Add comprehensive Electron build system and documentation

- Updated electron-builder.config.json with proper TimeSafari metadata
- Added Linux package support (AppImage, deb, rpm)
- Created build-packages.sh script for easy package building
- Added npm scripts for building from project root
- Created comprehensive README-BUILDING.md documentation
- Fixed package.json metadata (author, homepage, repository)
- Added maintainer information for Linux packages

Features:
- AppImage: Portable, no installation required (~145MB)
- Debian package: System integration via package manager (~96MB)
- RPM package: Support for RPM-based distributions
- Build scripts support individual or all package types

Usage:
- npm run electron:build (all packages)
- npm run electron:build:appimage (AppImage only)
- npm run electron:build:deb (Debian package only)
- cd electron && ./build-packages.sh [type]

electron/build-packages.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# TimeSafari Electron Build Script
+# Usage: ./build-packages.sh [pack|appimage|deb|rpm|all]
+
+set -e
+
+echo "🚀 TimeSafari Electron Build Script"
+echo "=================================="
+
+# Build TypeScript and rebuild native modules
+echo "📦 Building TypeScript and native modules..."
+npm run build
+
+BUILD_TYPE="${1:-all}"
+
+case "$BUILD_TYPE" in
+  "pack")
+    echo "📦 Creating unpacked build..."
+    npx electron-builder build --dir -c ./electron-builder.config.json
+    ;;
+  "appimage")
+    echo "📦 Creating AppImage..."
+    npx electron-builder build --linux AppImage -c ./electron-builder.config.json
+    ;;
+  "deb")
+    echo "📦 Creating Debian package..."
+    npx electron-builder build --linux deb -c ./electron-builder.config.json
+    ;;
+  "rpm")
+    echo "📦 Creating RPM package..."
+    if ! command -v rpmbuild &> /dev/null; then
+      echo "⚠️  rpmbuild not found. Install with: sudo pacman -S rpm-tools"
+      exit 1
+    fi
+    npx electron-builder build --linux rpm -c ./electron-builder.config.json
+    ;;
+  "all")
+    echo "📦 Creating all Linux packages..."
+    npx electron-builder build --linux -c ./electron-builder.config.json
+    ;;
+  *)
+    echo "❌ Unknown build type: $BUILD_TYPE"
+    echo "Usage: $0 [pack|appimage|deb|rpm|all]"
+    exit 1
+    ;;
+esac
+
+echo ""
+echo "✅ Build completed successfully!"
+echo "📁 Output files in: ./dist/"
+echo ""
+echo "📦 Available packages:"
+ls -la dist/ | grep -E '\.(AppImage|deb|rpm)$' || echo "   No packages found"
+echo ""
+echo "🎉 Ready to distribute!"