This pull request introduces structured logging to the project by replacing ad-hoc and print-based logging with the tracing crate and its subscriber. It removes the custom file-based log_debug function and updates log statements throughout the codebase to use the new logging framework. This will provide more flexible, configurable, and production-ready logging.

The most important changes are:

Logging infrastructure improvements:

• Added tracing and tracing-subscriber dependencies to Cargo.toml to enable structured, leveled logging throughout the application.
• Removed the custom log_debug function and all direct file-based logging from src/main.rs, replacing them with tracing macros (debug!, info!, error!). Initialized the subscriber with environment-based filtering and improved log formatting.

Codebase logging updates:

• Replaced println! statements in src/ui/file_explorer.rs with tracing::debug! for drop events and file upload operations, ensuring all logs are consistent and configurable. [1] [2]

Application startup:

• Added an informational log message at startup to indicate the application version using info!.