Make post topic optional

[HumbleBee14]

Topics are no longer mandatory. A post can belong to a topic hub or stand alone.

Schema: topicId is now optional (z.enum(...).optional()). Frontmatter for existing posts is unchanged.

What a topicless post keeps: /blog archive, on-site search, tag pages, author page, RSS, Google, and "related" strips (via shared tags). What it opts out of: /topics/<x> hub pages and topic chips — exactly the point.

Guards added at every topicId read site so nothing renders an empty chip or breaks:

• Homepage cards, PostRow, blog post page (chip, breadcrumb, pagefind-meta all conditional)
• RSS category, author-page topic grouping, countPostsByTopic, topicName(undefined)
• Related-posts: topic'd posts relate by topic; topicless posts fall back to shared tags (never match each other via undefined === undefined)

Editor: topic selector labeled "optional" with a "No specific topic" choice; the hard "Pick a topic" validation is removed; the serializer omits topic/topicId frontmatter when none is chosen. (Proposing a new topic was already supported via proposedTopic.)

Verified: built with a real topicless post — appears in /blog with no empty chip, absent from all /topics hubs, build green. Added a serializer test for the omitted-topic case (62 tests pass).

[cloudflare-workers-and-pages]

Deploying mlsystems with    Cloudflare Pages

Latest commit:	162171a
Status:	⚡️  Build in progress...

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