[byRandom]

This finishes 0.6 with saved settings, and does proposal #4 of the architecture review: layers get stable ids. It also prepares release 0.6.0.

Saved settings

• The app remembers these between runs:
  • the seed;
  • the dimension;
  • the view (center, zoom, biome y);
  • which layers and overlays are shown;
  • the seed finder's query (center, filters, biome, seed range).
• They are stored through eframe's persistence feature, as a RON file in the platform's app data folder. The new settings.rs defines Settings, with a version field.
• Every field has a default, so a file written by another version still loads: missing fields get their default and unknown fields are ignored.
• The values are checked on load: zoom and y are clamped, and a non-finite center becomes 0.
• If the seed field holds text that was never applied, the app saves the seed actually shown on the map.

Layers with stable ids (proposal #4)

• Each Kind now has an id (villages, bastions, end_cities, …) and a Source: Spawn, Strongholds, or Set { set, only }.
• The pseudo set names SPAWN and STRONGHOLDS are gone, along with the string comparisons spread across the app. That logic now lives on the layer: is_spawn(), searchable(), has_ships() and select().
• Settings and finder filters refer to layers by id, never by their position in the list:
  • a layer added later shows its default;
  • a layer that no longer exists is ignored;
  • a finder filter on a missing layer is dropped.

Tests

• These are the app's first unit tests:
  • settings survive a save and load;
  • layers are kept by id;
  • partial files and files with unknown fields load;
  • layer ids are unique;
  • finder filters need a searchable layer.
• Checked by hand under a virtual display:
  • the app saves its settings to app.ron;
  • after editing that file to Nether, seed 12345, 150 % zoom, a new center, nether fossils on and an end-city filter with a ship, a fresh start shows exactly that, both on the map and in the finder.

Release

Version 0.6.0, notes in docs/releases/v0.6.0.md. After merging, run Actions → Release → Run workflow on main.

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