PROPOSED VARIANT #10 — Folder-rail Listing · status: FOLD-IN (Data Listing variant, not a new template)

Standard Data Listing with a left folder/tree rail that scopes the table. The rail filters; the table + toolbar + pagination are unchanged.

Recurs in: communications (campaigns, templates, automations) · lists (index).

Proposal: document as a Data Listing sub-variant (add a <aside> folder rail beside the table) rather than a standalone template.