Accessibility fix pass for twenty-ui input components (#21776)

Re-enables the live Storybook axe gate across the twenty-ui `input`
domain (17 story files) by removing the inherited `a11y: { test: 'todo'
}` overrides. Pilot for the wider a11y fix pass; other domains follow
the same playbook.

**What changed**
- Accessible names added to icon-only buttons, `Toggle`, `Checkbox`, and
the button groups via small additive `aria-label`/`ariaLabel` props on 8
components. Where this fully fixes the story, the override is dropped so
the full gate applies.
- Color-contrast (design-token level) is deferred — not changed — via a
new shared `A11Y_DEFER_COLOR_CONTRAST` parameter (`@ui/testing`) that
disables only the `color-contrast` rule while every other axe rule stays
enforced. Grep the constant to find all deferrals when tokens are
darkened later.
- `CatalogDecorator`: unique cell ids (clears `duplicate-id-aria`) and
dimension titles switched from empty `h1/h2/h3` to `div` (clears
`empty-heading`). Both help every domain's catalogs.

**Reviewer notes**
- No visual change: edits are aria / id / story-args / axe-config only,
so Argos parity holds.
- Input axe gate goes from 12 failing to 60/60 passing; typecheck and
lint green.

<!-- This is an auto-generated description by cubic. -->
<a
href="https://cubic.dev/pr/twentyhq/twenty/pull/21776?utm_source=github"
target="_blank" rel="noopener noreferrer"
data-no-image-dialog="true"><picture><source
media="(prefers-color-scheme: dark)"
srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source
media="(prefers-color-scheme: light)"
srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img
alt="Review in cubic"
src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a>
<!-- End of auto-generated description by cubic. -->

packages/twenty-ui/src/input/RoundedIconButton/RoundedIconButton.tsx

@@ -19,6 +19,7 @@ export const RoundedIconButton = ({
   disabled,
   className,
   size = 'small',
+  'aria-label': ariaLabel,
 }: RoundedIconButtonProps) => {
   const { theme } = useContext(ThemeContext);
 
@@ -26,6 +27,7 @@ export const RoundedIconButton = ({
     <button
       className={clsx(styles.button, styles[size], className)}
       disabled={disabled}
+      aria-label={ariaLabel}
       onClick={onClick}
     >
       <Icon size={theme.icon.size.md} />

packages/twenty-ui/src/input/RoundedIconButton/__stories__/RoundedIconButton.stories.tsx

@@ -15,11 +15,9 @@ export default meta;
 type Story = StoryObj<typeof RoundedIconButton>;
 
 export const Default: Story = {
-  // TODO(a11y): violations inherited from deprecated story; fix during a11y pass
-  parameters: { a11y: { test: 'todo' } },
   decorators: [ComponentDecorator],
   argTypes: { Icon: { control: false } },
-  args: { onClick: clickJestFn, Icon: IconArrowRight },
+  args: { onClick: clickJestFn, Icon: IconArrowRight, 'aria-label': 'Next' },
   play: async ({ canvasElement }) => {
     const canvas = within(canvasElement);