Add support for array mutating methods in proxy change tracking

[KyleAMathews]

Summary

• Add proper tracking for array mutating methods (push, pop, shift, unshift, splice, sort, reverse, fill, copyWithin)
• Fix existing array tests that were misleadingly named but didn't actually call the methods they claimed to test
• Add comprehensive test coverage for all supported array mutating methods

Test plan

• All existing proxy tests continue to pass
• New array method tests verify proper change tracking
• Original objects remain unchanged while proxy tracks mutations
• All 62 proxy tests passing

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: ddb37fa

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

This PR includes changesets to release 6 packages

Name	Type
@tanstack/db	Patch
@tanstack/electric-db-collection	Patch
@tanstack/query-db-collection	Patch
@tanstack/react-db	Patch
@tanstack/vue-db	Patch
@tanstack/db-example-react-todo	Patch

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[pkg-pr-new]

@tanstack/db-example-react-todo

@tanstack/db

npm i https://pkg.pr.new/@tanstack/db@267

@tanstack/electric-db-collection

npm i https://pkg.pr.new/@tanstack/electric-db-collection@267

@tanstack/query-db-collection

npm i https://pkg.pr.new/@tanstack/query-db-collection@267

@tanstack/react-db

npm i https://pkg.pr.new/@tanstack/react-db@267

@tanstack/vue-db

npm i https://pkg.pr.new/@tanstack/vue-db@267

commit: ddb37fa

[github-actions]

Size Change: +36 B (+0.1%)

Total Size: 34.8 kB

Filename	Size	Change
./packages/db/dist/esm/proxy.js	3.79 kB	+36 B (+0.96%)

ℹ️ View Unchanged

Filename	Size
./packages/db/dist/esm/collection.js	8.45 kB
./packages/db/dist/esm/deferred.js	230 B
./packages/db/dist/esm/errors.js	150 B
./packages/db/dist/esm/index.js	568 B
./packages/db/dist/esm/local-only.js	815 B
./packages/db/dist/esm/local-storage.js	2.07 kB
./packages/db/dist/esm/optimistic-action.js	294 B
./packages/db/dist/esm/query/builder/functions.js	531 B
./packages/db/dist/esm/query/builder/index.js	3.49 kB
./packages/db/dist/esm/query/builder/ref-proxy.js	842 B
./packages/db/dist/esm/query/compiler/evaluators.js	1.34 kB
./packages/db/dist/esm/query/compiler/group-by.js	2.09 kB
./packages/db/dist/esm/query/compiler/index.js	1.48 kB
./packages/db/dist/esm/query/compiler/joins.js	1.15 kB
./packages/db/dist/esm/query/compiler/order-by.js	933 B
./packages/db/dist/esm/query/compiler/select.js	657 B
./packages/db/dist/esm/query/ir.js	318 B
./packages/db/dist/esm/query/live-query-collection.js	2.06 kB
./packages/db/dist/esm/SortedMap.js	1.24 kB
./packages/db/dist/esm/transactions.js	2.29 kB

_{compressed-size-action::db-package-size}

[github-actions]

Size Change: 0 B

Total Size: 1.05 kB

ℹ️ View Unchanged

Filename	Size
./packages/react-db/dist/esm/index.js	152 B
./packages/react-db/dist/esm/useLiveQuery.js	902 B

_{compressed-size-action::react-db-package-size}

[samwillis]

Lgtm