Refactor PostCSS config: trim content globs and variable safelist

Content globs: remove **/*.js (redundant with TS source) and **/*.html
(matched nothing), remove **/*.scss (defines CSS rather than consuming it),
add **/*.ts as the reliable selector source alongside **/*.templ.

Variable safelist: PurgeCSS tracks variable usage exclusively within the
CSS it processes, not via content file scanning. The six variables that
were over-specified survive automatically because they appear in var()
expressions inside kept rules in _overrides.scss and country-map.scss.
Only --bs-primary needs explicit safelisting as it is solely consumed via
getPropertyValue() in country-map.ts and never referenced in any CSS
var() expression.

Author: pierres

postcss.config.ts

@@ -4,20 +4,15 @@ import cssnano from "cssnano";
 module.exports = {
     plugins: [
         purgeCSSPlugin({
-            content: ["**/*.js", "**/*.html", "**/*.templ"],
+            content: ["**/*.templ", "**/*.ts"],
             skippedContentGlobs: ["node_modules/**", "tests/**", "tmp/**"],
             variables: true,
             safelist: {
                 greedy: [/^svgMap-/],
-                variables: [
-                    "--bs-primary",
-                    "--bs-body-color",
-                    "--bs-body-bg",
-                    "--bs-secondary-bg",
-                    "--bs-secondary-color",
-                    "--bs-border-color",
-                    "--bs-link-hover-color",
-                ],
+                // --bs-primary is only consumed via getPropertyValue() in country-map.ts
+                // and never referenced in a CSS var() expression, so PurgeCSS cannot
+                // detect it automatically and it must be safelisted explicitly.
+                variables: ["--bs-primary"],
             },
         }),
         cssnano({ preset: ["cssnano-preset-advanced"] }),