RarityCore

### Added

- Edit-mode panel can now be dragged with the mouse (position is not persisted; resets on restart)

- Added FTB Library item border rendering compatibility (Mixin + compatibility manager registration)

- Added `enableIronSpellsAdapter` config option to disable Iron Spells rarity integration (issue #14)

### Fixed

- Fixed broken rendering integration with Refined Storage

- Fixed collapsible panel click accidentally triggering mode switch; restored right-click editing of item slots

- Fixed dragging outside the panel causing unintended panel movement (added press-guard inside the panel)

- Panel position is now clamped during rendering to keep it within the screen bounds

### Build & Other

- Updated build and release workflow with version parsing and publishing support

- Updated .gitignore to exclude new build files