posts/pull-releases/003-css-cache-busting

Add content hash to stylesheet URL; start pull-releases records

Branch feature/css-cache-busting · version 0.2.1

What changed

• Hashed stylesheet URL: pages link to /static/style.css?v=<hash>, where <hash> is the first 10 hex digits of the stylesheet's SHA-256. A changed stylesheet gets a new URL, so browsers fetch it on the next page load with no hard refresh needed.
• Caching: requests carrying the current hash are cached for a year (immutable). Plain or outdated URLs keep the 1-hour cache.
• Pull-release records: new pull-releases/ folder with one subfolder per PR, each holding a README.md (title and changes) and desktop and mobile screenshots. Records for the two earlier PRs are included, with screenshots taken from builds of their final commits.
• Version: 0.2.1.

Notes

• There is no visible change in this PR; the screenshots match 002.
• pull-releases/ is not part of the app: it isn't built into the binary or deployed.

Testing

• All tests pass with the race detector (go test -race ./...).
• New test: the link's hash matches the file's SHA-256, plus Cache-Control for the hashed, plain and wrong-hash URLs.
• Built and ran locally; the hash matched sha256sum static/style.css and the cache headers were correct.

Screenshots

From the branch's build (a5ee315) running locally.

Desktop	Mobile

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