[Feature]: Enhanced import and "Up Next" workflow

[RobRoyce]

Is your feature request related to a problem? Please describe. Yes. The "Up Next" dialog is severely limited and non-intuitive.

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Describe the solution you'd like Several things, but primarily boils down to "provide enough detail about sources to make organization easier".

• The "Up Next" queue should be visible at all times as a floating dock
• User should be able to drag and drop sources from the floating dock into a project
• The floating dock should be expandable
  • When collapsed, display source icons, right click to trigger pop-up details
  • When expanded, display source cards w/ details
• Communicate where sources came from (i.e. which method, application, etc.)
• Communicate when sources were imported
• Allow both focused and aggregate views for Up Next
  • Focused: display details of an individual source
  • Aggregate: display relationships, summaries, commonalities, similarities, etc.

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Describe alternatives you've considered Improving the existing Up Next could have a similar effect, but lack of visibility makes it feel like an add-on instead of an integral part of the application and user workflow.

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Additional context None

[RobRoyce]

Added several of the features in v0.6.0