v1.0.6

fix: preserve description on header/path/query param import

Postman's description on headers, path variables, and query params was
never read, dropping it from the imported table row instead of populating
the Description column those tables already support. Padding to a 3-column
row only when at least one description is present keeps imports without
any unchanged (still a plain 2-column table with the "+ Description"
affordance).