v0.3.0

Added

• Visual card editor with live preview — configure cards directly from the HA UI
• Cards now appear in the Home Assistant card picker under "Custom cards"
• Sensor list with expand/collapse, entity picker, and delete per sensor
• Preset sensor dropdown with all 12 air quality presets
• Display Options and Colors sections in editor

Fixed

• Cards no longer crash when multiple monitor cards are on the same dashboard