refactor: clean EditTask.scss

[ilandikov]

Description

Compilation of cleanup commits:

• Remove unused classes (Absent in HTML/Svelte code)
• Replace margin & line-height properties with more suitable grid-* options
• Remove some unused properties that have no impact on any view

You may notice on the screenshots that the modal became a bit smaller, more compact. This is due to a slight difference in the spacing between the some blocks. So this is not exactly a pure refactoring, however adjusting this spacing was done in a suboptimal way currently (using fixed margins, different ways to render blocks in several places). So I will make that adjustable later on after further refactoring in a compact way.

Motivation and Context

Prepare for extraction of components from Svelte & CSS code

How has this been tested?

Visual test in demo vault of each Edit Task modal view (different widths)

Screenshots

Before	After

Types of changes

Internal changes:

• Refactor (prefix: refactor - non-breaking change which only improves the design or structure of existing code, and making no changes to its external behaviour)

Checklist

• My code follows the code style of this project and passes yarn run lint.
• My change has adequate Unit Test coverage.
  • No unit testing on CSS code

Terms

• My contribution follows this project's contributing guide
• I agree to follow this project's Code of Conduct

[claremacrae]

Thanks.