Add author and tag filtering to blog pages

[Copilot]

Implements filtering capability for blog posts by author and tag. Users can now click tags or author names to view filtered post lists.

Changes

• Dynamic filter pages: Created /author/[name] and /tag/[tag] routes using Astro's static path generation

  • Author pages: Naoki, RiiiM, Millin, TANIZAKI
  • Tag pages: Tech, Poem, Event, Security, Review, C#, Node.js, proxy, Document, mitmproxy, Info

• Interactive BlogCard: Converted static tags and author text to clickable links with hover states

• Helper utility: Added getTags() to extract unique tags from content collection

Implementation

// BlogCard now wraps tags and authors in links
<a href={`/tag/${tag}`}>
  <Badge variant="outline" className="transition hover:bg-gray-100">
    #{tag}
  </Badge>
</a>

<a href={`/author/${author.name}`} className="hover:underline">
  {author.name}
</a>

Each filter page maintains consistent styling with breadcrumb navigation back to main blog listing.

Screenshot

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fonts.googleapis.com
  • Triggering command: /home/REDACTED/.nvm/versions/node/v22.14.0/bin/node node /home/REDACTED/work/web/web/node_modules/.bin/../astro/astro.js build conntrack --ctstate INVALID,NEW -j DROP (dns block)
• iojs.org
  • Triggering command: /usr/bin/curl curl -q --fail --compressed -L -s REDACTED -o - (dns block)
• telemetry.astro.build
  • Triggering command: /home/REDACTED/.nvm/versions/node/v22.14.0/bin/node node /home/REDACTED/work/web/web/node_modules/.bin/../astro/astro.js build conntrack --ctstate INVALID,NEW -j DROP (dns block)
  • Triggering command: /home/REDACTED/.nvm/versions/node/v22.14.0/bin/node node /home/REDACTED/work/web/web/node_modules/.bin/../astro/astro.js dev (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>ブログページに作者、タグでの絞り込みを実装</issue_title>
<issue_description>現状記事数が多くないので優先度低</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ブログページに作者、タグでの絞り込みを実装 #32

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