Newline before . in .profile, if .profile doesn't end on newline

Steps to Reproduce

Installing rye:

$ curl -sSf https://rye.astral.sh/get | bash
This script will automatically download and install rye (latest) for you.
######################################################################## 100.0%
Welcome to Rye!

This installer will install rye to /home/user/.rye
This path can be changed by exporting the RYE_HOME environment variable.

Details:
  Rye Version: 0.42.0
  Platform: linux (x86_64)

✔ Continue? · yes
✔ What should running `python` or `python3` do when you are not inside a Rye managed project? · Run the old default Python (provided by your OS, pyenv, etc.)
Installed binary to /home/user/.rye/shims/rye
Bootstrapping rye internals
Downloading cpython@3.12.7
Checking checksum
Unpacking
Downloaded cpython@3.12.7
Updated self-python installation at /home/user/.rye/self

The rye directory /home/user/.rye/shims was not detected on PATH.
It is highly recommended that you add it.
✔ Should the installer add Rye to PATH via .profile? · yes
Added to PATH.
note: for this to take effect you will need to restart your shell or run this manually:

    source "$HOME/.rye/env"

For more information read https://rye.astral.sh/guide/installation/

All done!

I have performed the installation twice from the same snapshot. The result can be reproduced.

Expected Result

end of ~/.profile:

export PATH="$PATH:/home/user/.local/share/JetBrains/Toolbox/scripts"
. "$HOME/.rye/env"

Actual Result

end of ~/.profile:

export PATH="$PATH:/home/user/.local/share/JetBrains/Toolbox/scripts". "$HOME/.rye/env"

Version Info

$ rye --version
rye 0.42.0
commit: 0.42.0 (b8f472e15 2024-10-21)
platform: linux (x86_64)
self-python: cpython@3.12.7
symlink support: true
uv enabled: true

Stacktrace

No response