Add explicit aria-label attributes to unlabelled interactive controls in index.html and dynamic parameter sliders in src/ui.js, fulfilling WCAG 2.1 Success Criterion 4.1.2 (Name, Role, Value).
- Add aria-label to #scope-feather-slider, #bloom-intensity-slider, #sharpen-intensity-slider, #location-search, #scene-import-file, and first-run suppression checkbox.
- Set aria-label to uniform label on dynamic style parameter sliders in ui.js.
- Add unit test suite (src/hudA11y.test.mjs) verifying accessible names across all inputs in index.html and dynamic slider construction.
Signed-off-by: Kushagra Kumar <[email protected]>
