chore: add ESLint (expo flat config) + Prettier

.prettierignore

@@ -0,0 +1,10 @@
+node_modules/
+android/
+ios/
+dist/
+.expo/
+Safekeep/
+assets/
+coverage/
+package-lock.json
+supabase/functions/

.prettierrc

@@ -0,0 +1,8 @@
+{
+  "singleQuote": true,
+  "semi": true,
+  "tabWidth": 2,
+  "printWidth": 100,
+  "trailingComma": "es5",
+  "arrowParens": "always"
+}

App.js

@@ -39,9 +39,8 @@ import { Ionicons } from '@expo/vector-icons';
 import { ThemeProvider, useTheme } from './context/ThemeContext';
 import dataRefreshManager from './utils/DataRefreshManager';
 import { NotificationService } from './services/NotificationService';
-import { UserProvider } from './context/UserContext';
+import { UserProvider , useUser } from './context/UserContext';
 import SubscriptionService from './services/SubscriptionService';
-import { useUser } from './context/UserContext';
 import BadgeEarnedModal from './components/shared/BadgeEarnedModal';
 import WeeklyReviewModal from './components/shared/WeeklyReviewModal';
 import { navigationRef } from './utils/NavigationService';

eslint.config.js

@@ -0,0 +1,32 @@
+// https://docs.expo.dev/guides/using-eslint/
+const { defineConfig } = require('eslint/config');
+const expoConfig = require('eslint-config-expo/flat');
+const eslintConfigPrettier = require('eslint-config-prettier');
+
+module.exports = defineConfig([
+  expoConfig,
+  // Disable stylistic rules that conflict with Prettier (Prettier owns formatting).
+  eslintConfigPrettier,
+  {
+    ignores: [
+      'dist/*',
+      'android/*',
+      'ios/*',
+      '.expo/*',
+      'Safekeep/*',
+      'scripts/*',
+      'assets/*',
+      'supabase/functions/*', // Deno runtime — linted separately, not with the Expo config
+    ],
+  },
+  {
+    rules: {
+      // Metro/TypeScript resolve these imports (e.g. @expo/vector-icons); the
+      // import plugin's resolver does not understand RN/Expo module resolution,
+      // so it produces false positives. Genuinely missing modules fail the build.
+      'import/no-unresolved': 'off',
+      // Apostrophes and quotes in JSX copy are fine in React Native UIs.
+      'react/no-unescaped-entities': 'off',
+    },
+  },
+]);

hooks/useStepCount.ts

@@ -3,6 +3,9 @@ import { Platform, NativeModules, AppState, AppStateStatus } from 'react-native'
 import { supabase } from '../supabaseClient';
 import { AchievementService } from '../services/AchievementService';
 
+import { HealthValue, HealthKitPermissions } from 'react-native-health';
+import { initialize, requestPermission, readRecords } from 'react-native-health-connect';
+
 // Fix: Use require for CommonJS module + Manual Patch for New Architecture
 const AppleHealthKit = require('react-native-health');
 
@@ -14,9 +17,6 @@ if (Platform.OS === 'ios' && !AppleHealthKit.initHealthKit && NativeModules.Appl
     AppleHealthKit.getSamples = NativeModules.AppleHealthKit.getSamples;
 }
 
-import { HealthValue, HealthKitPermissions } from 'react-native-health';
-import { initialize, requestPermission, readRecords } from 'react-native-health-connect';
-
 export interface ExternalActivity {
     type: string;
     duration: number; // in seconds
@@ -74,7 +74,7 @@ export const useStepCount = (): StepCountData => {
                         includeManuallyAdded: true,
                     };
 
-                    HealthKit.getStepCount(stepOptions, (stepErr: Object, stepResult: HealthValue) => {
+                    HealthKit.getStepCount(stepOptions, (stepErr: object, stepResult: HealthValue) => {
                         if (!stepErr) {
                             setSteps(stepResult.value);
                         }
@@ -90,7 +90,7 @@ export const useStepCount = (): StepCountData => {
 
                     // Use getAnchoredWorkouts for actual HKWorkout objects
                     if (HealthKit.getAnchoredWorkouts) {
-                        HealthKit.getAnchoredWorkouts(workoutOptions, (workoutErr: Object, response: any) => {
+                        HealthKit.getAnchoredWorkouts(workoutOptions, (workoutErr: object, response: any) => {
                             // response is { anchor: string, data: [...] } or just [...] depending on version, usually { data: ... }
                             if (workoutErr) {
                                 console.error('Error fetching workouts (anchored):', workoutErr);