docs: document fn.select() + groupBy() limitation

[kevin-dp]

Summary

• Add warnings in the live queries guide (groupBy section and Functional Select section) noting that fn.select() cannot be used with groupBy()
• Add note to BaseQueryBuilder API reference for fn.select() method

Companion to #1324 which adds the runtime error.

Refs #1189

🤖 Generated with Claude Code

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commit: 42e84c1

[github-actions]

Size Change: 0 B

Total Size: 92.6 kB

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