Convert offline page to extend base.html for sidebar

The offline page now uses Jinja2 template inheritance to get the
site sidebar automatically. All functionality preserved.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
2025-11-30 01:59:01 -05:00
parent 09e7db70d9
commit 102115abd0
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