harper-desktop for non apple hardware/OS's

**What problem does this solve?**
Not all of us have $10,000,000,000,000,000,000,000,000,000,000 to spend on a machine with soldered in parts that you can't upgrade on hardware that will probably be fully unusable in 10 years from now because apple locks down their overpriced hardware.

**Proposed Solution**
How should it work? Like it does on macos without needing to buy an overpriced piece of crap with a fruit logo on it.

Start by reviewing harper-desktop's existing macOS behavior and identifying which non-Apple hardware and operating-system targets are intended. Establish the target platform and acceptance criteria before assessing the work needed; done means the desktop app works on the selected target like it does on macOS.

Written by the indexing model from the issue text.