Updated readability of species display with auto-id

Improved sonagram performance and now it needs only ca. 10% of the previous versions. That means roughly 5% processor use on modern hardware and thus less power consumption.

Updated the species id tool and reduced reports of unnecessary "Species found" messages

Apart from general stability updates we improved some of the Pro features. The app now creates a directory for each day with recordings. The file browser and the built in measurement tools got an improved UI. Furthermore the measurement view now allows to flip forwards or backwards in the file list. A new power save mode exists that uses bat calls for starting the sonagram.

You can now choose a volume for the heterodyne signal on iPhone in the settings popover

Smaller UI improvements and call classifiers updated to CoreML2025 version.

Updated the sound volume on iPhone (signals was rather low amplitude), on iPad you have a volume control for the heterodyne live detector. Solved a bug with the frequency mixer slider and display in zoomed in sonagram mode. Deactivated the stop and display of detail sonagram for now since the tap gesture interfered with usage. Will come back improved. Pro subscription: Added a power save mode in settings to reduce power usage; either choose a lower update frequency for the sonagram or a SPL-depended activator.