add de cosmic to new flake based approach

modules_old/de/cosmic/config/com.system76.CosmicComp/v1/input_default

@@ -0,0 +1,9 @@
+(
+    state: Enabled,
+    scroll_config: Some((
+        method: None,
+        natural_scroll: Some(true),
+        scroll_button: None,
+        scroll_factor: None,
+    )),
+)

modules_old/shell/common.sh

@@ -1,7 +1,11 @@
 # Check if ~/.config/environment exists and source all files within it
 if [ -d "$HOME/.config/environment" ]; then
   for file in "$HOME/.config/environment/"*; do
-    [ -r "$file" ] && . "$file"
+    if [ -r "$file" ]; then
+      if ! . "$file"; then
+        echo "Failed to source $file"
+      fi
+    fi
   done
 fi