Add hidden RSS source link for link posts and corresponding styles

[sids]

Motivation

• Ensure link-type posts include an explicit RSS source link in the post HTML so feed readers can surface the original source while keeping visual output unchanged for normal page views.

Description

• Add rssSourceLink markup in postTemplate to render a <p class="rss-source-link"> that links to post.link when present in src/templates/post.ts.
• Insert the rssSourceLink into the .post-content area immediately before the post HTML output in postTemplate.
• Add CSS rules in styles/input.css to hide .rss-source-link (display: none) and to remove the top margin on the following element (.post-content > .rss-source-link + * { margin-top: 0; }).
• Update src/templates/post.test.ts to assert the RSS source link is present for link posts while keeping existing expectations intact.

Testing

• Ran unit tests with bun test; the updated postTemplate test (src/templates/post.test.ts) passed.
• No other automated test failures were reported.

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Codex Task

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	sids-in	4304592	Commit Preview URL Branch Preview URL	Mar 01 2026, 12:31 PM