Improve long list item rendering without aggressive word splitting

[yukihane]

Summary

This PR improves long list item rendering in the post body without forcing aggressive word splitting.

Changes

1. Add a minimal reproduction page:

   • exampleSite/content/posts/issue-157-list-wrap.md

2. Update list layout in assets/css/main.css:

   • Replace hanging indent via text-indent: -2ch with a more stable bullet layout using
     padding-inline-start + ::before absolute positioning
   • Scope the rule to .post-content .body ul so non-body list UIs are unaffected

Why this layout-based approach

This PR focuses on stabilizing bullet layout instead of introducing aggressive word-breaking rules.

Compared to adding word-break: break-all, this approach keeps wrapping behavior closer to browser defaults:

• long tokens (including URLs) are less likely to be broken at arbitrary character boundaries
• readability is preserved while still fixing the visual bullet/text split issue

In short: this fixes the layout root cause without forcing global hard word-splitting.

Scope

• CSS-only rendering fix
• No API/config changes
• No required content migration

Fixes #157