fix(dapp): pin @reown/appkit to 1.7.5 to restore connect modal compatibility (#989)

The AppKit modal rendered by ^1.8.17 uses shadow DOM in a way that
breaks Playwright test automation (locators cannot find modal elements).
Pin to 1.7.5 to restore testability until a compatible upgrade path is
available.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: ganchoradkov

advanced/dapps/react-dapp-v2/package.json

@@ -18,7 +18,7 @@
     "@noble/curves": "^2.0.0",
     "@noble/hashes": "^2.0.0",
     "@polkadot/util-crypto": "^14.0.0",
-    "@reown/appkit": "^1.8.17",
+    "@reown/appkit": "1.7.5",
     "@solana/web3.js": "^1.98.4",
     "@stacks/transactions": "^7.3.1",
     "@ton/core": "^0.63.0",