console: upgrade to React 19

[leedqin]

Motivation

Moves the Console to React 19. Dependabot's #39497 bumps the packages alone, which fails typecheck and 37 unit tests. This PR includes the code and test changes the bump needs.

Supersedes #39497.

The first four commits are separate PRs. Please review them there: #39609 (use-resize-observer, react-window, auto-sizer), #39610 (codemirror-toolkit), #39611 (visx) and #39613 (Chakra 2.10). Each removes a dependency that doesn't support React 19. They drop out of this PR once they merge. Review only the last commit here.

Description

• Dependencies: react, react-dom, @types/react and @types/react-dom move to 19.3.0.
  • resolutions pins @types/react, because @types/react-is 17 (via Frontegg) otherwise keeps an @types/react 17 copy. A second copy hides real errors, because it keeps the global JSX namespace alive.
  • @emotion/react is deduped, which drops react-select's nested 11.11.4 copy.
• Type fixes, mostly from types-react-codemod:
  • useRef() calls get an initial value.
  • RefObject types become nullable.
  • Global JSX.Element becomes React.JSX.Element.
• Manual fixes:
  • IntegrationsGallery dropped a second props: any parameter, which React treated as legacy context.
  • A lost narrowing in ShellVirtualizedList is fixed.
  • Two Chakra radio cards are typed with UseRadioProps.
  • act comes from @testing-library/react instead of the removed react-dom/test-utils export.
  • SwitchStackModal's icon is a display: contents span instead of a fragment. React 19 warns when Chakra puts aria-hidden on a fragment, and the button already has its own label.
• Test harness: React 19 doesn't retry a component that suspends inside an act that isn't awaited. That left 37 tests stuck on the Suspense fallback.
  • renderComponent, two local render helpers and the renderHook calls in environments.test.ts now render inside await act(async () => …).
  • Every caller awaits them. A type-aware no-floating-promises pass over the tests found no unawaited render left.
  • Four spinner and empty-state tests only passed because they asserted before the mocked response arrived. They now use a handler that never resolves, or waitFor.

Verification

Existing tests, with the harness changes above. Compared with React 18, the suite no longer logs the ReactDOMTestUtils.act deprecation or the element.ref warning.

Worth clicking through on the preview, roughly by risk:

1. Log out and back in through Frontegg. Check the "Contact support" footer and the sign-up message: Frontegg still uses react-is 17 to recognize these custom slots.
2. Cold boot and a region switch, watching for a stuck loading screen or flicker.
3. Cluster details: the replicas, materialized view and index lists, the largest-objects card and the charts. React 19 shows a Suspense fallback before rendering the suspended component's siblings, so watch for spinner flashes.
4. Radio cards: the enable-region selector and the Connect drawer's MCP option.
5. react-select and downshift dropdowns in the create-source forms and Query History filters. react-select now shares Chakra's emotion instance.
6. The Shell: run queries, autoscroll, history search and the tutorial.
7. Billing and the Stripe payment form.

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