Improve install script

Author: ufechner7

bin/install

@@ -226,6 +226,21 @@ else
     exit 1
 fi
 
+# Bootstrap LocalPreferences.toml for subprojects that need PythonCall.
+# Only copies the .default if no LocalPreferences.toml exists yet (e.g. fresh
+# clone). A subsequent run of bin/install_controlplots will add or update the
+# machine-specific settings on top.
+echo
+echo "Bootstrapping LocalPreferences.toml for subprojects..."
+for _lp_dir in examples_cp test; do
+    _lp_file="${_lp_dir}/LocalPreferences.toml"
+    _lp_default="${_lp_dir}/LocalPreferences.toml.default"
+    if [[ ! -f "$_lp_file" && -f "$_lp_default" ]]; then
+        cp "$_lp_default" "$_lp_file"
+        echo "  Created ${_lp_file} from default (CondaPkg disabled)."
+    fi
+done
+
 $_julia_cmd --project=. -e 'using Pkg; Pkg.precompile(); Pkg.activate("examples"); Pkg.precompile();
 Pkg.activate("examples_cp"); Pkg.precompile(); Pkg.activate("test"); Pkg.precompile();
 @info "Precompilation complete."'

examples_cp/LocalPreferences.toml.default

@@ -0,0 +1,5 @@
+[CondaPkg]
+backend = "Null"
+
+[ENV]
+MPLBACKEND = "qtagg"

test/LocalPreferences.toml.default

@@ -0,0 +1,2 @@
+[CondaPkg]
+backend = "Null"