Add SSH-Agent plugin

[martasskv5]

Plugin

• Id: martasskv5/ssh-agent
• New plugin
• Update to an existing plugin (version bumped in plugin.toml)

What it does

Manage your SSH keys and saved sessions directly from the Noctalia bar. This plugin keeps a small SSH agent running in the background, lets you add or remove keys, and provides a panel for quick session management. Similar to PuTTY pagaent on Windows.

External dependencies

• ssh - used for opening sessions
• ssh-agent - agent running in background managing keys
• ssh-add - for adding keys
• zenity - used for browsing and selecting private ssh key file
• mkdir - for creating non-existing directories
• pkill - for stopping the ssh-agent proccess

For passphrase prompts:

• ksshaskpass
• ssh-askpass
• lxqt-openssh-askpass

Agent socket is saved in /tmp directory by default

Testing

Opened the panel from bar and using IPC. Added the key using the Browse button. Verified key presence using ssh-add -l and by opening a new remote session.
Added new session using New Session button. Edited the save and then connected.
Everything works as intended.

• Tested on Niri
• Tested on Hyprland
• Tested on Sway
• Tested on another compositor:
• Noctalia version tested against: 5.0.0_beta.8-1
• Plugin API level: 9

Screenshots / Videos

Checklist

• The directory name matches the part of id after the / in plugin.toml exactly.
• It ships plugin.toml, README.md, thumbnail.webp, and translations/en.json.
• README.md follows the
  README template, documents
  every entry id and dependency, and includes exact panel IPC commands and launcher prefixes where applicable.
• I created thumbnail.webp with the thumbnail generator.
• version follows semver and is bumped in this PR; plugin_api is the oldest API level this plugin requires.
• Every non-English translation in this PR uses a locale supported by Noctalia core, and I can read, write, and
  understand that language well enough to review and maintain it (no unreviewed machine/LLM translations).
• I did not edit catalog.toml; CI generates it.
• This PR touches exactly one plugin directory.

Code review attestation

• The code is readable and not obfuscated, minified, or generated.
• It does not download and execute remote code.
• Every network call, filesystem write, and spawned process is something the description above accounts for.
• I have the right to publish this code under the license declared in plugin.toml.