- Fix hardcoded user path in webapps.nix (use homeDirectory)
- Normalize wallpapers option to use .enable suffix
- Remove duplicate FZF keybind declaration
- Update comments to match actual implementation
matrix-nio is installed in the container's writable venv layer
(~/.venv) but the hermes process uses the read-only Nix store Python.
This adds PYTHONPATH and LD_LIBRARY_PATH as container-level env vars
so matrix-nio + libolm (e2e encryption) are importable.