Add Driving Game mode

[datnguyen1]

Overview

Adds a new Driving Game mode: a 3‑lane top‑down mini‑game rendered in Ratatui that runs independently of audio playback. The player drives a car across three lanes, dodges incoming cars, and fires projectiles straight up to destroy them. Game logic runs on a fixed timestep; audio playback (Rodio/Symphonia) remains non‑blocking and continues in the background by default.

Controls

• W/S: move up/down
• A/D: move left/right between 3 lanes
• Space: fire projectile upward
• P: pause/resume
• Esc or Q: exit game back to main UI
• R: restart on Game Over
• M: toggle music during game (default: on)

Mechanics

• Player starts with 3 lives; collision with an enemy reduces life and triggers ~1s invulnerability frames.
• Enemies spawn at the top with a probability that increases over time; downward speed slightly accelerates.
• Projectiles destroy the first enemy hit in their lane; +100 score each.
• Enemies that reach the bottom are removed (no penalty beyond missed score).
• Game over when lives reach 0; overlay appears with score and restart/exit options.

Architecture

• New module tree under src/game/:
  • scene.rs: GameScene enum (Running, Paused, GameOver)
  • entities.rs: Player, Enemy, Projectile
  • state.rs: GameState (lanes, player, enemies, projectiles, score, lives, rng, timers)
  • input.rs: key mapping to GameCmd
  • spawn.rs: enemy spawn logic and difficulty curve
  • update.rs: per‑tick movement, collisions, cleanup
  • draw.rs: rendering of borders, lanes, cars, projectiles, HUD
• Integration:
  • AppMode::DrivingGame in src/screen/main_loop.rs
  • Fixed timestep loop (~33ms) with accumulator; render each tick
  • Input routed to game mapping when in game mode; jukebox controls untouched otherwise
  • Audio playback independent and non‑blocking; optional in‑game toggle (M)

Acceptance Criteria

• New menu/control entry to start “Driving Game” (g) starts gameplay without crashing
• Left/right borders and three vertical lanes rendered; player moves with WASD within bounds
• Enemies spawn and move down; collisions reduce lives with invulnerability frames
• Space fires projectiles that destroy enemies and award score
• Pause works; Esc/Q returns to main UI; Game Over screen shows score and allows restart
• Works in at least 80x24; degrades gracefully on smaller sizes
• No regressions to existing MP3 playback; game runs even without a loaded track

Demo

• Screenshot available as screenshot.png in repo.
• (Optional) A short GIF can be added in a follow‑up.

README

See the new section: Driving Game Mode.

Notes

• Render uses ASCII with safe ANSI colors; avoids Unicode assumptions
• Basic test included for lane math monotonicity in state.rs

Commits

Key commits in this branch include module scaffolding, integration, and fixed‑timestep/input/draw wiring. See commit history in this PR for details.

[Navtej968]

Epic pull

[fdciabdul]

i wanna see the demo or preview for this one

[ItsmeTyronLacandulaX]

Would love to see more

[22samurai]

Imagine a Vib-ribbon style level-generation based on the music... #nextsteps