feat: full group support

e2e/README.md

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+# e2e
+
+Install deps with `corepack pnpm i`.
+
+Ensure that if you update `@playwright/test` that
+(a) it remains a devdep, and
+(b) it is a `=`-type dependency.
+
+Start a dev server with `cargo run`. Tests expect an ephemeral user with username and
+password both `test`. Achieve this with
+```
+cargo run set-password test
+```
+then
+```
+sqlite3 users.db "update users set ephemeral=true where username='test'"
+```
+
+Run tests in the docker image with the right browsers installed with `./Taskfile
+playwright:local` or `./Taskfile playwright:ui`.
+
+