root 6ca8519250 Add responsive preview, editor themes, template gallery, devtools, and autocomplete ...

- Device breakpoint toggles (mobile 375px / tablet 768px / desktop 100%)
- Editor theme selector with 6 themes (VS Dark/Light, High Contrast, Monokai, Dracula, GitHub Dark)
- Starter template gallery with 8 pre-built templates (Todo, API Fetch, CSS Animation, etc.)
- Code autocomplete with DOM/React type definitions and snippet completions
- Devtools panels: console, network, elements, performance
- Code formatter (Prettier), diff view, and linter integration

2026-02-27 01:22:16 -06:00

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