supabase / supabase / 29950606994

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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 *... (continued)

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