feat(quiz): Android Quiz UI — tab, code entry, questions, result (frontend 3/4)

[GerardPaligot]

Summary

Part 3 of 4 of the Quiz frontend feature. Adds the Android (Compose Multiplatform) Quiz UI on top of the shared core (#184) and the hasQuiz flag (#185).

• Quiz tab, gated on FeatureFlags.hasQuiz in MainNavigationViewModel (mirrors the hasNetworking/hasPartnerList gating). The nav graph is registered unconditionally so deep links keep working.
• Three screens (stateless panes + Koin ViewModels, StateFlow<UiState>):
  • Home / code entry — enter the partner code; prompts for a display name once (persisted), then registers the player. Shows the cumulative score (rank hidden).
  • Questions — single-select tappable answers; sticky submit enabled only when every question is answered.
  • Result — aggregate score + per-question feedback (correct/incorrect icon + the question text). Revisiting a completed quiz shows the saved result or an "already completed" state.
• 5 new feature modules under features/quiz/ (routes, ui, panes, presentation, di) mirroring the networking feature's convention plugins; reuses the design-system TopAppBar, Material3 Scaffold/Button/OutlinedTextField, SmallTag, SpacingTokens, ConfilyTheme.
• 9 ViewModel unit tests (Ktor-free, fake QuizRepository) covering load/select/submit, CodeNotFound, AlreadySubmitted, saved-result, already-completed, register delegation, cumulative score, and question-label resolution.

Scope

Part 3 of 4 (Android UI). iOS (SwiftUI) is the final PR. No backend changes.

Stacking

Stacked on #185 (hasQuiz flag) — base branch feat/quiz-hasquiz-flag. Auto-retargets as the stack merges.

Test Plan

• ./gradlew :features:quiz:quiz-presentation:desktopTest — 9 ViewModel tests pass
• ktlint + detekt clean on all new + edited modules
• ./gradlew :androidApp:assembleDebug — BUILD SUCCESSFUL; :androidApp:lintDebug — 0 errors
• Debug APK launches on emulator without crash
• Visual check of the tab requires a backend event with hasQuiz=true (not seedable locally)

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