PLU-591: [show-multiple-rows-1]: add helper functions

[m0nggh]

TL;DR

Added utilities for converting table data to HTML format for transactional emails and hex encoding/decoding for variable modifiers.

What changed?

Created two new utility modules:

1. format-table-variable.ts - Converts table data from execution steps into HTML tables for email compatibility:

   • Validates table data structure with proper TypeScript interfaces
   • Supports column selection through selectedColumnIds option
   • Generates HTML with inline CSS styling (alternating row colors, borders)
   • Includes XSS protection through HTML escaping
   • Returns structured success/error results with detailed error messages

2. hex-encoding.ts - Provides hex encoding/decoding functions for variable modifiers:

   • hexEncode() converts UTF-8 strings to hexadecimal representation
   • hexDecode() converts hex strings back to UTF-8
   • Designed for safe regex parsing of table variable syntax like table:col1,col2

How to test?

1. Table formatting: Import formatTable and test with sample table data containing rows and columns arrays
2. Column selection: Test with selectedColumnIds option to verify column filtering works correctly
3. Error handling: Test with invalid data structures, missing columns, or empty column lists
4. Hex encoding: Test hexEncode('table:col1,col2') and hexDecode() with the resulting hex string

Why make this change?

These utilities enable table variable functionality in transactional emails by providing a robust way to convert execution step data into properly formatted HTML tables, while the hex encoding ensures safe and predictable parsing of variable modifiers in email templates.

[m0nggh]

• PLU-591: [show-multiple-rows-4]: add frontend table variable #1539
• PLU-591: [show-multiple-rows-3]: add preprocess to postman email #1538
• PLU-591: [show-multiple-rows-2]: modified step regex and add table variable marker #1537
• PLU-591: [show-multiple-rows-1]: add helper functions #1536 👈 (View in Graphite)
• develop-v2

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[linear]

PLU-591 Render find multiple rows in a table in Postman action