* feat: enhance source map handling in NLS and private field conversion
- Implemented inline source maps in the NLS plugin to ensure accurate mapping from transformed source back to original.
- Modified `transformToPlaceholders` to return edits for source map adjustments.
- Added `adjustSourceMap` function to update source maps based on text edits in `convertPrivateFields`.
- Introduced tests for source map accuracy in both NLS and private field conversion scenarios.
- Updated documentation to reflect changes in source map handling and the rationale behind accepting column imprecision.
* address PR review: fix source name collision, guard unmapped segments, reorder mangle before NLS
