feat: add theme size check script

Author: SayanthRock

scripts/check-theme-size.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+MAX_MB=5
+THEME_DIR="themes/default"
+
+if [ ! -d "$THEME_DIR" ]; then
+  echo "Theme folder not found: $THEME_DIR"
+  exit 1
+fi
+
+echo "Checking large theme assets in $THEME_DIR"
+find "$THEME_DIR" -type f \( -name "*.jpg" -o -name "*.jpeg" -o -name "*.png" -o -name "*.webp" -o -name "*.ogg" \) -print0 | while IFS= read -r -d '' file; do
+  size_mb=$(( ($(wc -c < "$file") + 1048575) / 1048576 ))
+  if [ "$size_mb" -gt "$MAX_MB" ]; then
+    echo "Large asset: $file (${size_mb}MB). Optimize it for smoother customer devices."
+  fi
+done
+
+echo "Theme asset check complete."