v2.1.0-beta.1

• Add test suite and fix brightness min handling (PR #74)
• fix(slider-v2): send color_temp_kelvin on modern HA for temperature mode (#73)
• fix(slider-v2): inverse produced out-of-range values for min>0 ranges (#63)
• test: prove media volume respects top-level min/max (#60)
• fix(slider-v2): register touch listeners passive where preventDefault is never used (#64)
• ci: modernize workflows, run on beta, auto-flag prereleases

Full Changelog: v1.0.6...v2.1.0-beta.1