add biometric support for monero wallet open/create/restore, add monero settings card, fix monero logout to stop rpc

- Added moneroGetStoredPassword / moneroStorePassword keychain helpers
- moneroCreateWallet and moneroRestoreWallet accept storePw flag to save password to keychain
- moneroOpenExistingWallet accepts optional password (falls back to keychain lookup)
- Monero UI: 'Save password with Touch ID' checkbox hides password field, auto-generates random password, saves to keychain
- Monero UI: 'Open with Touch ID' button uses biometric auth + retrieves stored password
- Monero Settings card: enter wallet password to save with Touch ID for existing wallets
- logout() now async, calls moneroStop() to kill RPC process so re-login requires explicit wallet open

apps/desktop/src/lib/components/EvmDashboard.svelte

@@ -261,7 +261,7 @@
 						<Button variant="outline" onclick={() => navigate('/settings')}>
 							<SettingsIcon size={16} />
 						</Button>
-						<Button variant="outline" onclick={() => { w.logout(); navigate('/') }}>
+						<Button variant="outline" onclick={async () => { await w.logout(); navigate('/') }}>
 							Logout
 						</Button>
 					</div>