v0.4.0-prebeta

New Features

• prefabs: remove VehicleObstacle from allowedObstaclePaths in background prefabs
• ui: add graphics settings with brightness overlay
• audio: apply SFX volume scaling to gameplay sounds
• audio: integrate audio settings with save system
• ui: update sound settings controller for three volume sliders
• ui: add Music and SFX sliders to sound settings panel
• audio: add AudioSettingsManager singleton for volume control
• audio: add AudioSettings domain model for persistence
• ui: add quit confirmation modal to pause menu
• shop: implement pagination logic for shop items
• ui: replace shop scrollbar with pagination navigation buttons
• build: auto-detect version from git tag for build path
• ui: add UI metadata for DifficultyChoice, WeaponAbilityChoice and LoadingScreen
• ui: add UIButtonSoundHandler for button audio feedback
• ui: add MainMenu button assets

Bug Fixes

• ui: add missing graphics-button-img CSS class
• ui: remove redundant SOUND title from sound panels
• ui: use AutoSaveMonoBehaviour singleton for reset functionality
• build: resolve Debug ambiguity with using alias

Improvements

• config: update MainMenu scene and LevelGenerator config
• ui: refresh GameOver title and MainMenu timeline assets
• ui: reorganize PauseMenu prefab into directory structure