refactor: corrige duplicações e código morto

- Remove Toast Manager duplicado (core/toast-manager.js)
- Unifica loadPreferences/savePreferences de app.js para state.js
- Unifica adminConfig de app.js para state.js
- Remove código morto (if false block)
- Adiciona checkStorage para validar localStorage

public/js/core/state.js

@@ -15,13 +15,34 @@ export const appState = {
 };
 
 // User preferences (persisted to localStorage)
-export const userPreferences = {
+export let userPreferences = {
     theme: 'dark',
-    colorScheme: 'default', // default, blue, green, purple, orange
-    fontSize: 'medium', // small, medium, large, xlarge
-    fontFamily: 'default' // default, modern, classic, mono
+    colorScheme: 'default',
+    fontSize: 'medium',
+    fontFamily: 'default'
 };
 
+// Load preferences from localStorage
+export function loadPreferences() {
+    try {
+        const saved = localStorage.getItem('acoCalcPreferences');
+        if (saved) {
+            userPreferences = { ...userPreferences, ...JSON.parse(saved) };
+        }
+    } catch (e) {
+        console.warn('Não foi possível carregar preferências:', e);
+    }
+}
+
+// Save preferences to localStorage
+export function savePreferences() {
+    try {
+        localStorage.setItem('acoCalcPreferences', JSON.stringify(userPreferences));
+    } catch (e) {
+        console.warn('Não foi possível salvar preferências:', e);
+    }
+}
+
 // Admin configuration
 export const adminConfig = {
     appName: 'SteelBase',
@@ -89,3 +110,26 @@ export function updatePreference(key, value) {
 export function getPreference(key) {
     return userPreferences[key];
 }
+
+/**
+ * Check if localStorage is available and has space
+ * @returns {object} Storage status
+ */
+export function checkStorage() {
+    try {
+        const testKey = '__storage_test__';
+        localStorage.setItem(testKey, testKey);
+        localStorage.removeItem(testKey);
+        
+        let totalSize = 0;
+        for (let key in localStorage) {
+            if (localStorage.hasOwnProperty(key)) {
+                totalSize += localStorage[key].length * 2;
+            }
+        }
+        
+        return { available: true, usedBytes: totalSize };
+    } catch (error) {
+        return { available: false, error: error.message };
+    }
+}

public/js/core/toast-manager.js

@@ -1,228 +0,0 @@
-/**
- * ToastManager - Sistema de Notificações Visuais
- * Gerencia notificações toast não-intrusivas para o usuário
- */
-class ToastManager {
-    constructor() {
-        this.container = null;
-        this.toasts = new Map();
-        this.config = {
-            position: 'top-right',
-            duration: 5000,
-            maxToasts: 5,
-            animationDuration: 300
-        };
-        this.init();
-    }
-
-    init() {
-        this.createContainer();
-        console.log('🍞 ToastManager inicializado');
-    }
-
-    createContainer() {
-        // Remover container existente se houver
-        const existingContainer = document.querySelector('.toast-container');
-        if (existingContainer) {
-            existingContainer.remove();
-        }
-
-        // Criar novo container
-        this.container = document.createElement('div');
-        this.container.className = `toast-container toast-${this.config.position}`;
-        this.container.style.cssText = `
-            position: fixed;
-            z-index: 10000;
-            pointer-events: none;
-        `;
-
-        // Definir posição baseada na configuração
-        this.setContainerPosition();
-        
-        document.body.appendChild(this.container);
-    }
-
-    setContainerPosition() {
-        if (!this.container) return;
-
-        const positions = {
-            'top-right': { top: '20px', right: '20px', bottom: 'auto', left: 'auto' },
-            'top-left': { top: '20px', left: '20px', bottom: 'auto', right: 'auto' },
-            'top-center': { top: '20px', left: '50%', transform: 'translateX(-50%)', bottom: 'auto', right: 'auto' },
-            'bottom-right': { bottom: '20px', right: '20px', top: 'auto', left: 'auto' },
-            'bottom-left': { bottom: '20px', left: '20px', top: 'auto', right: 'auto' },
-            'bottom-center': { bottom: '20px', left: '50%', transform: 'translateX(-50%)', top: 'auto', right: 'auto' }
-        };
-
-        const pos = positions[this.config.position] || positions['top-right'];
-        Object.assign(this.container.style, pos);
-    }
-
-    show(message, type = 'info', duration = null, options = {}) {
-        const toast = this.createToast(message, type, options);
-        const toastId = toast.dataset.toastId;
-        
-        // Adicionar ao container
-        this.container.appendChild(toast);
-        
-        // Armazenar referência
-        this.toasts.set(toastId, toast);
-        
-        // Limitar número de toasts
-        this.limitToasts();
-        
-        // Animar entrada
-        requestAnimationFrame(() => {
-            toast.classList.add('show');
-        });
-        
-        // Configurar tempo de remoção
-        const autoHideDuration = duration !== null ? duration : this.config.duration;
-        if (autoHideDuration > 0) {
-            setTimeout(() => {
-                this.hide(toastId);
-            }, autoHideDuration);
-        }
-        
-        return toastId;
-    }
-
-    createToast(message, type, options) {
-        const toast = document.createElement('div');
-        const toastId = 'toast_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
-        
-        toast.dataset.toastId = toastId;
-        toast.className = `toast toast-${type}`;
-        toast.style.cssText = `
-            background: var(--toast-bg, #333);
-            color: var(--toast-color, #fff);
-            padding: 16px 20px;
-            margin-bottom: 10px;
-            border-radius: 8px;
-            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
-            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-            font-size: 14px;
-            line-height: 1.4;
-            max-width: 400px;
-            min-width: 300px;
-            opacity: 0;
-            transform: translateX(100%);
-            transition: all ${this.config.animationDuration}ms ease;
-            pointer-events: auto;
-            position: relative;
-            overflow: hidden;
-        `;
-
-        // Definir cores baseadas no tipo
-        const colors = {
-            success: { bg: '#22c55e', color: '#fff' },
-            error: { bg: '#ef4444', color: '#fff' },
-            warning: { bg: '#f59e0b', color: '#fff' },
-            info: { bg: '#3b82f6', color: '#fff' }
-        };
-
-        const colorConfig = colors[type] || colors.info;
-        toast.style.setProperty('--toast-bg', colorConfig.bg);
-        toast.style.setProperty('--toast-color', colorConfig.color);
-
-        // Adicionar ícone baseado no tipo
-        const icons = {
-            success: '✅',
-            error: '❌',
-            warning: '⚠️',
-            info: 'ℹ️'
-        };
-
-        const icon = options.icon || icons[type] || icons.info;
-        
-        toast.innerHTML = `
-            <div style="display: flex; align-items: flex-start; gap: 12px;">
-                <span style="font-size: 16px; flex-shrink: 0;">${icon}</span>
-                <div style="flex: 1;">${message}</div>
-                <button onclick="toastManager.hide('${toastId}')" style="
-                    background: none;
-                    border: none;
-                    color: inherit;
-                    font-size: 18px;
-                    cursor: pointer;
-                    padding: 0;
-                    margin-left: 8px;
-                    opacity: 0.7;
-                    transition: opacity 0.2s;
-                " onmouseover="this.style.opacity=1" onmouseout="this.style.opacity=0.7">×</button>
-            </div>
-        `;
-
-        return toast;
-    }
-
-    limitToasts() {
-        if (this.toasts.size <= this.config.maxToasts) return;
-        
-        const toastsArray = Array.from(this.toasts.entries());
-        const toRemove = toastsArray.slice(0, toastsArray.length - this.config.maxToasts);
-        
-        toRemove.forEach(([toastId]) => {
-            this.hide(toastId);
-        });
-    }
-
-    hide(toastId) {
-        const toast = this.toasts.get(toastId);
-        if (!toast) return;
-        
-        toast.classList.remove('show');
-        
-        setTimeout(() => {
-            if (toast.parentNode) {
-                toast.parentNode.removeChild(toast);
-            }
-            this.toasts.delete(toastId);
-        }, this.config.animationDuration);
-    }
-
-    hideAll() {
-        this.toasts.forEach((toast, toastId) => {
-            this.hide(toastId);
-        });
-    }
-
-    // Métodos de conveniência
-    success(message, duration, options) {
-        return this.show(message, 'success', duration, options);
-    }
-
-    error(message, duration, options) {
-        return this.show(message, 'error', duration, options);
-    }
-
-    warning(message, duration, options) {
-        return this.show(message, 'warning', duration, options);
-    }
-
-    info(message, duration, options) {
-        return this.show(message, 'info', duration, options);
-    }
-
-    // Configurar posição
-    setPosition(position) {
-        if (['top-right', 'top-left', 'top-center', 'bottom-right', 'bottom-left', 'bottom-center'].includes(position)) {
-            this.config.position = position;
-            this.createContainer();
-        }
-    }
-
-    // Obter estatísticas
-    getStats() {
-        return {
-            activeToasts: this.toasts.size,
-            maxToasts: this.config.maxToasts,
-            position: this.config.position,
-            duration: this.config.duration
-        };
-    }
-}
-
-// Tornar disponível globalmente
-window.ToastManager = ToastManager;
-window.toastManager = new ToastManager();