feat: Add eslint

[StoynovAngel]

Summary by CodeRabbit

• Chores
  • Added ESLint configuration and linting tools for improved code quality and consistency.
  • Refactored imports for better TypeScript type safety and runtime optimization.
  • Standardized promise handling patterns and code organization across the application.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 97ddc1a8-2d35-42ea-bfd2-3a4f6e281299

📥 Commits

Reviewing files that changed from the base of the PR and between 13fc02a and 1b88b76.

⛔ Files ignored due to path filters (1)

• frontend/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (29)

• frontend/App.tsx
• frontend/app.config.ts
• frontend/eslint.config.js
• frontend/package.json
• frontend/src/components/AccessibilityMenu/AccessibilityMenu.styles.ts
• frontend/src/components/AccessibilityMenu/AccessibilityMenu.tsx
• frontend/src/components/BackButton/BackButton.styles.ts
• frontend/src/components/BackgroundShapes/BackgroundShapes.tsx
• frontend/src/components/CompanyCard/CompanyCard.styles.ts
• frontend/src/components/GlassCard/GlassCard.styles.ts
• frontend/src/components/GlassCard/GlassCard.tsx
• frontend/src/components/LogoutButton/LogoutButton.styles.ts
• frontend/src/components/ScreenContainer/ScreenContainer.styles.ts
• frontend/src/components/ScreenContainer/ScreenContainer.tsx
• frontend/src/components/SearchInput/SearchInput.styles.ts
• frontend/src/hooks/useAuthState.ts
• frontend/src/hooks/useTranslation.ts
• frontend/src/navigation/MainTabs.tsx
• frontend/src/navigation/RootNavigator.styles.ts
• frontend/src/navigation/navigation.styles.ts
• frontend/src/screens/BrowseCompanies/BrowseCompaniesScreen.styles.ts
• frontend/src/screens/Login/LoginScreen.styles.ts
• frontend/src/screens/Register/RegisterScreen.styles.ts
• frontend/src/screens/SelectService/SelectServiceScreen.styles.ts
• frontend/src/screens/ServiceOptions/ServiceOptionsScreen.styles.ts
• frontend/src/stores/authStore.ts
• frontend/src/stores/localeStore.ts
• frontend/src/stores/themeStore.ts
• frontend/src/stores/token.ts

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📝 Walkthrough

Walkthrough

This PR systematically introduces ESLint configuration for the frontend project, converts type-related imports to type-only imports across numerous files, adds explicit void expressions to intentionally discard promise values, refactors navigation styles, and makes minor logic adjustments for consistency.

Changes

Cohort / File(s)	Summary
ESLint Configuration frontend/eslint.config.js, frontend/package.json	Adds comprehensive ESLint flat configuration with TypeScript, React, React Hooks, and React Native support; includes npm scripts for lint and lint:fix; specifies plugins, rules, and dev dependencies.
Type-Only Import Conversions frontend/app.config.ts, frontend/src/components/AccessibilityMenu/*, frontend/src/components/BackButton/BackButton.styles.ts, frontend/src/components/CompanyCard/CompanyCard.styles.ts, frontend/src/components/GlassCard/*, frontend/src/components/LogoutButton/LogoutButton.styles.ts, frontend/src/components/ScreenContainer/*, frontend/src/components/SearchInput/SearchInput.styles.ts, frontend/src/navigation/RootNavigator.styles.ts, frontend/src/screens/.../*.styles.ts, frontend/src/stores/themeStore.ts	Systematically converts ThemeColors, ReactNode, StyleProp, ViewStyle, TextStyle, and related type imports to TypeScript type-only imports across components, screens, and stores to ensure types are not emitted in runtime JavaScript.
Promise Handling (void expressions) frontend/App.tsx, frontend/src/hooks/useAuthState.ts, frontend/src/stores/authStore.ts, frontend/src/stores/localeStore.ts, frontend/src/stores/themeStore.ts	Explicitly discards returned promise values by wrapping async calls in void expressions (e.g., void hydrateLocale(), void (async () => { ... })()) instead of leaving them unhandled.
Navigation Refactoring frontend/src/navigation/navigation.styles.ts, frontend/src/navigation/MainTabs.tsx	Adds new mainContentStyles StyleSheet with container layout; adds logo style (36×36) to island header styles; updates MainTabs to use memoized computed header styles and applies styled container wrapper.
Minor Logic & Hook Updates frontend/src/hooks/useAuthState.ts, frontend/src/hooks/useTranslation.ts, frontend/src/stores/token.ts	Changes boolean coercion from !!token to Boolean(token), replaces nullish check from == null to explicit === null || === undefined, and removes async keyword from getToken (returns promise directly).
ESLint Directive frontend/src/components/BackgroundShapes/BackgroundShapes.tsx	Adds targeted ESLint disable directive to allow inline style objects without triggering react-native/no-inline-styles rule.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Possibly related PRs

• feat: Add logo, update navigation #53: Modifies the same navigation files (MainTabs.tsx and navigation.styles.ts) to adjust island/header and logo styles, indicating related or overlapping layout work.
• feat: Improve Home Screen #38: Updates theme store and related UI components (BackgroundShapes, toggleBlobs), with this PR adding ESLint ignore and promise handling in similar areas.
• feat: Add initial frontend #33: Makes follow-up code-style improvements and promise-handling edits across many of the same frontend files originally added by that PR.

Poem

🐰 Types now whisper, promises void,
ESLint's rules for joy deployed,
Navigation styles arranged just right,
The code hops forward, clean and bright! ✨

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/add-es-lint

⚔️ Resolve merge conflicts

• Resolve merge conflict in branch feat/add-es-lint

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