Bugfixes

[AliA5y]

In this pull request, I am fixing some bugs and applying small enhancements to the UI. Here is a summary of changes and adjustments I made to the project:

1. Enhance the UI of the intro screen.
2. Fix issues of content overflow, due different screen size, in some UI components.
3. Fix some bugs, that cause the app to crush, such as late initialization error and calling setState after a widget is disposed.
4. Add scrolling to some screens to fit with small screens and avoid overflow.
5. Fix receiving cancel issue whenever a file name contains unknown characters such as Arabic letters.
6. Fix the error of being unable to start a server in some devices.
7. Fix app crash issue when attempting to open file in windows.
8. Get rid of addresses duplicates for faster scanning, and include the first interface in the scanning process.
   Attached some sample images of issues UI changes.