feat(smart-app): implement complete mobile app MVP

- App.tsx: full navigation (Auth stack + Main tabs with 5 screens)
- Auth: LoginScreen, RegisterScreen, ForgotPasswordScreen
- HomeScreen: dashboard with IoT metrics, weather widget, alerts, quick actions, sensors
- MapScreen: interactive map with layer toggles (6 layers)
- MarketplaceScreen: categories (6), products (5), search
- ChatScreen: AI chat with quick prompts (4), bot responses
- ProfileScreen: user info, stats, menu (9 items), logout
- AlertsScreen: alert list with severity, acknowledge
- SensorsScreen: sensor list with type filters (6 types), search
- ZonesScreen: zone cards with stats
- SettingsScreen: language picker (FR/EN/ES/DE), privacy, about
- Stores: iotStore (sensors, zones, alerts), notificationStore, uiStore + i18n
- Hooks: useSensors, useAlerts, useNotifications, useLocation
- Components: Card, Button, LoadingSpinner, ErrorBoundary, Header
- Services: iotService, notificationService (with axios API client)
- Utils: formatters (temp, AQI, noise, dates), validators (email, password, IBAN)
- Theme: colors.ts with full design system (Blue Ocean palette)
- Ditto: fixed MongoDB connection, new JWT secrets, official gateway image

smart-app-city/frontend/node_modules/graphql/validation/rules/VariablesInAllowedPositionRule.mjs

@@ -0,0 +1,72 @@
+import inspect from "../../jsutils/inspect.mjs";
+import { GraphQLError } from "../../error/GraphQLError.mjs";
+import { Kind } from "../../language/kinds.mjs";
+import { isNonNullType } from "../../type/definition.mjs";
+import { typeFromAST } from "../../utilities/typeFromAST.mjs";
+import { isTypeSubTypeOf } from "../../utilities/typeComparators.mjs";
+
+/**
+ * Variables passed to field arguments conform to type
+ */
+export function VariablesInAllowedPositionRule(context) {
+  var varDefMap = Object.create(null);
+  return {
+    OperationDefinition: {
+      enter: function enter() {
+        varDefMap = Object.create(null);
+      },
+      leave: function leave(operation) {
+        var usages = context.getRecursiveVariableUsages(operation);
+
+        for (var _i2 = 0; _i2 < usages.length; _i2++) {
+          var _ref2 = usages[_i2];
+          var node = _ref2.node;
+          var type = _ref2.type;
+          var defaultValue = _ref2.defaultValue;
+          var varName = node.name.value;
+          var varDef = varDefMap[varName];
+
+          if (varDef && type) {
+            // A var type is allowed if it is the same or more strict (e.g. is
+            // a subtype of) than the expected type. It can be more strict if
+            // the variable type is non-null when the expected type is nullable.
+            // If both are list types, the variable item type can be more strict
+            // than the expected item type (contravariant).
+            var schema = context.getSchema();
+            var varType = typeFromAST(schema, varDef.type);
+
+            if (varType && !allowedVariableUsage(schema, varType, varDef.defaultValue, type, defaultValue)) {
+              var varTypeStr = inspect(varType);
+              var typeStr = inspect(type);
+              context.reportError(new GraphQLError("Variable \"$".concat(varName, "\" of type \"").concat(varTypeStr, "\" used in position expecting type \"").concat(typeStr, "\"."), [varDef, node]));
+            }
+          }
+        }
+      }
+    },
+    VariableDefinition: function VariableDefinition(node) {
+      varDefMap[node.variable.name.value] = node;
+    }
+  };
+}
+/**
+ * Returns true if the variable is allowed in the location it was found,
+ * which includes considering if default values exist for either the variable
+ * or the location at which it is located.
+ */
+
+function allowedVariableUsage(schema, varType, varDefaultValue, locationType, locationDefaultValue) {
+  if (isNonNullType(locationType) && !isNonNullType(varType)) {
+    var hasNonNullVariableDefaultValue = varDefaultValue != null && varDefaultValue.kind !== Kind.NULL;
+    var hasLocationDefaultValue = locationDefaultValue !== undefined;
+
+    if (!hasNonNullVariableDefaultValue && !hasLocationDefaultValue) {
+      return false;
+    }
+
+    var nullableLocationType = locationType.ofType;
+    return isTypeSubTypeOf(schema, varType, nullableLocationType);
+  }
+
+  return isTypeSubTypeOf(schema, varType, locationType);
+}