Expand Battle Tanks arena resolution and improve pickups/projectile visuals

[bashmohandes]

Motivation

• Make the Battle Tanks arena larger and more suitable for full-screen play so tanks have more travel distance and shots feel meaningful.
• Increase the visual fidelity and scale of power-up crates and projectile art so pickups and shots read better at higher resolutions.
• Keep gameplay balance by extending weapon ranges and terrain generation to match the larger world.

Description

• Increase the logical world resolution by changing WIDTH/HEIGHT to 1440×810 and bumping STATE_VERSION to 2 in battle-tanks/scripts/game.js so the canvas preserves additional travel space for full-screen displays.
• Scale arena generation and safe areas by updating ARENA_LIMITS, the terrain formula, and spawn-pad footprints (flattenPad) so pads, barrier, and terrain fit the expanded world.
• Enlarge crates by changing PICKUP_SIZE from 22 to 36 and update battle-tanks/scripts/app.js to render a larger, shaded crate with glow and an icon instead of the simple box.
• Improve projectile presentation in battle-tanks/scripts/app.js by replacing basic shapes with oriented sprites: exhaust trails, metallic gradients, highlights, and custom shapes for homing and heavy-shell projectiles, and expose PICKUP_SIZE from the core API.
• Extend weapon coverage to suit the larger arena by increasing homing acquisitionRange and laser ray.maxDistance in battle-tanks/scripts/game.js.
• Update battle-tanks/index.html canvas attributes to `width=

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Codex Task