Feature/35514 csv import mapping

[Nick-Lucas]

Closes framer/company#35514

Description

• Adds a field mapping view with simple automatic type inference
• Replaces the increasingly complex state management of this plugin with a simple minirouter and more procedural workflows
• Tidies up UI look and feel, fixes bugs with drag and drop detection
• Breaks up some huge files which were becoming difficult to work with

Test files:

jobs.csv
people_added_column.csv
people_duplicate.csv
people_empty.csv
people_missing_slug.csv
people_removed_column.csv
people_reordered.csv
people.csv
people2_changed_column_type.csv
people2_draft.csv
people2_renamed_column.csv
people2_withjob.csv

Testing

Useful synthetic test imports:

• Import people.csv and it works
• Import people.csv and then a variety of scenarios on top, ie.
  • added_column
  • removed_column
  • reordered
  • people2.csv (some overlap with conflicts and some new entries
  • changed column type (we only warn that incompatible data will be skipped, it's up to the user to change their fields model)
  • renamed column (can rebind to the existing column)
• Importing people2_draft.csv sets drafts up correctly
• Importing jobs.csv, manually creating a multireference to your people collection and reference to jobs collection, and importing people2_withjobs.csv correctly links up references
  • Bonus: importing people2_withjobs.csv into a new collection doesn't handle the reference but does create the column
• importing empty csv just rejects
• Customising types
  • New columns can have a selection of compatible column types selected from beyond the inferred type
  • Existing columns do not permit changing the column type

[Nick-Lucas]

/cursor review