[arenabuddy] Convert UI theme from light to dark mode

[gazure]

This pull request implements a comprehensive dark theme for the Arena Buddy application. The changes include:

Visual Theme Updates:

• Replaced light backgrounds (white, gray-50) with dark equivalents (gray-800, gray-900, gray-950)
• Updated text colors from dark grays to light grays for better contrast on dark backgrounds
• Changed border colors from light grays to darker variants (gray-700, gray-800)
• Modified accent colors from blue/indigo to amber/violet for better dark theme aesthetics

Component-Specific Changes:

• Updated all major components including match details, draft displays, event logs, deck lists, and navigation
• Changed button styles and hover states to work with the dark theme
• Updated status indicators and badges with appropriate dark theme colors
• Modified scrollbar styling for dark backgrounds

Color Scheme Adjustments:

• Primary accent color changed from blue to amber
• Success states now use amber instead of green
• Error states use red variants optimized for dark backgrounds
• Secondary elements use violet/purple tones

Global Styling:

• Added body background and text color defaults in the CSS file
• Reformatted the opentelemetry-otlp dependency configuration for better readability
• Fixed unused import in sync.rs

The theme maintains accessibility and readability while providing a modern dark interface that's easier on the eyes during extended use.

[gazure]

• [arenabuddy] improve scraping of basic land arts #325
• [arenabuddy] add tmnt cards #324
• [arenabuddy] Update CLI documentation and fix MTGA database file extension #323
• [arenabuddy] Fix mulligan decision capitalization from lowercase to title case #322
• [arenabuddy] Convert UI theme from light to dark mode #321 👈 (View in Graphite)
• Remove generated Tailwind CSS file and add to gitignore #320
• Simplify CLAUDE.md development documentation #319
• [arenabuddy] Add automatic match sync from server on login and startup #318
• main

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[gazure]

Merge activity

• Mar 1, 1:15 AM UTC: @gazure merged this pull request with Graphite.