feat(core): convert wakatime card to TypeScript

[marcalexiei]

Another step of #140

• cards/wakatime.js ➡️ cards/wakatime.ts
• Test and snapshot renamed to renderWakatimeCard.test.ts / renderWakatimeCard.test.ts.snap;
  the snapshot are unchanged.
• New common/languageColors.ts owns the language-color table:
  the gist and wakatime cards repeated (languageColors as Record<string, string>)[name] || "#858585" three times, and top-languages declared a fourth copy of that hex.
  They now share getLanguageColor() / DEFAULT_LANG_COLOR, and typing the table at the import removes the cast.

[vercel]

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