feat: background line thickness settings added

[arpandaze]

Adds settings to control the thickness of background lines.

[adil192]

This is cool, can you just refactor lineWeight to lineThickness. Atm it looks too similar to lineHeight!

[arpandaze]

This is cool, can you just refactor lineWeight to lineThickness. Atm it looks too similar to lineHeight!

Sure. I have just refactored it into lineThickness but pipeline seems to be failing due to late initialization in 1 test. I have also added default value for the preference but not sure why its throwing error. Can you please let me know how to fix this?

[codecov]

Codecov Report

Attention: Patch coverage is 35.89744% with 25 lines in your changes missing coverage. Please review.

Project coverage is 47.15%. Comparing base (e81fab0) to head (6bf96d7).

Files with missing lines	Patch %	Lines
lib/components/toolbar/editor_bottom_sheet.dart	0.00%	16 Missing ⚠️
lib/pages/editor/editor.dart	0.00%	5 Missing ⚠️
lib/data/editor/editor_core_info.dart	72.72%	3 Missing ⚠️
...b/components/canvas/canvas_background_preview.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1192      +/-   ##
==========================================
- Coverage   47.22%   47.15%   -0.07%     
==========================================
  Files         114      114              
  Lines        8966     9002      +36     
==========================================
+ Hits         4234     4245      +11     
- Misses       4732     4757      +25     

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[adil192]

Sure. I have just refactored it into lineThickness but pipeline seems to be failing due to late initialization in 1 test. I have also added default value for the preference but not sure why its throwing error. Can you please let me know how to fix this?

Oof yeah that was a tricky issue.
The reason was that large files (like v6_stress_test_179.sbn) are parsed on a separate isolate which doesn't have access to Prefs.
I fixed it by falling back to the default line thickness instead of the last line thickness if we're not on the main isolate