Fix icon drag bounds on x-axis

Prevent icons from being dragged beyond viewport boundaries on the x-axis.
Icons are now clamped to valid positions during drag, not just on drop.

- Added viewport bounds checking for both x and y axes during drag
- Icons stay within [0, viewport.width - iconWidth] horizontally
- Icons stay within [0, viewport.height - iconHeight] vertically
- Eliminates snap-back behavior when dragging near edges

Bump version to 0.1.8

package.json

@@ -1,7 +1,7 @@
 {
   "name": "haex-hub",
   "private": true,
-  "version": "0.1.7",
+  "version": "0.1.8",
   "type": "module",
   "scripts": {
     "build": "nuxt build",