Replace @ungap/structured-clone with native structuredClone

[ChumpChief]

Summary

• Remove @ungap/structured-clone (production dep) and @types/ungap__structured-clone (dev dep) from app-insights-logger, container-loader, and tree
• Native structuredClone is available in all supported environments (Node 20+ and ES2022 browsers), making this polyfill unnecessary
• In tree, the internal clone re-export from utils.ts is removed and the one test consumer is updated to use structuredClone directly. This export was not part of the public API.
• Expose structuredClone in @fluid-example/app-insights-logger's Jest config globals, since the jsdom test environment does not provide it

Bundle size impact

Measured via @fluid-example/bundle-size-tests:

Bundle	Before	After	Diff	%
loader.js	146,539 bytes	144,162 bytes	-2,377 bytes	-1.6%
azureClient.js	616,481 bytes	614,102 bytes	-2,379 bytes	-0.4%
odspClient.js	589,174 bytes	586,795 bytes	-2,379 bytes	-0.4%

All other bundles unchanged.

Test plan

• pnpm build and pnpm test pass in app-insights-logger (21 tests)
• pnpm build and pnpm test pass in container-loader (220 tests)
• pnpm build and pnpm test pass in tree (13,692 tests)
• pnpm test passes in @fluid-example/app-insights-logger

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR removes the @ungap/structured-clone polyfill (and its types) and switches call sites to the native global structuredClone, relying on the repo’s supported runtime environments where it is available.

Changes:

• Removed @ungap/structured-clone and @types/ungap__structured-clone dependencies from container-loader, app-insights-logger, and tree (and updated lockfile).
• Updated container-loader and app-insights-logger to use the global structuredClone (no import).
• Removed the internal clone re-export from tree utils and updated the one test consumer to call structuredClone directly.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Removes lock entries for @ungap/structured-clone and its types from affected importers.
packages/loader/container-loader/src/container.ts	Drops the polyfill import; continues cloning via global structuredClone.
packages/loader/container-loader/package.json	Removes @ungap/structured-clone and @types/ungap__structured-clone.
packages/framework/client-logger/app-insights-logger/src/fluidAppInsightsLogger.ts	Drops the polyfill import; continues deep-copying config via global structuredClone.
packages/framework/client-logger/app-insights-logger/package.json	Removes @ungap/structured-clone and @types/ungap__structured-clone.
packages/dds/tree/src/util/utils.ts	Removes internal clone re-export of the polyfill.
packages/dds/tree/src/util/index.ts	Stops re-exporting clone from util barrel.
packages/dds/tree/src/test/shared-tree-core/edit-manager/editManagerScenario.ts	Updates test to use global structuredClone instead of util clone.
packages/dds/tree/package.json	Removes @ungap/structured-clone and @types/ungap__structured-clone.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

[ChumpChief]

Moving back to draft while confirming browser support requirements.

[ChumpChief]

Updated downstream browser support requirements, structuredClone should be fine to use as a result.

[alexvy86]

Seems good to me. I suggest also getting eyes from someone in tree.

[CraigMacomber]

Tree changes look good to me.