Remove text overlap detection to prevent content loss

The overlap detection logic in mergeTexts() was incorrectly removing
content when the end of one segment matched the beginning of another.
This caused entire sentences to be dropped. Direct concatenation is
now used instead, which may occasionally produce duplicate text but
will never lose content.

Also added GitHub account switching note to CLAUDE.md.

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

Author: ZhaoChaoqun

CLAUDE.md

@@ -1,5 +1,17 @@
 # Nano Typeless 项目开发备忘
 
+## GitHub 账号
+
+本机有两个 GitHub 账号：
+- `chaoqunzhao_microsoft` - 公司账号
+- `ZhaoChaoqun` - 个人账号
+
+**typeless 是个人项目**，使用 `gh` 命令时如果遇到权限错误，请先切换到个人账号：
+
+```bash
+gh auth switch -u ZhaoChaoqun
+```
+
 ## Release 构建流程
 
 构建 Release 版本后，需要重新签名才能在本地运行：

Sources/RecordingManager.swift

@@ -172,27 +172,8 @@ class RecordingManager {
         }
     }
 
-    /// 智能拼接文字，去除重叠部分
+    /// 拼接文字
     private func mergeTexts(_ existing: String, _ new: String) -> String {
-        guard !existing.isEmpty, !new.isEmpty else {
-            return existing + new
-        }
-
-        // 查找最长重叠（最多检查 10 个字符）
-        let maxOverlap = min(existing.count, new.count, 10)
-
-        for overlapLen in stride(from: maxOverlap, through: 1, by: -1) {
-            let suffix = String(existing.suffix(overlapLen))
-            let prefix = String(new.prefix(overlapLen))
-
-            if suffix == prefix {
-                // 找到重叠，去除 new 的重叠前缀
-                print(">>> 检测到重叠: \"\(suffix)\"，已去除")
-                return existing + String(new.dropFirst(overlapLen))
-            }
-        }
-
-        // 无重叠，信任模型输出的标点，直接拼接
         return existing + new
     }