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 If you want to try, cd into packaging/flatpak and run 'build_flatpak.sh'.

For some reason it pulls/uses rust 1.77.2 which is too old for some of the deps.  I can't figure out why it is using that since both rust installs on my system are 1.80. 
 The "cargo fetch" call fails, can't find the Cargo.toml file. I'll figure it out.

Running: cargo --offline fetch
error: could not find `Cargo.toml` in `/run/build/gossip` or any parent directory

I've changed the org.freedesktop.Platform runtime req version to 24.08 in the manifest and i pulled the latest rust-stable flatpak sdk (also 24.08) 
 I've found out the problem ... by adding a "rustc -V" command in the manifest's build-commands at the top, i can see which rust version the flatpak env is using.

When you use org.freedesktop.Platform v22.08, the rust version is 1.72.0. If you use v23.08, the rust version is 1.77.2. And if you use v24.08 (the latest), the rust version is 1.81.0.

So setting "runtime-version" to "24.08" in the flatpak manifest should fix the flatpak build problem ! 
 brilliant!  Thank you. 
 glad i could help, thank you for gossip.