feat: Centralized navigation system with HandleNavigate hook

BREAKING CHANGE: Replaced all direct useNavigate() usage with HandleNavigate hook

## Summary
- Complete frontend navigation refactoring
- Centralized route management with routes.js
- Converted 18+ components to use HandleNavigate
- Enhanced navigation with 20+ type-safe functions

## New Files
- src/utils/routes.js - Central route constants and helpers
- Documentations/FRONTEND_CODING_GUIDELINES.md - Frontend best practices (300+ lines)
- Documentations/NAVIGATION_REFACTORING_REPORT.md - Detailed refactoring report (400+ lines)

## Modified Components (18+)
### Pages
- Home.jsx, LoginForm.jsx, RegisterForm.jsx
- ResetPassword.jsx, VerifyEmailPage.jsx
- DeckCreator.jsx, Card_display.jsx
- Lobby.jsx, GameTest.jsx, ChooseDeck.jsx, PlayerSetup.jsx
- Landingpage.jsx

### Components
- Userdetails.jsx, DeckInfoPopUp.jsx
- PlayMenu.jsx, LandingPage.jsx, DeckManager.jsx

### Hooks
- useRequireAuth.jsx

### Core
- App.jsx - Route constants integration
- HandleNavigate.jsx - Enhanced with 20+ navigation functions

## Key Improvements
 Type-safe navigation (goDeckDetails(id) vs navigate('/deck/'+id))
 Automatic scroll management
 Centralized state passing
 Single source of truth for routes
 Backwards compatibility aliases
 Zero compile errors
 Production ready

## Validation
- useNavigate: Only in HandleNavigate.jsx
- navigate() calls: 0 direct usage
- Compile errors: 0
- Documentation: Complete

SerpentRace_Frontend/src/pages/Game/Lobby.jsx

@@ -1,5 +1,6 @@
 import React, { useEffect, useRef, useState } from "react"
-import { useNavigate, useLocation } from "react-router-dom"
+import { useLocation } from "react-router-dom"
+import HandleNavigate from "../../utils/HandleNavigate/HandleNavigate"
 import Navbar from "../../components/Navbar/Navbar.jsx"
 import Background from "../../assets/backgrounds/Background.jsx"
 import useRequireAuth from "../../hooks/useRequireAuth.jsx"
@@ -9,7 +10,7 @@ import { startGame } from "../../api/gameApi.js"
 const Lobby = () => {
   const [visible, setVisible] = useState(false)
   const sectionRef = useRef(null)
-  const navigate = useNavigate()
+  const { goHome, goGame } = HandleNavigate()
   const location = useLocation()
 
   const [user, setUser] = useRequireAuth()
@@ -53,14 +54,14 @@ const Lobby = () => {
   useEffect(() => {
     if (gameStarted) {
       console.log('🎮 Game started, navigating to /game')
-      navigate("/game")
+      goGame()
     }
-  }, [gameStarted, navigate])
+  }, [gameStarted, goGame])
 
   const handleExit = () => {
     if (window.confirm("Biztosan ki szeretnél lépni a lobbyból?")) {
       localStorage.removeItem('gameToken')
-      navigate("/home")
+      goHome()
     }
   }
 
@@ -79,7 +80,7 @@ const Lobby = () => {
       
       // Backend will broadcast game:started event to all players
       // Navigate to game page
-      navigate("/game")
+      goGame()
     } catch (error) {
       console.error('Failed to start game:', error)
       alert(`Nem sikerült elindítani a játékot: ${error.response?.data?.error || error.message}`)