Generated _templ.go files are deterministic output from .templ sources,
same as output.css from input.css. Remove them from version control to
reduce diff noise and merge conflicts. Add build:templ and live:templ
tasks to the Taskfile so generation happens as part of the build.
Pressing Enter on the username field in login/register or the nickname
field in the join-game prompt now submits the form, matching user
expectations. Also add *.templ to the gitignore allowlist.
