nixpkgs: 72ac591 (Jan 17) → 078d69f (Jan 22)

Includes recent fixes from Jan 8:
- switch-to-configuration-ng: add timeout to systemd daemon reload/reexecute
- switch-to-configuration-ng: fix systemd reexec/reload D-Bus signal handling

- Server config in deploy/coord.is/ (networking.nix excluded - contains origin IP)
- CF API token encrypted with agenix
- Auto-deploy from flake at 03:00 UTC (before fdroid-update at 04:30)
- Added nixosConfigurations.coord to flake

CI builds now use date-based versions (e.g., 2026.1.24 / 20260124).
Debug builds use .dev app ID suffix for side-by-side installation.

- Create /root directory before ~/.ssh in CI container
- Remove unsupported SVG and unnecessary PNG from drawables

- Create /root directory before ~/.ssh in CI container
- Remove unsupported SVG and unnecessary PNG from drawables