* fix: Respect system precision for user facing balance qty values
- `get_precision` -> `set_precision`
- Use system wide currency precision for `stock_value`
- Round of qty defiiciency as per user defined precision (system flt precision), so that it is WYSIWYG for users
* fix: Consider system precision when validating future negative qty
* test: Immediate Negative Qty precision test
- Test for Immediate Negative Qty precision
- Stock Entry Negative Qty message: Format available qty in system precision
- Pass `stock_uom` as confugrable option in `make_item`
* test: Future Negative Qty validation with precision
* fix: Use `get_field_precision` for currency precision as it used to
- `get_field_precision` defaults to number format for precision (maintain old behaviour)
- Don't pass `currency` to `get_field_precision` as its not used anymore
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