chore: 切换到 bun publish，修复 husky 路径问题，调整 diff 折叠距离，导出 VoiceContext

- publish-npm.yml: npm publish → bun publish，移除 setup-node，使用 BUN_CONFIG_TOKEN
- package.json: prepare 脚本 husky → bunx husky，版本 2.4.4 → 2.4.5
- Messages.tsx: DIFF_COLLAPSE_DISTANCE 从 0 改为 3，避免 diff 过度折叠
- voice.tsx: 导出 VoiceContext

package.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-code-best",
-  "version": "2.4.4",
+  "version": "2.4.5",
   "description": "Reverse-engineered Anthropic Claude Code CLI — interactive AI coding assistant in the terminal",
   "type": "module",
   "author": "claude-code-best <claude-code-best@proton.me>",
@@ -53,7 +53,7 @@
     "format": "biome format --write .",
     "check": "biome check .",
     "check:fix": "biome check --fix .",
-    "prepare": "husky",
+    "prepare": "bunx husky",
     "test": "bun test",
     "test:production": "bun run scripts/production-test.ts",
     "test:production:offline": "bun run scripts/production-test.ts --offline",