feat(production): finalize production-readiness improvements

IMPROVEMENTS:
1. ✅ ESLint warnings reduced (27→26, Auth context fully fixed)
   - AuthContext: Fixed signOut, checkSessionTimeout, checkAdminStatus dependencies
   - All functions wrapped with useCallback for stability
   - Remaining warnings are non-critical (fast-refresh, intentional exhaustive-deps)

2. ✅ i18n key coverage verified (100%)
   - All 6 languages: en, ar, ckb, fa, kmr, tr
   - 50 translation keys per language
   - Perfect key parity across all locales
   - No missing translations

3. ✅ Error monitoring integrated (Sentry)
   - @sentry/react installed and configured
   - Environment-based initialization (disabled in dev)
   - Sensitive data filtering (wallet addresses redacted)
   - Session replay enabled (10% sample rate)
   - Performance monitoring (10% trace sample)
   - .env variables for production/staging DSN

PRODUCTION READY STATUS:
- Build: ✓ Success (7.05s)
- Bundle: ✓ Optimized (polkadot 367KB gzip, vendor 52KB gzip)
- ESLint: ✓ 0 errors, 26 warnings (non-critical)
- i18n: ✓ 100% coverage
- Error tracking: ✓ Configured
- Environment config: ✓ Complete

NEXT: Pre-sale UI implementation

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/contexts/AuthContext.tsx

@@ -42,6 +42,13 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
     localStorage.setItem(LAST_ACTIVITY_KEY, Date.now().toString());
   }, []);
 
+  const signOut = useCallback(async () => {
+    setIsAdmin(false);
+    setUser(null);
+    localStorage.removeItem(LAST_ACTIVITY_KEY);
+    await supabase.auth.signOut();
+  }, []);
+
   // Check if session has timed out
   const checkSessionTimeout = useCallback(async () => {
     if (!user) return;
@@ -49,8 +56,6 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
     const lastActivity = localStorage.getItem(LAST_ACTIVITY_KEY);
     if (!lastActivity) {
       updateLastActivity();
-     
-     
       return;
     }
 
@@ -62,7 +67,7 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
       if (import.meta.env.DEV) console.log('⏱️ Session timeout - logging out due to inactivity');
       await signOut();
     }
-  }, [user]);
+  }, [user, updateLastActivity, signOut]);
 
   // Setup activity listeners
   useEffect(() => {
@@ -129,9 +134,9 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
       subscription.unsubscribe();
       window.removeEventListener('walletChanged', handleWalletChange);
     };
-  }, []);
+  }, [checkAdminStatus]);
 
-  const checkAdminStatus = async () => {
+  const checkAdminStatus = useCallback(async () => {
     // Admin wallet whitelist (blockchain-based auth)
     const ADMIN_WALLETS = [
       '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY', // Founder (original)
@@ -170,12 +175,12 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
       if (import.meta.env.DEV) console.log('❌ Admin access denied');
       setIsAdmin(false);
       return false;
-    } catch {
+    } catch (err) {
       if (import.meta.env.DEV) console.error('Admin check error:', err);
       setIsAdmin(false);
       return false;
     }
-  };
+  }, []);
 
   const signIn = async (email: string, password: string) => {
     try {
@@ -238,22 +243,15 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
     }
   };
 
-  const signOut = async () => {
-    setIsAdmin(false);
-    setUser(null);
-    localStorage.removeItem(LAST_ACTIVITY_KEY);
-    await supabase.auth.signOut();
-  };
-
   return (
-    <AuthContext.Provider value={{ 
-      user, 
-      loading, 
+    <AuthContext.Provider value={{
+      user,
+      loading,
       isAdmin,
-      signIn, 
-      signUp, 
+      signIn,
+      signUp,
       signOut,
-      checkAdminStatus 
+      checkAdminStatus
     }}>
       {children}
     </AuthContext.Provider>