fix(db): throw error when fn.select() is used with groupBy()

[kevin-dp]

Summary

• fn.select() combined with groupBy() silently produced wrong results (only { __key_0: ... } instead of the expected computed fields) because processGroupBy() received undefined for selectClause
• The root cause is that groupBy needs to statically analyze the SELECT clause to discover aggregate functions (count, sum, max, etc.), which is not possible with fn.select() since it's an opaque JavaScript function
• Added FnSelectWithGroupByError that throws a clear error message directing users to use the standard .select() API instead

Closes #1189

Test plan

• Added test that fn.select() + groupBy() throws FnSelectWithGroupByError
• All existing group-by tests pass (100 tests)

🤖 Generated with Claude Code

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🦋 Changeset detected

Latest commit: e60aa76

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: cd033fa

[github-actions]

Size Change: +157 B (+0.17%)

Total Size: 92.8 kB

Filename	Size	Change
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[github-actions]

Size Change: 0 B

Total Size: 3.85 kB

ℹ️ View Unchanged

Filename	Size
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