# 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 Plain or outdated URLs keep the 1-hour cache.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 |
|---|---|
| [![Desktop](desktop.png)](desktop.png) | [![Mobile](mobile.png)](mobile.png) |

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