requests_unixsocket is now an optional dependency, only needed when connecting to redner on a unix socket

Enhance _set_value_from_template to support Redner integration

- Rename fields/methods for clarity:
  * dynamic_placeholder_button_hidden -> hide_placeholder_button
  * _compute_dynamic_placeholder_button_hidden -> _compute_hide_placeholder_button
- Restructure JS components:
  * Replace dynamic_placeholder_charfield_patch with new component-based implementation
  * Add proper prop handling and converter type awareness
- Add onchange handler to clear value when converter changes
- Refactor placeholder computation using dictionary mapping
- Update XML views with new field names and component parameters
- Improve mimetype.py documentation and default handling

Reuse odoo guess mimetype code and compatibility code between different versions of python-magic.

Also factorize some code and add comment.

- Introduced a button to dynamically set the expression in the substitution line.
- The feature is available for converters of type "Odoo template", "Odoo template + Evaluation", and "Field".
- Added functionality to visualize how to define each converter, displaying a placeholder (example) for each converter type.
- The code has been designed to ease the integration of additional converters in the future.
- Refactored the code to improve performance and stability.

- Added python-magic to external dependencies in __manifest__.py
- Fixed metadata formatting for print-paper-size in ir_actions_report.py

Renamed `find_field_with_sort_order` to `parse_sorted_field`.

- Updated the `find_field_with_sort_order` function to return
`(expression, None)` when the regex doesn't match.
- This provides clearer feedback by preserving the original expression.

& latest xcg/templates/odoo_module.