adding web flasher tool

flash_tool/build_web_macos.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# Build script for macOS executable (Web-based UI)
+
+echo "=== ESP32 Flasher (Web UI) - macOS Build Script ==="
+echo ""
+
+# Check if running on macOS
+if [[ "$OSTYPE" != "darwin"* ]]; then
+    echo "❌ Error: This script is for macOS only."
+    echo "   Use build_web_windows.bat on Windows."
+    exit 1
+fi
+
+# Create virtual environment if it doesn't exist
+if [ ! -d "venv" ]; then
+    echo "Creating virtual environment..."
+    python3 -m venv venv
+fi
+
+echo "Activating virtual environment..."
+source venv/bin/activate
+
+echo "Installing dependencies..."
+pip install -r requirements.txt
+
+echo ""
+echo "Building macOS application bundle..."
+pyinstaller ESP32_WebFlasher_macOS.spec
+
+echo ""
+if [ -d "dist/ESP32_Flasher.app" ]; then
+    echo "✓ Build complete!"
+    echo ""
+    echo "Application created at: dist/ESP32_Flasher.app"
+    echo ""
+    echo "To run the application:"
+    echo "  open dist/ESP32_Flasher.app"
+    echo ""
+    echo "The app will open in your default web browser!"
+else
+    echo "❌ Build failed - application not found in dist folder"
+    exit 1
+fi