feat: compacter look of recurrence, lines & dependencies in Edit Task modal

[ilandikov]

Description

• Make padding smaller around dependencies
• Don't render empty space under dependency inputs when there are no dependencies (Make dependency inputs have the same spacing as date inputs in this case)
• Smaller & symmetrical margins around the horizontal lines
• Move recurrence in the same section with scheduled, due, starts date (As agreed here)

Motivation and Context

Make the Edit Task modal look better on all screens =)

How has this been tested?

Manual test in demo vault

Screenshots

Dependencies	Before	After
Without
With

Types of changes

Changes visible to users:

• New feature (prefix: feat - non-breaking change which adds functionality)

Checklist

• My code follows the code style of this project and passes yarn run lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• My change has adequate Unit Test coverage.
  • No CSS unit test available

Terms

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

[ilandikov]

Please note the diff in Dependency.svelte is not rendered correctly in GitHub, the change is 2 lines added + a lot of indentation

[ilandikov]

This will also fix the wrong width of the recurrence input that can be seen here - it is not matching the width with the date inputs

[claremacrae]

Merging without testing, as I don't have time, and trust you to have tested... 😄