IgniteUI / igniteui-angular / 38246038623

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fix(forms): gate invalid state on touched or dirty (#17674)

* fix(forms): gate invalid state on touched or dirty

* refactor(radio-group): mark group touched on blur, not via buttons

The group handed its onTouched callback to every radio button, which
overwrites the single callback slot a button bound to its own form
directive already filled. Marking the group's control touched from the
blur handler it already subscribes to needs no callback on the buttons
at all, so nothing can be clobbered and no per-button guard is needed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

* docs(changelog): move the forms invalid-state entry under Unreleased

* fix(forms): restore invalid state when signal fields leave readonly

* docs(forms): trim invalid-state comments and README notes

Keep the code comments and README sections to the user-visible rule;
the details of how the fix works belong in the PR description.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: Martin Dragnev <37667452+mddragnev@users.noreply.github.com>

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