refactor: major codebase restructure and safety improvements

- Split monolithic main.rs into organized modules (app, network, ui, utils)
- Extract all magic numbers into named constants
- Add comprehensive bounds checking to prevent panics
- Implement network overflow detection for counter resets
- Fix division by zero in memory percentage calculations
- Add proper error handling with structured logging
- Cache expensive operations between refresh intervals
- Remove redundant Panel struct and simplify state management
- Add rate limiting for manual refresh operations
- Improve navigation with backspace key support
- Standardize error messages and clean up dead code
- Update README to align with changes

Author: Cod-e-Codes

Cargo.lock

@@ -13,3 +13,5 @@ serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.145"
 sysinfo = "0.37.1"
 tokio = { version = "1.47.1", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }

Cargo.toml

@@ -1,16 +1,17 @@
 # Gribble System Monitor
 
-A real-time terminal-based system monitor built with Rust and ratatui. Gribble provides live system metrics, process management, file browsing, and network traffic visualization in a keyboard-driven interface.
+A terminal-based system monitor built with Rust and ratatui. Provides real-time system metrics, process management, file browsing, and network traffic visualization.
 
 ![Gribble System Monitor](gribble-screenshot.png)
 
 ## Features
 
-- **System Monitoring**: Real-time CPU usage with progress bars, memory statistics, system uptime, and architecture details
-- **Process Management**: Interactive process viewer with CPU and memory usage, sortable by resource consumption
-- **File Explorer**: Navigate filesystem with keyboard controls, directory traversal with visual indicators
-- **Network Traffic**: Live network monitoring with sparkline graphs, cycle through multiple network interfaces
-- **Keyboard Navigation**: Vim-style navigation (hjkl) plus arrow keys, page navigation (PgUp/PgDn), and jump keys (Home/End)
+- Real-time CPU and memory monitoring with visual progress bars
+- Interactive process viewer sorted by resource usage
+- File system navigation with keyboard controls
+- Network traffic visualization with sparkline graphs
+- Multi-interface network monitoring
+- Vim-style keyboard navigation
 
 ## Installation
 
@@ -37,45 +38,41 @@ cargo run
 
 ### Navigation
 
-- `←→` or `h l` - Switch between panels  
+- `←→` or `h l` - Switch between panels
 - `↑↓` or `j k` - Navigate within lists, cycle network interfaces
 - `PgUp/PgDn` - Jump by page in lists
 - `Home/End` - Jump to first/last item in lists
 - `Enter` - Open directories in File Explorer
+- `Backspace` - Go up one directory
 - `r` - Refresh all data
 - `?` - Show/hide help
 - `q` or `Esc` - Quit
 
 ### Panels
 
-1. **System Monitor** - CPU usage with visual bars, memory statistics, process count, system information
+1. **System Monitor** - CPU usage, memory statistics, process count, system information
 2. **System Status** - Current time/date, disk usage, network interface statistics, system load
-3. **Process Manager** - Live process list sorted by CPU usage, full navigation support
-4. **File Explorer** - Directory browser with folder/file icons, full navigation support
-5. **Network Graph** - Real-time network traffic with interface cycling, separate RX/TX sparkline graphs
+3. **Process Manager** - Live process list sorted by CPU usage
+4. **File Explorer** - Directory browser with folder/file icons
+5. **Network Graph** - Real-time network traffic with interface cycling
 
 ## Technical Details
 
 - Built with ratatui for terminal UI rendering
 - Uses sysinfo for cross-platform system metrics
-- Implements proper scrolling for long lists
 - Updates system data every 2 seconds
-- Maintains 60-point history for network graphs (2 minutes of data)
+- Maintains 60-point history for network graphs
 - Cross-platform support (Windows, macOS, Linux)
-- Smart memory and network formatting (KB/MB/GB units)
-- Robust bounds checking and overflow protection
-- String truncation for long process/file names
+- Memory and network formatting with appropriate units
+- Bounds checking and overflow protection
+- String truncation for long names
 
 ## Requirements
 
 - Modern terminal emulator with Unicode support
-- Sufficient terminal size (minimum 80x24 recommended)
-- Read permissions for system information and process data
+- Minimum terminal size 80x24
+- Read permissions for system information
 
 ## License
 
-MIT License - see LICENSE file for details
-
-## Contributing
-
-Pull requests welcome. Please ensure code follows Rust formatting standards and includes appropriate error handling.
+MIT License