svemagie e8ba3b9ae6 feat: nested tags (Obsidian-style) for categories system ...

Adds hierarchical tag support using "/" separator (e.g. "tech/programming/js").
- New filters: nestedSlugify, categoryMatches, categoryBreadcrumb,
  categoryGroupByRoot, categoryDirectChildren
- categories collection auto-generates ancestor pages for nested tags
- categories.njk: breadcrumb nav, sub-tags section, ancestor-aware post matching
- categories-index.njk: grouped tree view (root + indented children)
- categories widget: shows root tags only with child count badge
- All category links updated from slugify → nestedSlugify (backward-compatible)

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

2026-03-15 10:56:34 +01:00

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