[1.3.0] Templates are here!

The template system has been fully reworked.

1. You can now access templates from the main menu.
2. You can export and import templates using CSV files.
3. You can export price configurations directly from a price change.

Other fixes:
1. Fixed a bug where users with many inactive prices could not load active ones.

[1.2.3]
- Resolved API errors in price schedule endpoints by adding one day to the current date to avoid date conflicts.

[Version 1.2.2]
- Adapted app to latest Apple Store Connect API changes.
- Added warnings when using the wrong private key file type.

[Version 1.2.1]
- Added instructions for creating price templates.

[Version 1.2]
- Added a more complete explanation of subscription price decrease behavior.
- Removed commas from Japanese yen.