[6.x] Use native nested element controls in HTML forms

[riasvdv]

Description

Nested element fields in HTML forms, including Global Set content editors, now use the shared Vue cards and element index controls. Refreshes preserve unsaved input and use each nested owner's form scope.

Legacy Matrix and Addresses HTML overrides, nested element manager HTML methods, and Yii event bridges now live in yii2-adapter, preserving plugin overrides and compatibility APIs.

src/             Native Form payloads and permissions
resources/js/    Shared Vue controls and HTML form host
yii2-adapter/    Legacy rendering and Yii compatibility

[github-actions]

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