[oleeskild]

Summary

Template half of the dg-hide rework. Makes published notes honor three independent hide flags written by the Obsidian plugin (companion PR: oleeskild/obsidian-digital-garden#796):

• hide (dg-hide) — hide everywhere: filetree, search, graph, backlinks, RSS feed, sitemap. Page still reachable by URL.
• hideInFiletree (dg-hide-in-filetree) — filetree only.
• hideInGraph (dg-hide-in-graph) — graph only (unchanged).

Implements #708 and #295; resolves #240 / #726.

Changes

• src/helpers/filetreeUtils.js — filetree hides on hide || hideInFiletree.
• src/helpers/linkUtils.js — graph node hide = hide || hideInGraph; new private = hide flag.
• src/site/_includes/components/sidebar.njk — backlinks skip private notes.
• .eleventy.js — new notHidden filter.
• src/site/search-index.njk, feed.njk — filter through notHidden.
• src/site/sitemap.njk — skip page.data.hide.
• Vitest coverage for filetree + graph hide logic.

⚠️ Breaking change

Notes previously using dg-hide for filetree-only decluttering will now also leave search/graph/feed/sitemap. Migrate those to dg-hide-in-filetree.

Known / intentional (not addressed here)

• dg-hide notes stay reachable by direct URL by design.
• graph.json still physically ships hidden nodes; the client renderer filters them (pre-existing behavior, same as hideInGraph).
• random.njk could still land on a hidden note — possible follow-up.

Test Plan

• npx vitest run src/helpers/filetreeUtils.test.js src/helpers/linkUtils.test.js — 17/17 pass
• Build smoke test with fixture notes: dg-hide note absent from searchIndex.json, sitemap.xml, and feed.xml entries; valid search JSON; dg-hide-in-filetree note still present in search/sitemap

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