Implement Clean Slate theme system

[Naseem77]

• Replace hardcoded gray colors with theme-aware CSS variables
• Migrate to OKLch color space with Clean Slate theme
• Add Inter, Merriweather, and JetBrains Mono fonts
• Fix theme toggle functionality between light and dark modes
• Improve database connection error messages with user-friendly text

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[overcut-ai]

Summary

• BLOCKER: 0, CRITICAL: 0, MAJOR: 6, MINOR: 0, SUGGESTION: 0, PRAISE: 0
• Key themes:
  1. Theme toggling and Tailwind dark variants are out of sync, so dark-mode utilities never activate and persisted system preferences now map to undefined tokens.
  2. The Clean Slate token implementation introduces build/runtime regressions (unsupported @theme directive, loss of /alpha utilities, and flash of the light palette before JS runs).
  3. Database connection UX still discards backend-provided error text for most HTTP failures, undermining the friendlier messaging goal.

Next steps

1. Restore .dark class toggling or update Tailwind to honor [data-theme='dark'], and sanitize stored theme values before applying them.
2. Define tokens in a way compatible with Tailwind 3 alpha utilities or upgrade the toolchain before using @theme, and ensure dark palette defaults to avoid flashes.
3. Parse JSON error bodies for all non-OK statuses in DatabaseModal and only fall back to generic messages if none are provided.