Add new element entry screen

[CSchmitz81]

• in element dialog
• hide fab
• enter title in top bar
• select element type in top bar
  • validates user has permission to create type
  • if permissions not added yet, add placeholder and restrict seed from being created
  • if creating parent of a new element, only show options for allowed parent types
• description entry
  • initially show empty textbox
  • add segment buttons above and below textbox
• suggest possible duplicates in element dialog body
  • element preview items (possibly smaller than list)
  • divider above separation from description section
  • scrolls with description (i.e. don't scroll each separately)
  • can select element preview
    • stop new item creation
    • open in view mode
    • supports going back
      • re-enter edit mode
      • preserve previously entered description
• save progress to user data
  • if user closes dialog it should be possible to restore (not part of this issue)
• add item button
  • shouldn't look like fab
  • validates fields
    • has valid title
      • not empty
      • minimum words specified by tree
    • has type
    • has valid description segment
      • validation responsibility of segment types
      • at least 1 description segment
  • if can have parent
    • opens element linking page
    • keep progress in user data
  • if can't have parent
    • save to cTree
    • remove data (after added to cTree)

[CSchmitz81]

Multiple separate element entry tickets have been created for the MVP which can be leveraged to implement this.