[18ESP] adds simple logos

[philcampeau]

Before clicking "Create"

• Branch is derived from the latest master
• Add the pins or archive_alpha_games label if this change will break existing games
• Code passes linter with docker compose exec rack rubocop -a
• Tests pass cleanly with docker compose exec rack rake

Implementation Notes

Explanation of Change

Adds Simple Logos created with the generate_logos.rb script.

Screenshots

Any Assumptions / Hacks

[perwestling]

Reviewed with AI assistance by Mistral Vibe

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✅ Strengths

• Adds simple (alternative) logos for 18_esp corporations
• Uses correct naming convention: {BASE}.alt.svg (e.g., 18_esp/A.alt.svg)
• Files stored in correct location: public/logos/18_esp/
• Uses generate_logos.rb script for consistency
• Improves accessibility for players with vision difficulties
• All other logos look fine

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⚠️ Requested Changes

• Fix text color contrast for logos with light backgrounds: MH (pink), CA (light yellow), SC (bright yellow)
• Suggestion: Regenerate with black text (fill="#000000") for better visibility

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❌ Verdict: Request changes

Please address the text color contrast issue for the three noted logos, then this will be ready for approval.

[philcampeau]

Good catch. Fixed the light-coloured tokens

[perwestling]

LGTM