Renames html-editor-panel → page-editor-panel and changes the handled
extension from .html/.htm to .page. The new editor introduces a structured
format (page-header / page-root / page-block / page-area / page-footer),
a block registry with Full Width and Two Columns templates, a two-mode
sidebar (Blocks / Areas), rich-text wrapSelection helper, auto-template
injection for empty files, sandbox="allow-same-origin" on the iframe,
and editor-style injection that is stripped before saving.
Adds a default-roject theme (dark BG, Barlow font, blue headings) embedded
as a <style> block in the page <head>, scoped to [data-theme="default-roject"]
on both <body> and <page-root>. Areas toolbar gains H1, H2, H3 buttons.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Rokojori