giles a98354c0f0 Fix duplicate headers on HTMX nav, editor content loading, and double mount ...

- Nest admin header inside post-header-child (layouts.py/helpers.py) so
  full-page DOM matches OOB swap structure, eliminating duplicate headers
- Clear post-header-child on post layout OOB to remove stale admin rows
- Read SX initial content from #sx-content-input instead of
  window.__SX_INITIAL__ to avoid escaping issues through SX pipeline
- Fix client-side SX parser RE_STRING to handle escaped newlines
- Clear root element in SxEditor.mount() to prevent double content on
  HTMX re-mount
- Remove unused ~blog-editor-sx-initial component

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-03 16:27:47 +00:00

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