Suppress findPath throw when translating beforeinput target ranges in Editable (#3556)

[isachivka]

Description

Editable.onDOMBeforeInput has two ReactEditor.toSlateRange call sites that hard-code suppressThrow: false — the event.getTargetRanges() branch and the WebKit ShadowRoot branch. When the browser's target range points at a DOM node that is no longer resolvable to a Slate node (stale NODE_MAP entry after a re-render, IME composition, clicking between editors), findPath throws Unable to find the path for Slate node: … out of the DOM event handler, reaching window.onerror and crashing the host app. This is the long-standing #3556 family.

Every other toSlateRange call site in this file already passes suppressThrow: true and null-checks the result — this PR aligns the last two:

• getTargetRanges branch: suppressThrow: true; when the range is unmappable, fall back to slate's synthetic handling at the current selection (native = false) — native handling can't be trusted with a range we couldn't map. Resolvable ranges behave exactly as before.
• WebKit ShadowRoot branch: suppressThrow: true; on null skip only the Transforms.select, still preventDefault (letting WebKit native-edit a shadow-root range we couldn't map would diverge the DOM from the model).

Context / evidence

In production (slate-react 0.124.2) this is a steady session-killing crash — ~8 users/day, all with the identical stack:

Error: Unable to find the path for Slate node: {...}
    at Object.findPath
    at Object.toSlatePoint
    at Object.toSlateRange
    at HTMLDivElement.<anonymous>   ← Editable.onDOMBeforeInput, getTargetRanges branch

toSlatePoint/toSlateRange already honor suppressThrow around their findPath calls (returning null), so the change is confined to the two call sites and their degrade paths.

Checks

• yarn test:jest after yarn build:rollup: 94/94 pass.
• yarn lint:typescript: no new errors (the conditional return type T extends true ? Range | null : Range makes the null-narrowing type-safe).
• Changeset added (slate-react patch).

Issue

Relates to #3556

[changeset-bot]

🦋 Changeset detected

Latest commit: d7cb40e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
slate-react	Patch

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