Update CHANGELOG for version 26.0.0 with 2026.1 support

fix gradle properties

Update dependencies, enhance IntelliJ platform config, and bump plugin version to 26.0.0

remove fleet support :(

Add theme configuration with comprehensive color palette and UI elements

Add contrast handling and implement polished for theme generation

Map new theme tokens 'fc' and 'invert' to appropriate values

Map new theme tokens 'fc' and 'invert' to appropriate values

Refactor theme generation and add YAML-based theme loading

Add fleet theme generation support and placeholders in template

Add Justfile and JSONNet template for theme conversion

Expand syntax highlighting with detailed text attributes

Add text attributes for syntax highlighting in material-oceanic theme

Update material-oceanic theme configuration

Refactor material-oceanic.json structure for consistency.