fix: count folder contents for delete on Helix 6 (#1034)

[chrischrischris]

Problem

Fixes #1034.

On a Helix 6 site, deleting a folder from the browse UI shows a confirmation dialog asking to confirm the deletion of 0 items (and the flow is confusing/broken).

Root cause

handleDelete counts the files inside a selected folder by crawling it. That crawl used nx's crawl helper (tree.js), which lists only against the DA origin (${DA_ORIGIN}/list). On a Helix 6 site the content lives behind a different backend, so the crawl found nothing → _deleteCount came back 0.

Every other listing in da-list.js already uses source.list, which is backend-aware (isHlx6() routes to the correct origin for both the legacy DA and Helix 6 backends).

Fix

• blocks/browse/da-list/helpers/utils.js — add crawlDeleteCount, a recursive file-counter built on the backend-aware source.list. It paginates via the continuation token, recurses into subfolders with bounded concurrency, and exposes the same { results, cancelCrawl } shape the old crawl had.
• blocks/browse/da-list/da-list.js — handleDelete now calls crawlDeleteCount with the nx2 source instead of nx's DA-only crawl. Cancellation (cancelCrawl) and the mid-crawl bail-out checks are preserved unchanged.
• test/unit/blocks/browse/helpers/helpers.test.js — new tests: recursive counting, standalone-file inclusion, pagination, cancellation stops recursion, and graceful handling of a non-ok listing.

The actual deletion already worked (it uses backend-aware source.delete/source.move) — only the confirmation count was broken. This now works for both backends.

Testing

• Helper unit tests: 16 passed (5 new)
• da-list unit tests: 99 passed
• eslint on changed files: clean

🤖 Generated with Claude Code

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch.
In case there are problems, just click the checkbox below to rerun the respective action.

• Re-sync branch

Commits

• 2cacb64 ✅ (latest)

[chrischrischris]

Closing in favor of the proper fix at the shared layer: adobe/da-nx#555 makes nx2's crawl backend-aware via source.list, so da-live needs no change — its existing call to nx crawl will work on Helix 6 once that ships. This avoids reimplementing folder traversal in da-live just for the delete count.