Add tests and CI

[boriskaus]

What's in it

• Tests (test/):
  • build a small synthetic vertical profile with GeophysicalModelGenerator (tomography, topography, Moho, seismicity)
  • drive the GUI through its menus like a user would: Load Profile, switch field and colormap, add picks, Save Picks (checks x/depth/lat/lon, user name and profile info in the jld2 file), Load Picks, Load Picks (not modifyable), Save Screenshot
• CI (.github/workflows/CI.yml): Julia 1.10 (LTS), 1.11, 1.12 and the latest release on Ubuntu, macOS and Windows.
  • Linux runs a virtual display (xvfb), and the GUI tests must pass there.
  • On Windows, a software OpenGL driver (Mesa) is installed, and the full GUI tests run there too.
  • The macOS runners have no OpenGL at all. There, GLMakie's precompile workload is turned off and the GUI tests are skipped, so macOS only checks that the package installs and loads.
  • ADA_GUI_TESTS=true/false/auto controls this locally too.

Changes to src

• The native file dialogs are now called through PICK_FILE[] / SAVE_FILE[] Refs so that the tests can replace them. Nothing changes for users.
• Bug fix: Save Picks... overwrote the global picks Observable with a NamedTuple. After one save, you could no longer add, drag or load picks without restarting the GUI. The tests caught this.

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