fix(notebook): support ${name} template syntax for parameters

[fuleinist]

Summary

• Extend notebook parameter resolution to support ${name} template syntax in addition to existing @name syntax
• Users can now write queries with either syntax: WHERE id = @user_id or WHERE id = ${user_id}
• Both syntaxes work together in the same query

Motivation

Users coming from other SQL tools (bash, JavaScript, etc.) expect ${var} syntax to work. Previously only @name was supported, causing confusion and syntax errors.

Changes

• Updated extractParamReferences to extract both @name and ${name} patterns
• Updated hasParamReferences to detect both syntaxes
• Updated resolveParams to replace both patterns with parameter values
• Added comprehensive tests for template syntax

Test Plan

• All existing tests pass (25/25)
• Verify ${name} syntax works in notebook queries
• Verify mixed @name and ${name} in same query
• Verify unresolved parameter warnings work for both syntaxes

Closes #550

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• src/utils/notebookParams.ts
• tests/utils/notebookParams.test.ts

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_{Reviewed by step-3.7-flash · Input: 69.5K · Output: 15.7K · Cached: 597K}