Spool Studio 3.1.1

This update fixes existing filament names being changed when editing a spool (issue #10).

• Existing filament names keep their full length, capitalization and spelling when changing spool data, selecting a color or importing RFID metadata.
• The field is now labeled Filament Name. Names are no longer automatically formatted or limited to 40 characters in the form. Rename a product explicitly, or use Use suggested color as filament name to replace it with a color suggestion.
• Clear printer assignment keeps tag links. It no longer falls back to SET_SPOOL_ID=0, which also unlinks legacy UIDs in Paxx12 firmware 2.0.0-paxx12-24. A later RFID scan may assign the spool again.
• Manage tag links → Unlink remains a separate, confirmed action. It removes the tag's native and compatibility links without clearing an already loaded printer assignment.
• Settings now explain that firmware 2.0.0-paxx12-24 still requires compatibility mode: leave Native tags only off and retain card_uids when migrating.

Validation: 128 automated tests passed; debug build and Android Lint completed successfully (zero lint errors). Physical NFC / U1 testing remains outstanding.

Version: 3.1.1 · Android version code: 25.

Please test whether updating an existing spool now preserves its original filament name and report your results in issue #10.