v1.0.3: Fix expression textbox error state and UI consistency

- Fixed theme class application from html to body element for proper CSS inheritance
- Removed CSS conflicts between base styles and error/success states
- Fixed focus state interference with error/success background colors
- Changed error message panel to fixed placement (no more UI jumping)
- Added theme-consistent styling for alert-success in all theme modes
- Expression textbox now properly shows red/green backgrounds in manual themes
- Status message now shows Expression is correct vs error message consistently

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jmespath-playground",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "A React-based web application for testing JMESPath expressions against JSON data",
   "main": "index.js",
   "scripts": {