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/electron-builder.config.json

@@ -1,7 +1,9 @@
 {
-  "appId": "com.yourdoamnin.yourapp",
+  "appId": "app.timesafari.desktop",
+  "productName": "TimeSafari",
   "directories": {
-    "buildResources": "resources"
+    "buildResources": "resources",
+    "output": "dist"
   },
   "files": [
     "assets/**/*",
@@ -12,17 +14,51 @@
   "publish": {
     "provider": "github"
   },
+  "linux": {
+    "target": [
+      {
+        "target": "AppImage",
+        "arch": ["x64"]
+      },
+      {
+        "target": "deb",
+        "arch": ["x64"]
+      },
+      {
+        "target": "rpm",
+        "arch": ["x64"]
+      }
+    ],
+    "icon": "assets/appIcon.png",
+    "category": "Office",
+    "description": "Time Safari - Community building through gifts, gratitude, and collaborative projects",
+    "maintainer": "Matthew Raymer <matthew@timesafari.app>",
+    "vendor": "TimeSafari"
+  },
   "nsis": {
     "allowElevation": true,
     "oneClick": false,
-    "allowToChangeInstallationDirectory": true
+    "allowToChangeInstallationDirectory": true,
+    "createDesktopShortcut": true,
+    "createStartMenuShortcut": true
   },
   "win": {
-    "target": "nsis",
+    "target": [
+      {
+        "target": "nsis",
+        "arch": ["x64"]
+      }
+    ],
     "icon": "assets/appIcon.ico"
   },
   "mac": {
-    "category": "your.app.category.type",
-    "target": "dmg"
+    "category": "public.app-category.productivity",
+    "target": [
+      {
+        "target": "dmg",
+        "arch": ["x64", "arm64"]
+      }
+    ],
+    "icon": "assets/appIcon.png"
   }
 }