feat: upgrade to ghostty-web 0.4.0-ime-fix from rcarmo/ghostty-web

- Vendor patched version with native theme/palette support at WASM level
- Remove color remapping patches (no longer needed)
- Pre-load Ghostty WASM before terminal creation
- Bundle size reduced from 1.16 MB to 0.67 MB
- Includes IME input fixes

Bump version to 0.7.0

package.json

@@ -3,7 +3,7 @@
   "private": true,
   "type": "module",
   "dependencies": {
-    "ghostty-web": "^0.1.0"
+    "ghostty-web": "github:rcarmo/ghostty-web"
   },
   "devDependencies": {
     "typescript": "^5.7.0"