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.

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

@@ -14,6 +14,7 @@ export type FloatingButtonProps = {
   className?: string;
   Icon?: IconComponent;
   title?: string;
+  ariaLabel?: string;
   size?: FloatingButtonSize;
   position?: FloatingButtonPosition;
   applyShadow?: boolean;
@@ -27,6 +28,7 @@ export const FloatingButton = ({
   className,
   Icon,
   title,
+  ariaLabel,
   size = 'small',
   position = 'standalone',
   applyBlur = true,
@@ -46,6 +48,7 @@ export const FloatingButton = ({
   return (
     <ButtonComponent
       disabled={disabled}
+      aria-label={ariaLabel}
       className={clsx(styles.button, styles[size], className)}
       data-position={position}
       data-apply-blur={applyBlur || undefined}

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

@@ -1,6 +1,7 @@
 import { type Meta, type StoryObj } from '@storybook/react-vite';
 import { IconSearch } from '@ui/icon';
 import {
+  A11Y_DEFER_COLOR_CONTRAST,
   CatalogDecorator,
   type CatalogStory,
   ComponentDecorator,
@@ -44,8 +45,7 @@ export const Catalog: CatalogStory<Story, typeof FloatingButton> = {
     focus: { control: false },
   },
   parameters: {
-    // TODO(a11y): violations inherited from deprecated story; fix during a11y pass
-    a11y: { test: 'todo' },
+    a11y: A11Y_DEFER_COLOR_CONTRAST,
     pseudo: { hover: ['.hover'], active: ['.pressed'] },
     catalog: {
       dimensions: [