fix: add validation for localStorage theme values

src/context/ThemeContext.jsx

@@ -3,13 +3,33 @@ import { createContext, useContext, useState, useEffect } from 'react'
 const ThemeCtx = createContext(null)
 
 export function ThemeProvider({ children }) {
+
   const [theme, setTheme] = useState(() => {
-    return localStorage.getItem('oe_theme') || 'dark'
+    try {
+      const stored = localStorage.getItem('oe_theme')
+
+      if (stored === 'dark' || stored === 'light') {
+        return stored
+      }
+
+      if (stored !== null) {  
+        console.warn(`Invalid theme value found in localStorage: "${stored}". Falling back to 'dark'.`)
+      }
+
+    } catch (error) {
+      console.warn('Failed to read theme from localStorage:', error)
+    }
+
+    return 'dark'
   })
 
   useEffect(() => {
     document.documentElement.setAttribute('data-theme', theme)
-    localStorage.setItem('oe_theme', theme)
+    try {
+      localStorage.setItem('oe_theme', theme)
+    } catch (error) {
+      console.warn('Failed to save theme to localStorage:', error)
+    }
   }, [theme])
 
   const toggleTheme = () => {