Added AUR PKGBUILD for rowboat-bin (Arch Linux support)

[Shivoo29]

This PR adds Arch Linux AUR packaging support for Rowboat via a rowboat-bin
PKGBUILD. This allows Arch/Manjaro users to install Rowboat using yay or paru.

What's included

• PKGBUILD — repackages upstream .deb binary for Arch
• rowboat.install — post-install hook for icon cache refresh
• Documentation of two icon fix approaches (both tested)

Testing

• Built and installed on Arch Linux VM via makepkg -si
• Launcher appears correctly in GNOME and verified with namcap
• Tested icon resolution with both Option A and Option B approaches

Open Decision Required

The team needs to decide on AUR repo structure:

1. Keep PKGBUILD inside this repo under packaging/aur/
2. Create a separate dedicated AUR repository (e.g., rowboat-aur)

Both approaches are documented in the PR. Option 2 is recommended for
long-term maintainability and follows standard AUR community practice.

References

• AUR packaging guidelines: https://wiki.archlinux.org/title/AUR_submission_guidelines
• .desktop XDG spec: https://specifications.freedesktop.org/desktop-entry-spec/latest/

[vercel]

@Shivoo29 is attempting to deploy a commit to the RowBoat Labs Team on Vercel.

A member of the Team first needs to authorize it.

[ramnique]

From a maintainability perspective, it might make more sense to offer Flatpak and Snapcraft builds as these are officially supported by Electron-forge. Not sure if it makes sense to add all of this boilerplate to support a marginal use-case.

Having said that, I'm happy to open an issue (feature-request) in favor of an AUR package in order to get a sense of demand.

WDYT @Shivoo29?