Implement comprehensive backup monitoring and fix timestamp issues

- Add BackupCollector for reading TOML status files with disk space metrics
- Implement BackupWidget with disk usage display and service status details
- Fix backup script disk space parsing by adding missing capture_output=True
- Update backup widget to show actual disk usage instead of repository size
- Fix timestamp parsing to use backup completion time instead of start time
- Resolve timezone issues by using UTC timestamps in backup script
- Add disk identification metrics (product name, serial number) to backup status
- Enhance UI layout with proper backup monitoring integration

dashboard/src/ui/widgets/mod.rs

@@ -4,10 +4,12 @@ use ratatui::{layout::Rect, Frame};
 pub mod cpu;
 pub mod memory;
 pub mod services;
+pub mod backup;
 
 pub use cpu::CpuWidget;
 pub use memory::MemoryWidget;
 pub use services::ServicesWidget;
+pub use backup::BackupWidget;
 
 /// Widget trait for UI components that display metrics
 pub trait Widget {
@@ -16,10 +18,4 @@ pub trait Widget {
     
     /// Render the widget to a terminal frame
     fn render(&mut self, frame: &mut Frame, area: Rect);
-    
-    /// Get widget name for display
-    fn get_name(&self) -> &str;
-    
-    /// Check if widget has data to display
-    fn has_data(&self) -> bool;
 }