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Danny White 6f6badae51 fix(eslint): promote require-explicit-tabindex to error (#48170)
## What kind of change does this PR introduce?

Accessibility / lint hardening (Safari keyboard focus).

## What is the current behavior?

`supabase/require-explicit-tabindex` is `'warn'`. Studio’s ratchet was
at 0 but the rule was still ratcheted; www / docs / design-system still
had raw `<button>` / `role="button"` call sites without an explicit
`tabIndex`.

[DEPR-627](https://linear.app/supabase/issue/DEPR-627) · follow-up to
#47984 / #48040

## What is the new behavior?

- Shared config: `'supabase/require-explicit-tabindex': 'error'`
- Swept www / docs / design-system (+ Studio test fixtures the ratchet
skipped)
- Removed the rule from the Studio ratchet + baselines

## To test

Prefer **Safari**. This PR only adds explicit `tabIndex` to raw
`<button>` / `role="button"` call sites — not links, and not controls
that already go through `Button` from `ui`.

### Marketing (`www`) ([staging
link](https://zone-www-dot-com-git-danny-depr-627-promote-req-7ae43c-supabase.vercel.app/))

- [x] Homepage frameworks / dashboard feature tabs — Tab through each
tab button
- [x] Product pages (e.g. `/auth`, `/database`) — section tab switchers
- [x] Narrow viewport — open the hamburger; Tab through menu buttons
- [x] `/partners/catalog` — filter / view controls
- [x] Blog view toggle (list ↔ grid)

### Docs ([staging
link](https://docs-git-danny-depr-627-promote-require-explici-25e46d-supabase.vercel.app/))

- [x] **Desktop (≥ lg):** top-right **⋯ menu** (hamburger icon) — opens
a dropdown that includes Theme. Not a separate theme button.
- [x] **Mobile (< lg):** top-right **hamburger** opens the sheet; close
(X) is the raw button we tagged. Theme inside the sheet uses
`ThemeToggle` / `DropdownMenuTrigger` from `ui` (already supposed to set
`tabIndex`).
- [x] **Code blocks** — copy / language controls
- [x] **Is this helpful?** — X / check are `Button` from `ui` (should
already Tab). After voting **while signed in**, the follow-up “What went
well?” / “How can we improve?” text button is the raw one we tagged.
- [x] **AI Tools → Copy as Markdown** (right rail on a guide) — this is
the only GuidesSidebar control this PR changed. “On this page” TOC items
are **links**, not covered by this lint.
- [x] **Reference docs** (e.g. JS client reference) — section headers
that expand/collapse in the left nav (`Collapsible.Trigger`)
- [x] **Troubleshooting index** — type in the search field, then Tab to
the **clear (X)** control

### Dashboard (`studio`)

No production UI changes in this PR (tests + lint config only). Quick
Safari smoke that prior tabindex work still holds:

- [x] Project sidebar — Tab through primary nav links
- [x] Settings → General — Tab through inputs / buttons
- [x] Storage → Files — Tab a bucket row / file actions
2026-07-23 05:21:15 +10:00
..