feat: Add loading states and comprehensive modal accessibility #16
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Summary
This PR implements loading states for modal actions and comprehensive accessibility improvements:
Loading States
aria-busy="true"on buttons during submissionAccessibility Improvements
role="dialog",aria-modal="true", andaria-labelledbyTests
test_button_disables_on_form_submission: Verifies button is disabled during processingtest_spinner_visible_during_submission: Confirms spinner appears when form is submittedtest_aria_busy_attribute_during_submission: Validates ARIA attributes are correctly setFiles Changed
modal_actions.js: Loading state management and accessibility implementation (156 lines changed)modal_actions.css: Spinner animation and loading styles (68 lines added)modal_actions.html: Button markup with spinner and ARIA live region (13 lines changed)test_modal_actions.py: Three new Selenium tests (93 lines added)Test plan
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