feat: custom visual divider line widgets (___ bold division, --- hairline split) in editor

[dariomory]

Summary

• Visual Divider Distinction:
  • ___\ (triple underscore): Rendered with .cm-divider-bold\ as an impactful accent division with subtle glow.
  • ---\ (triple dash): Rendered with .cm-divider-subtle\ as a clean 1px hairline split.
  • Frontmatter delimiter protection: Opening/closing frontmatter ---\ lines are preserved and not replaced with widgets.
• CodeMirror 6 Decorator & Cursor Reveal:
  • Custom \�isualDividers\ ViewPlugin and \DividerWidget\ in \Editor.tsx.
  • When the cursor is on the line, reveals the raw markdown text for smooth editing, and seamlessly restores the widget on blur.
• Outline & Navigation Compatibility:
  • Dividers are treated as clean section splits and excluded from bubble outlines, metadata badges, and \Mod-a\ selection.
• Tests: Comprehensive unit and visual decorator tests in \Editor.test.tsx\ (all tests passing, 0 build errors).

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