Fix item detail for datagrid nested in another component

[radimvaculik]

Fixes #1299

Problem

Datagrid renders data-datagrid-name="{$control->getFullName()}" (src/templates/datagrid.latte:17), so datagrid.name in JS is the component full name (eg. myComponent-grid). The detail row class uses the full name too (item-detail-{$control->getFullname()}-id-...).

But ItemDetailPlugin compared datagrid.name against data-toggle-detail-grid, which only holds the plain name (grid). For a datagrid placed directly in a presenter both values are equal and everything works; as soon as the grid lives inside another component the comparison never matches and the item detail never toggles.

Fix

src/Column/ItemDetail.php already renders data-toggle-detail-grid-fullname (added back in c1b5f57 "ItemDetail fix for multiple datagrids at same page") — the TypeScript plugin just never started using it during the jQuery → vanilla TS rewrite. The plugin now prefers the full name attribute and falls back to the plain one for hand-rendered buttons.

No PHP change needed.

Notes

Other plugins (checkboxes.ts, inline.ts) compare against data-check / payload._datagrid_name, both of which are already filled with the full name, so they are not affected.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.12%. Comparing base (ab5506d) to head (dd78ae8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1300   +/-   ##
=======================================
  Coverage   49.12%   49.12%           
=======================================
  Files          63       63           
  Lines        2974     2974           
=======================================
  Hits         1461     1461           
  Misses       1513     1513           

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