feat(perps): integrate Lighter with funded Lite order entry

.js.env.example

@@ -235,6 +235,14 @@ export MM_PERPS_GTM_MODAL_ENABLED="true"
 export MM_PERPS_ORDER_BOOK_ENABLED="true"
 export MM_PERPS_FEEDBACK_ENABLED="true"
 export MM_PERPS_RELATED_MARKETS_ENABLED="true"
+# Build-time opt-in, including local dev. False excludes the embedded signer.
+# Restart Metro with a cleared cache after changing this flag.
+export MM_PERPS_LIGHTER_PROVIDER_ENABLED="false"
+# Optional Lighter testnet account override: decimal integer 0..9007199254740991.
+# Empty selects normal account discovery; malformed enabled overrides fail configuration.
+export MM_PERPS_LIGHTER_ACCOUNT_INDEX_TESTNET=""
+# Optional signer key slot: decimal integer 0..254. Empty uses the controller default.
+export MM_PERPS_LIGHTER_API_KEY_INDEX=""
 export MM_PERPS_MYX_PROVIDER_ENABLED="true"
 export MM_PERPS_MYX_APP_ID_TESTNET=""
 export MM_PERPS_MYX_API_SECRET_TESTNET=""

app/__mocks__/lighterSignerHtml.ts

@@ -0,0 +1 @@
+export default '<html />';