fix(db): infer non-nullable return type from first arg in coalesce()

[sleitor]

Problem

coalesce() was typed as (...args: Array<ExpressionLike>): BasicExpression<any>, which loses all type information when used in .select().

Fixes #1341

Solution

Update the signature to infer T from the first argument so the return type is BasicExpression<NonNullable<ExtractType<T>>>. Subsequent args remain typed as ExpressionLike to support mixed-type calls like coalesce(count(col), 0).

// Before
const a = coalesce('hello', 'world') // BasicExpression<any>
const b = coalesce(1, 2)             // BasicExpression<any>

// After
const a = coalesce('hello', 'world') // BasicExpression<string>
const b = coalesce(1, 2)             // BasicExpression<number>

Changes

• packages/db/src/query/builder/functions.ts: Updated coalesce signature with generic T inferred from first arg
• Updated type test expectation from BasicExpression<any> to BasicExpression<string>
• Added a new type inference test case

[changeset-bot]

🦋 Changeset detected

Latest commit: 348a281

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

This PR includes changesets to release 12 packages

Name	Type
@tanstack/db	Patch
@tanstack/angular-db	Patch
@tanstack/electric-db-collection	Patch
@tanstack/offline-transactions	Patch
@tanstack/powersync-db-collection	Patch
@tanstack/query-db-collection	Patch
@tanstack/react-db	Patch
@tanstack/rxdb-db-collection	Patch
@tanstack/solid-db	Patch
@tanstack/svelte-db	Patch
@tanstack/trailbase-db-collection	Patch
@tanstack/vue-db	Patch

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commit: 1b8b2c6