Upgrade to Astro 6 with Content Layer API migration

[devin-ai-integration]

Summary

Upgrades Astro from 5.17.2 to 6.1.5 with full Content Layer API migration, plus adds @astrojs/check and typescript for type checking.

Astro 6 Migration

• Migrated content collections to Content Layer API with glob() loaders (src/content.config.ts)
• Replaced entry.slug → entry.id and entry.render() → render(entry) throughout
• Updated Zod schemas for Zod 4 (z.string().url() → z.url(), removed .step())
• Added .nvmrc and NODE_VERSION=22 in netlify.toml (Astro 6 requires Node 22)
• Derived file extensions from entry.filePath for nav prompt (preserves .md, .org, etc.)

Type Checking

• Added @astrojs/check and typescript as dev dependencies
• Fixed all 13 pre-existing type errors caught by astro check:
  • verbatimModuleSyntax: use type-only imports for CollectionEntry
  • Optional body: handle body?: string in Content Layer API
  • astro-icon: spread typed props to avoid v0.x/v1.x type mismatch
  • og_image.tsx: wrap Buffer in Uint8Array for Response constructor
  • [project].astro: rename import to avoid conflict with local declaration

Review & Testing Checklist for Human

• Verify deploy preview renders identically to live site: https://deploy-preview-44--davish-site.netlify.app
• Check nav prompt shows file extensions (e.g. markov-ideas.md) — this is an intentional change
• Spot-check blog post links, TIL links, reading entries, and RSS feed for correct URLs (no /undefined)
• Consider running npx astro check locally to verify type checking works in your environment

Notes

• The astro-icon package uses the v0.x runtime API (pack/name props) but ships v1.x types — worked around with typed spread props rather than migrating the Icon usage (which would require adding the icon() integration to astro.config.mjs)
• Netlify uses pnpm, so pnpm-lock.yaml was updated alongside package-lock.json

Link to Devin session: https://app.devin.ai/sessions/79c3ab22e9a1430db50a92123c2c309c
Requested by: @davish

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[devin-ai-integration]

Visual Comparison Test Results

Tested deploy preview vs live site across 7 page types. Found and fixed a bug — 5 components still used .slug (undefined in Astro 6) instead of .id, causing broken links. Fixed in 2bda02b.

All 7 tests passed after fix.

Bug Found & Fixed: slug→id in 5 components

🔴 Before Fix	🟢 After Fix
<h1> href = /blog/undefined	<h1> href = /blog/2026/02/markov-ideas

Files fixed: Heading.astro, SnippetTable.astro, ReadingEntry.astro, AuthorEntry.astro, Project.astro

Test Results (7/7 passed)

• Blog post title permalink — PASSED. <h1> links to /blog/2026/02/markov-ideas
• TIL snippet links — PASSED. All 9 snippets link correctly (e.g. /til/nix/flake-update)
• Reading entry links — PASSED. Book entries link correctly (e.g. /reading/2026/the-great-alone)
• Reading detail page — PASSED. Nav shows ~/reading/red-rising.md, content and pagination correct
• Weekly post — PASSED. Nav shows ~/weekly/2026-04-11.md, content and pagination correct
• Resume projects — PASSED. Project link is /projects/obsidian-full-calendar
• RSS feed — PASSED. Valid XML, 0 occurrences of "undefined", correct URLs

Devin session