sdmApp 0.0.3

Breaking and infrastructure changes

Dropped the archived rgdal and rgeos dependencies. sdmApp now relies on raster (>= 3.6.3), which reaches GDAL, GEOS and PROJ through terra, so the package installs again on current R.
Reworked DESCRIPTION: packages actually used by the exported functions moved to Imports; the modelling engines used only inside the shiny interface stay in Suggests and are checked at launch.
NAMESPACE is now generated by roxygen2 from targeted @importFrom tags instead of a blanket exportPattern() and long @import lists.

sdmApp() no longer calls itself recursively and builds the shiny app only once. It validates theme and maxRequestSize up front and stops with an informative message listing any missing suggested packages.
Replaced the deprecated ggplot2::aes_string() with aes() and .data[[ ]] across the mapping helpers.
Replaced guides(fill = FALSE) with guides(fill = "none").
Replaced fragile class(x) == "SpatialBlock" comparisons with inherits().
Added input validation to sdmApp_PA(), sdmApp_RasterPlot(), sdmApp_TimesRasters() and sdmApp_fold_Explorer().

Replaced the placeholder unit tests with real tests that exercise the exported functions against the bundled example data.
Rebuilt the GitHub Actions workflows (R-CMD-check, pkgdown, test-coverage, lint) on r-lib/actions v2 and current runners.