Previously only mapped folders from the current compilation glob patterns.
Now scans project directory for all ts_* folders to ensure imports like
'../ts_shared/' are rewritten to '../dist_ts_shared/' even when compiling
only the main ts/ folder.
When compiling multiple ts_* source directories to dist_ts_* outputs,
imports like '../ts_shared/helper.js' now correctly become
'../dist_ts_shared/helper.js' in the compiled output.
Uses targeted regex patterns that only match import/export/require
statements, avoiding false positives in strings or comments.
