Implement Core Game Layout with Player Stats Panel

[frogr]

Acceptance Criteria

• Three-column layout (280px left, fluid center, 300px right)
• Player stats panel shows HP/AP/XP with animated progress bars
• SPECIAL attributes (S.P.E.C.I.A.L.) displayed in grid
• Stats update via ActionCable without page refresh
• Scanline CRT effect overlay

Technical Requirements

• Create app/views/layouts/game.html.erb
• Implement game_manager_controller.js Stimulus controller
• Style with CSS variables for theming
• HP bar uses red gradient, AP uses green, XP uses amber

Data Structure

Player model requires:

• hp, max_hp, ap, max_ap, xp, level
• strength, perception, endurance, charisma, intelligence, agility, luck
• caps, carry_weight, max_carry_weight, radiation