Add dark mode and theme switching functionality to the application.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 705f2157-ef97-4fbd-89e4-8c7f2ecaea90
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/7ed01c5f-a82d-405a-b728-b2e3d127c60c/69154111-0a6b-4eae-ac42-425c5260b653.jpg

.dockerignore

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+# Version control
+.git
+.gitignore
+.github
+
+# Node.js
+node_modules
+npm-debug.log
+yarn-debug.log
+yarn-error.log
+
+# Build output
+dist
+build
+coverage
+
+# Environment variables and secrets
+.env
+.env.*
+!.env.example
+
+# Docker
+Dockerfile
+docker-compose.yml
+.dockerignore
+
+# Documentation
+README.md
+DEPLOYMENT.md
+docs
+*.md
+
+# Development tools and configuration
+.vscode
+.idea
+*.sublime-*
+.editorconfig
+.eslintrc
+.eslintignore
+.prettierrc
+.prettierignore
+nodemon.json
+tsconfig.tsbuildinfo
+
+# Temporary files
+.tmp
+.temp
+*.log
+*.swp
+*.swo
+.DS_Store
+Thumbs.db
+
+# Other configurations
+# (nginx removed)
+
+# Tests
+__tests__
+*.test.ts
+*.test.tsx
+*.spec.ts
+*.spec.tsx
+jest.config.js