Danny White e57aae3c83 feat(design-system): document disabled controls and add focusableWhenDisabled (#50068)
## What kind of change does this PR introduce?

Docs update, with supporting `ui` and Studio changes.

## What is the current behaviour?

Disabled buttons with tooltips use native `disabled`, which removes them
from the tab order. Keyboard users cannot focus the control or read the
tooltip explaining why an action is blocked.

The design system also lacked guidance on keeping disabled actions
discoverable and explaining why they are unavailable.

## What is the new behaviour?

- Adds a **Disabled controls** section to the accessibility docs, with
live examples for a focusable disabled button and visible page-level
context
- Adds `focusableWhenDisabled` to `Button`, keeping `disabled` as the
semantic state while using `aria-disabled`, retaining keyboard focus,
and guarding click handlers
- Updates Studio's `ButtonTooltip` to make disabled buttons with tooltip
text focusable automatically

Also includes earlier design-system fixes on this branch:

- Centralises `BASE_PATH` with a `/design-system` fallback so asset URLs
work without a local `.env` file
- Fixes sidebar hover and active tokens in design-system and ui-library,
aligned with Studio's `InnerSideMenuItem`

## To test

**Design system**

1. Open the [accessibility
preview](https://design-system-git-fix-design-system-docs-and-nav-fixes-supabase.vercel.app/design-system/docs/accessibility)
2. Scroll to **Disabled controls**
3. Tab to the **disabled-focusable** example. Confirm the button remains
focusable, looks disabled, and shows its tooltip on focus
4. Confirm the **disabled-unavailable-with-notice** example shows the
admonition and focusable disabled button pattern

**Studio (optional, requires a High Availability project)**

5. Go to Settings → General → **Pause project**. Tab to the button and
confirm it remains focusable, looks disabled, and shows the HA tooltip
on focus
6. Go to Database → Backups and find **Restore** on a scheduled backup
row. Confirm the same behaviour
2026-09-11 01:52:21 +00:00
2025-06-17 11:08:46 +02:00
2024-01-10 13:34:41 +01:00
2021-07-25 12:45:26 +08:00

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