chore(deps): 全量升级依赖，适配 gpui-kit 0.7 与 ureq 3

- gpui-kit 0.6→0.7：main.rs 改用 gpui_kit::open_window 自动挂载 Root，
  移除内容视图手动挂载的 dialog/sheet/notification 层
- ureq 2→3：Agent::config_builder 配置超时（global/connect/recv_response），
  响应体改用 read_json / read_to_string / into_body().into_reader()
- hmac 0.13 需显式导入 KeyInit；digest 0.11 的 Output 不再实现 LowerHex，
  sha256 转 hex 改为逐字节格式化，并补已知向量测试
- windows 0.62：SetWindowPos 插入位置参数改为 Option<HWND>
- dirs 6→7、base64 0.22→0.23，其余锁内更新（tokio/sentry/rustls 等）
- TLS 栈不变（rustls + webpki-roots），无 openssl/native-tls 混入

已验证：cargo check 零警告；35 测试通过；运行应用截图核验主界面、
新建连接对话框打开与关闭均正常

gpui-app/Cargo.toml

@@ -11,7 +11,7 @@ name = "mqttx"
 path = "src/main.rs"
 
 [dependencies]
-gpui-kit = "0.6"
+gpui-kit = "0.7"
 
 anyhow = "1"
 serde = { version = "1", features = ["derive"] }
@@ -26,12 +26,12 @@ rumqttc-v4 = { package = "rumqttc-v4-next", version = "0.34", features = ["webso
 
 uuid = { version = "1", features = ["v4"] }
 chrono = { version = "0.4", features = ["clock"] }
-dirs = "6"
+dirs = "7"
 
 # 阿里云 MQTT 签名: HMAC-SHA1 -> Base64
-hmac = "0.12"
-sha1 = "0.10"
-base64 = "0.22"
+hmac = "0.13"
+sha1 = "0.11"
+base64 = "0.23"
 
 # 自定义 TLS（自定义 CA / 双向认证 / 跳过校验），版本与 rumqttc 内部使用的 rustls 一致
 rustls = { version = "0.23", default-features = false, features = ["std", "tls12", "aws_lc_rs"] }
@@ -42,8 +42,8 @@ rustls-native-certs = "0.8"
 rfd = "0.17"
 
 # OTA 自更新：Gitea Release 检查/下载（ureq 用 rustls，与 rumqttc 依赖同源）
-ureq = { version = "2", features = ["json"] }
-sha2 = "0.10"
+ureq = { version = "3", features = ["json"] }
+sha2 = "0.11"
 # Release 附件为 7z 压缩包，纯 Rust 解压（客户端免装 7-Zip）
 sevenz-rust = "0.6"
 
@@ -59,7 +59,7 @@ sentry = { version = "0.49", default-features = false, features = [
 # 窗口置顶（raw HWND + SetWindowPos）与进程资源采样
 raw-window-handle = "0.6"
 [target.'cfg(target_os = "windows")'.dependencies]
-windows = { version = "0.58", features = [
+windows = { version = "0.62", features = [
     "Win32_Foundation",
     "Win32_System_Threading",
     "Win32_System_ProcessStatus",