Fix TypeError when form contains input with name="id" (#2528)

* Initial plan

* Core: Fix form.id property collision with input name="id"

Co-authored-by: bytestream <1788397+bytestream@users.noreply.github.com>

* Core: Revert Gruntfile changes (not needed for fix)

Co-authored-by: bytestream <1788397+bytestream@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: bytestream <1788397+bytestream@users.noreply.github.com>