fix: import sbn/sbn2 when in root folder

[ZebraVogel94349]

This fixes the import of .sbn and .sbn2 files into the root directory. When widget.path was null, importFile() was called with the parameter 'null/' which caused the file not to be imported. Also, this makes the imported note open correctly after importing by removing the file extension from the path (previously, an empty .sbn2.sbn2 file was opened).

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (58406d9) 37.31% compared to head (a4bc5b5) 37.33%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
lib/pages/home/recent_notes.dart	0.00%	9 Missing ⚠️
lib/components/home/new_note_button.dart	0.00%	4 Missing ⚠️
lib/components/home/move_note_button.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #977      +/-   ##
==========================================
+ Coverage   37.31%   37.33%   +0.01%     
==========================================
  Files         106      106              
  Lines        7729     7741      +12     
==========================================
+ Hits         2884     2890       +6     
- Misses       4845     4851       +6     

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[adil192]

Thanks!