As a Vatican Curator, I want to be able to use a widget to set up a comparison between two to four IIIF objects

[mejackreed]

Related to @ggeisler design work in sul-dlss/exhibits#1002

• Convert Mirador_Spotlight to a gem  #68 setup as a gem later on
• Validate manifests in Mirador Widget #85 Validate IIIF manifests
• Don't allow more than 4 items to be added to the mirador widget #86 Constrain items added for Mirador widget to 4
• Make mirador widget's selected manifests/exhibit items into panels #87 Style/Add behavior for manifests added via mirador widget UI as panels
• Add "Preview and configure viewer" button/popup to mirador widget #88 Add "Preview and configure viewer" button/popup to mirador widget
• Hook-up exhibit item autocomplete in Mirador widget #91 Add exhibit item autocomplete to to Mirador widget
• Add ability to generate Mirador config/state based on items added to widget #92 Add ability to generate Mirador config/state based on items added to widget
• Figure out how to pass over mirador state to embeded mirador viewer #93 ⚠️👀Figure out how to pass over mirador state to embeded mirador viewer
• Add a loading indicator for mirador items #105 Add a loading indicator for mirador items
• Allow mirador items in sir-trevor widget to be re-ordered w/ drag and drop #106 Allow mirador items in sir-trevor widget to be re-ordered w/ drag and drop
• Exhibit item should be default selection for mirador widget #176 Exhibit item should be default selection in Mirador widget
• Add instructions and annotation display checkboxes to Mirador modal. #177 Add Instructions and annotation display to modal
• Remove the top-right "x" icons and window controls from windows in the Mirador modal. #178 Remove the top-left "x" and window controls from Mirador windows (configuration)
• Only show preview and configure if items are present / mirador widget #179 Only show preview and configure if items are present / mirador widget
• Item panels, mirador widget need some leftpad #180 Item Panels, Mirador widget need leftpad/whitespace fix
• Input should be wider for manifest/exhibit item mirador widget #175 Input should be wider for mirador widget manifest input

[mejackreed]

AKA Mirador Sir Trevor Widget MSTW

[mejackreed]

Closing as no remaining items are a "blocker"