanned.toAnnotatedString(): AnnotatedString = buildAnnotatedString {
             )
         }
     }
-}
+}

core/designsystem/src/main/kotlin/dev/adriankuta/kahootquiz/core/designsystem/Theme.kt

@@ -20,16 +20,6 @@ private val LightColorScheme = lightColorScheme(
     primary = Purple40,
     secondary = PurpleGrey40,
     tertiary = Pink40,
-
-    /* Other default colors to override
-    background = Color(0xFFFFFBFE),
-    surface = Color(0xFFFFFBFE),
-    onPrimary = Color.White,
-    onSecondary = Color.White,
-    onTertiary = Color.White,
-    onBackground = Color(0xFF1C1B1F),
-    onSurface = Color(0xFF1C1B1F),
-    */
 )
 
 @Composable
@@ -54,4 +44,4 @@ fun KahootQuizTheme(
         typography = Typography,
         content = content,
     )
-}
+}

core/designsystem/src/main/kotlin/dev/adriankuta/kahootquiz/core/designsystem/Type.kt

@@ -15,20 +15,4 @@ val Typography = Typography(
         lineHeight = 24.sp,
         letterSpacing = 0.5.sp,
     ),
-    /* Other default text styles to override
-    titleLarge = TextStyle(
-        fontFamily = FontFamily.Default,
-        fontWeight = FontWeight.Normal,
-        fontSize = 22.sp,
-        lineHeight = 28.sp,
-        letterSpacing = 0.sp
-    ),
-    labelSmall = TextStyle(
-        fontFamily = FontFamily.Default,
-        fontWeight = FontWeight.Medium,
-        fontSize = 11.sp,
-        lineHeight = 16.sp,
-        letterSpacing = 0.5.sp
-    )
-    */
-)
+)