fix: update companion edition card colors per issue #2851

[Adarshkumar0509]

Closes #2851

Hii! So basically the companion edition cards were all showing up grey regardless of which suite they belonged to — not ideal when each suite is supposed to have its own distinct color identity.

I've gone through each suite and applied the correct colors as specified in the companion PDF:

• The left ribbon on all cards now has a nice top-to-bottom gradient using the suite's color
• For face cards (J, Q, K), the card background also picks up the suite color at 50% opacity to give them that premium feel

Suites updated: CLD, FRE, LLM, DVO, AAI, and BOT.

Only touched cardPreview.svelte — no logic changes, purely visual. Let me know if anything looks off!

AI Tool Disclosure

• My contribution does not include any AI-generated content
• My contribution includes AI-generated content, as disclosed below:
  • AI Tools: [e.g. GitHub CoPilot, ChatGPT, JetBrains Junie etc.]
  • LLMs and versions: [e.g. GPT-4.1, Claude Haiku 4.5, Gemini 2.5 Pro etc.]
  • Prompts: [Summarize the key prompts or instructions given to the AI tools]

Affirmation

• My code follows the CONTRIBUTING.md guidelines

[sydseter]

@Adarshkumar0509 Looks good! Thank you for your efforts!