… positions (#34550)

The root instance doesn't have a canonical property so we were not
returning a public instance that we can call compareDocumentPosition on
when a Fragment had no other host parent in Fabric. In this case we need
to get the ReactNativeElement from the ReactNativeDocument.

I've also added test coverage for this case in DOM for consistency,
though it was already working there because we use DOM elements as root.
This same test will be copied to RN using Fantom.

If there is a large owner stack, we could potentially spam multiple
fetch requests for the same source map. This adds a simple deduplication
logic, based on URL.

Also, this adds a timeout of 60 seconds to all fetch requests initiated
by fileFetcher content script.

…#34492)

---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34492).
* #34497
* __->__ #34492

[sourcemap-codec](https://www.npmjs.com/package/sourcemap-codec)
(deprecated) ->
[@jridgewell/sourcemap-codec](https://www.npmjs.com/package/@jridgewell/sourcemap-codec)

Validated that symbolication still works.

This helper weirdly doesn't include the sync lane.

Everywhere we use it we have to check the sync lane separately. We can
simplify things by simply including the sync lane.

This fixes a lack of optimization because we should not check the store
consistency for a `flushSync` render.


https://github.com/facebook/react/blob/d91d28c8ba6fe7c96e651f82fc47c9d5481bf5f9/packages/react-reconciler/src/ReactFiberHooks.js#L1691-L1693

…ing (#34548)

Stacked on #34546.

Same as #34538 but for gestures.

Includes various fixes.

This shows how it ends with a Transition when you release in the
committed state. Note how the Animation of the Gesture continues until
the Transition is done so that the handoff is seamless.

<img width="853" height="134" alt="Screenshot 2025-09-20 at 7 37 29 PM"
src="https://github.com/user-attachments/assets/6192a033-4bec-43b9-884b-77e3a6f00da6"
/>