feat: Implement QuizScreen and basic navigation structure

This commit introduces the `QuizScreen` composable, its associated `QuizScreenViewModel`, and sets up the basic navigation graph for the application.

Key changes:

- **UI Layer (`ui:quiz` module):**
    - Added `QuizScreen.kt` with a basic composable structure.
    - Implemented `QuizScreenViewModel.kt` which fetches quiz data using `GetQuizUseCase` and exposes it via `QuizUiState`.
    - Created `QuizUiState` data class to hold the quiz data for the UI.
    - Added `navigation/QuizNavigation.kt` to define the `QuizRoute` and `quizScreen` navigation extension.
    - Updated `ui/quiz/build.gradle.kts` to include dependencies for Hilt navigation and Timber.
- **App Module (`app` module):**
    - Created `KahootQuizApp.kt` which sets up the main `Scaffold` and includes the navigation graph.
    - Added `KahootQuizNavGraph.kt` to define the `NavHost` and integrate the `quizScreen`.
    - Modified `MainActivity.kt` to call the new `KahootQuizApp` composable, removing the previous direct use case call and UI.
- **Data Layer (`model:data` module):**
    - Updated `QuizMapper.kt` to convert `time` from `Long?` to `Duration?` (using `milliseconds`) when mapping `QuestionDto` to the domain `Question` model.

model/data/src/main/kotlin/dev/adriankuta/kahootquiz/model/data/mappers/QuizMapper.kt

@@ -2,6 +2,7 @@ package dev.adriankuta.kahootquiz.model.data.mappers
 
 import dev.adriankuta.kahootquiz.core.network.models.*
 import dev.adriankuta.kahootquiz.domain.models.*
+import kotlin.time.Duration.Companion.milliseconds
 
 internal fun QuizResponseDto.toDomainModel(): Quiz =
     Quiz(
@@ -110,7 +111,7 @@ private fun ChannelDto.toDomain(): Channel = Channel(id = id)
 private fun QuestionDto.toDomain(): Question = Question(
     type = type,
     question = question,
-    time = time,
+    time = time?.milliseconds,
     points = points,
     pointsMultiplier = pointsMultiplier,
     choices = choices?.map { it.toDomain() },