Updated `Index.cshtml`:
- Added icons and a more descriptive project title.
- Introduced a new introductory paragraph explaining the app's purpose.
- Replaced the old alert section with a detailed workflow explanation.
- Added cards for invoice upload and summary navigation.
- Included a technology stack section with badges for key tools.
Updated `Details.cshtml`:
- Replaced text-based icons with DevExpress icons for titles, buttons, and attachments.
- Improved attachment handling with `<i>` tags and consistent icon usage.
- Updated "No attachments" message to include an icon.
These changes enhance the UI's visual consistency, usability, and professionalism.
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