[fix] findOne returns array instead of single object in angular-db (issue #1261)

[claude]

Summary

• Fixes injectLiveQuery in @tanstack/angular-db to return a single object (or undefined) when used with findOne(), instead of always returning an array
• Adds proper type overloads so TypeScript correctly infers Signal<T | undefined> for findOne() queries

Fixes #1261
Repro PR: #1272

Root cause

The angular-db adapter was missing the singleResult handling that was already implemented in react-db and vue-db. Specifically:

1. Runtime: syncDataFromCollection always converted collection values to an array via Array.from(currentCollection.values()) and set it directly on the data signal. It never checked collection.config.singleResult to decide whether to return a single item or the full array.

2. Types: InjectLiveQueryResult.data was always typed as Signal<Array<TResult>>, with no way to express Signal<TResult | undefined> for findOne() queries.

Fix

• Added a computed signal for data that checks collection.config.singleResult and returns either the first element or the full array (matching the pattern in vue-db and react-db)
• Updated InjectLiveQueryResult to use InferResultType<TContext> for the data signal type, which correctly resolves to T | undefined for SingleResult contexts and Array<T> otherwise
• Added InjectLiveQueryResultWithCollection and InjectLiveQueryResultWithSingleResultCollection interfaces for pre-created collection overloads

How to test

pnpm --filter @tanstack/angular-db test -- --run

All 21 tests pass, including the new findOne test.

🤖 Generated with Claude Code

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🦋 Changeset detected

Latest commit: 60c11dd

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

This PR includes changesets to release 1 package

Name	Type
@tanstack/angular-db	Patch

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commit: 60c11dd

[github-actions]

Size Change: 0 B

Total Size: 92.1 kB

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Size Change: 0 B

Total Size: 3.7 kB

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Filename	Size
./packages/react-db/dist/esm/index.js	225 B
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