Extracts the merchant name from trimmed, non-empty receipt lines.
Prefers "לכבוד:" recipient lines; falls back to first meaningful non-boilerplate line.
Parameters
lines: string[]
Trimmed, non-empty receipt lines.
Returns string|false
The merchant name string, or false if none could be identified.
Extracts the merchant name from trimmed, non-empty receipt lines. Prefers "לכבוד:" recipient lines; falls back to first meaningful non-boilerplate line.