isolate and export resilient snack bar

[jesscmoore]

Pull Request Details

Description

• isolates and exports the resilient snack bar so that I can use snackbar response for processes in podmail

Related Issues

• Export resilient snack bar to use in podmail #411

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How To Test?

• call this method in another app, eg podmail

Checklist

• Screenshots included here/in linked issue #
• Changes adhere to the style and coding guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Any dependent changes have been merged and published in downstream modules
• The update contains no confidential information
• The update has no duplicated content
• No lint check errors are related to these changes (make prep or flutter analyze lib)
• Integration test dart test output or screenshot included in issue #
• I tested the PR on these devices:
  • Android
  • iOS
  • Linux
  • MacOS
  • Windows
  • Web
• I have identified reviewers
• The PR has been approved by reviewers

Finalising

• Merge dev into the this branch
• Resolve any conflicts
• Add a one line summary into the CHANGELOG.md
• Push to the git repository and review
• Merge the PR into dev

[jesscmoore]

Merged jess/406_overflow_navbar into this branch as podmail needs a branch with both:

• jess/411_resilient_snackbar_export
• jess/406_overflow_navbar

to support existing navbar overflow behaviour and snackbar response to donations