feat: add desktop file and icons

[shenghuang147]

Background

Checklist

• The Pull Request has been fully tested
• There's an entry in the CHANGELOGS
• There is a user-facing docs PR against https://github.com/daeuniverse/daed

Full changelogs

• [Implement ...]

Issue reference

Closes #[issue number]

Test Result

• GNOME:
• KDE:

[kunish]

Could you please add a screenshot to illustrate what this PR does?

[shenghuang147]

What?

I added a Linux desktop file for the web panel, which allows users to launch the web panel from their desktop environment with a single click. The desktop file contains the name, icon, URL, and category of the web panel.

Why?

I added this feature because it improves the user experience and accessibility of the web panel. Users do not need to open a browser and type the URL of the web panel every time they want to use it. They can simply click on the desktop icon and the web panel will open in their default browser.

How?

I created a new file called daed.desktop in the install directory of the project. I used the Desktop Entry Specification to define the properties of the desktop file. I also added a new icons directory in the install directory, which contains the icon files for daed. I added multiple sizes of icons to ensure that they look good on different resolutions and scaling factors.

Testing?

I tested this feature on openSUSE Leap 15.5. I verified that the desktop file was installed correctly and that the web panel opened in the browser when I clicked on the icon. I also checked that the icon and name of the web panel were displayed correctly in the desktop environment.

Screenshots

Here are some screenshots of how the web panel looks like on different desktop environments:

• GNOME:
• KDE:

[kunish]

Well, your supplement far exceeded my expectations. Thank you so much for that. Now I have a good understanding about what this does. Amazing detail.