✨ feat(ui): display version and git hash in header

Add version info display below "ERP Auto" logo showing format:
${version}(${git-hash})

- Inject __APP_VERSION__ and __GIT_HASH__ via vite define
- Add TypeScript declarations for global constants
- Simplify portable artifact name (remove version)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

electron.vite.config.ts

@@ -2,11 +2,29 @@ import { resolve } from 'path'
 import { defineConfig } from 'electron-vite'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
+import { execSync } from 'child_process'
+
+// Get git hash (first 7 characters)
+const getGitHash = (): string => {
+  try {
+    return execSync('git rev-parse --short=7 HEAD', { encoding: 'utf-8' }).trim()
+  } catch {
+    return 'unknown'
+  }
+}
+
+// Get version from package.json
+const version = require('./package.json').version
+const gitHash = getGitHash()
 
 export default defineConfig({
   main: {},
   preload: {},
   renderer: {
+    define: {
+      __APP_VERSION__: JSON.stringify(version),
+      __GIT_HASH__: JSON.stringify(gitHash)
+    },
     resolve: {
       alias: {
         '@renderer': resolve('src/renderer/src')