Add selectable home layouts and reorganize admin settings

#5 in tonybierman/dx-blog — merged 2026-05-29

Summary

• Add a HomeLayout enum (12 registry-derived layout kinds) wired through the public home page, with an admin selector that persists the active layout in site_settings.
• Reorganize the admin settings surface into three sidebar sections:
  • Settings — new Site Title and Site Tagline fields, surfaced in the header (tagline as a ≥sm subtitle) and footer.
  • Appearance — theme accent hue + home layout.
  • Taxonomy — categories + tags.
• Fix the bento grid overflow: rows now grow to fit card content (auto-rows-[minmax(180px,auto)]) and tiles fill their cell via a new PostCardView { fill: true } prop.
• Add a justfile with serve / clean-assets / fresh recipes.

Notes

• New public server fns get/set_site_title and get/set_site_tagline follow the existing per-key site_settings pattern (reads public, writes gated by SETTINGS_WRITE). No DB migration needed — the table already exists.
• Both targets type-check: --features server,sqlite and --features web --target wasm32-unknown-unknown.

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