docs(changelog): update v2026.4.1000 release notes with full details}
- Expanded Vue 3 + Vuetify 4 feature description to cover full feature parity with Angular and React - Added GUI switcher feature across all 3 frameworks with FontAwesome brand icons - Added file type detection from magic bytes for binary downloads across all GUIs - Added format toggle border styling unification across Angular, React, and Vue - Added Roboto/Roboto Mono font upgrade to per-script subsets for international text rendering - Added icon registry service for Angular with SVG icon support - Separated and clarified bugfix entries for Material Icons font and Groq API key masking