fix: honour setDisabled(true) on RadioInput

[dakorpar]

Closes #112.

The bug

RadioInput::getControl() decided each item's disabled attribute purely from isValueDisabled(), and that helper returns false whenever the control is disabled as a whole (it only inspects the array form). Nothing else consulted isControlDisabled(), so setDisabled(true) on a radio list rendered markup with no disabled anywhere — the list looked and behaved as fully interactive, contrary to the bool|array signature.

Nette still refused the posted value server-side, so this was a rendering defect rather than a security hole, but the user-visible behaviour was wrong.

The fix

Set the attribute on the fieldset container, which RadioInput already uses as its container prototype:

$container->setAttribute('disabled', $this->isControlDisabled());

This mirrors CheckboxListInput, which puts 'disabled' => $this->isControlDisabled() on its own fieldset — one attribute disables every control inside it, and per-item disabling via setDisabled(['x']) keeps working unchanged.

Tests

tests/Traits/ChoiceInputTraitTest.php carried a test that deliberately pinned this gap (testDisablingTheWholeRadioListIsNotReflectedInTheHtml) so a fix would surface as a failure. That test is replaced by one asserting the correct behaviour, plus:

• re-enabling with setDisabled(false) drops the attribute again
• the attribute survives showValidation()
• exact-HTML assertions in tests/Inputs/RadioInputTest.php for both the wholly-disabled and single-item-disabled cases
• an E2E case in tests/E2E/FormSubmissionTest.php covering render + rejected post together

make tests (155 tests), make phpstan and make cs all pass.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.05%. Comparing base (104dd03) to head (36900c7).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #128      +/-   ##
============================================
+ Coverage     96.94%   97.05%   +0.10%     
  Complexity      308      308              
============================================
  Files            25       25              
  Lines           983      984       +1     
============================================
+ Hits            953      955       +2     
+ Misses           30       29       -1     

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