Hardcoded appName cake_wallet -> hash_wallet + nuke changelog modal + Wownero up top

Three semi-independent fixes flagged from a user-facing testing pass:

1. cw_core/lib/root_dir.dart had a hardcoded 'cake_wallet' for the
   Linux app data dir, bypassing the binary name entirely. That's why
   ~/.config/cake_wallet/ kept being created even after the project
   rename. Changed appName const to hash_wallet. Also:
   - CAKE_WALLET_DIR env-var override -> HASH_WALLET_DIR (with the
     old name kept as a fallback so users migrating from a Cake
     install via env-var don't lose their path).
   - linuxSymlinkSharedPreferences kept the legacy
     ['com.example.cake_wallet','cake_wallet'] paths in the migration
     array so existing Cake users get auto-migrated into hash_wallet's
     new home on first launch of the fork.

2. lib/new-ui/new_dashboard.dart: commented out the
   Future.delayed(300ms).then(_showChangelog) trigger. The changelog
   content lives under assets/new-ui/changelog/text and describes
   Cake's v6.1.0 release notes — not ours. The 'View more info' button
   inside the modal launched blog.cakewallet.com. Re-enable once we
   write our own changelog content.

3. tool/configure.dart: WalletType.wownero hoisted to the top of the
   generated availableWalletTypes list. It's the reason this fork
   exists, so it should be the first choice in create / restore
   pickers. Monero stays as #2.

tool/configure.dart

@@ -1956,6 +1956,11 @@ Future<void> generateWalletTypes({
   const outputDefinition = 'final availableWalletTypes = <WalletType>[';
   var outputContent = outputHeader + '\n\n' + outputDefinition + '\n';
 
+  // Hash Wallet: Wownero up top — it's the reason this fork exists.
+  if (hasWownero) {
+    outputContent += '\tWalletType.wownero,\n';
+  }
+
   if (hasMonero) {
     outputContent += '\tWalletType.monero,\n';
   }
@@ -2024,9 +2029,7 @@ Future<void> generateWalletTypes({
     outputContent += '\tWalletType.banano,\n';
   }
 
-  if (hasWownero) {
-    outputContent += '\tWalletType.wownero,\n';
-  }
+  // (Wownero moved to the top of this list — see comment above.)
 
   outputContent += '];\n';
   await walletTypesFile.writeAsString(outputContent);