feat: Add date-picker to Reading Mode and Tasks query results

[claremacrae]

Types of changes

Changes visible to users:

• New feature (prefix: feat - non-breaking change which adds functionality)
  • Issue/discussion: Add a date-picker/calendar button to the Postpone menu - and/or other more convenient locations #2649
• Sample vault (prefix: vault - improvements to the Tasks-Demo sample vault)

Description

Add a calendar date-picker when user left-clicks on date values in Reading Mode and Tasks search results.

Motivation and Context

Fix #2649.

How has this been tested?

• Exploratory testing
• Running the newly reinstated smoke tests for editing of dates
• I've been using virtually identical code in my own vault for months. This code differs in having new Clear and Today buttons, and working correctly on mobile.

Screenshots (if appropriate)

Demo:

Date.Picker.in.Reading.Mode.and.search.results-with-border.mp4

In case I ever want to redo the demo, the source was:

## Date-picker in Reading Mode

- [ ] #task Do stuff ⏳ 2024-11-01 📅 2024-11-01

## Date-picker in Tasks plugin search results

```tasks
path includes {{query.file.path}}
hide backlink
```

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.

Terms

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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud