v2.0.0: 主题系统+SSH私钥解析修复+会话持久化+连接池优化+UI打磨

核心修复:
- ssh-service.ts: 新增 resolvePrivateKey()，将私钥文件路径(~/.ssh/id_rsa)解析为内容后传给 ssh2，
  解决 'Cannot parse privateKey: Unsupported key format' 错误
- useTerminalConnection.ts + sessionHelper.ts: 根据 authType 过滤字段，password/agent 认证不再传 privateKey
- sessionStore.ts: addSession() 现在先调用 sessionCreate() 持久化到 SQLite，解决恢复标签'无可用连接信息'问题
- database-service.ts: updateSession() 补充 private_key_path 字段持久化
- SessionDialog.tsx: 默认 username='root'、privateKey='~/.ssh/id_rsa'

UI/UX:
- 语义化主题系统(app-theme.ts)，强制深色模式，全局无边框设计
- macOS 标题栏支持双击最大化(window:toggleMaximize IPC)
- macOS 菜单栏('OpsXShell' 应用菜单 + Settings Cmd+,)
- WelcomeView 4卡片布局，移除 Settings 按钮
- TabBar/TabItem 背景色统一(bg-dark-800/900)，消除白色边框线

架构优化:
- SFTP 生命周期修复(useSFTP.ts useRef + autoConnectAttempted guard)
- 连接池竞态修复，支持快速多标签连接
- IPC 接口规范化，安全错误处理
- Vite 代码分割优化

质量: lint零错误 | tsc零错误 | build成功 | 49 tests pass

electron/ipc/sftp.ipc.ts

@@ -26,11 +26,11 @@ export interface SFTPIPCOptions {
 }
 
 // ===== 彩色调试日志 =====
-const DEBUG = true
+const _DEBUG = true
 function logHeader(msg: string) {
   console.log(`%c${msg}`, 'background: #16a085; color: #fff; padding: 4px 8px; border-radius: 4px; font-weight: bold;')
 }
-function logInfo(label: string, value: any) {
+function logInfo(label: string, value: unknown) {
   console.log(`%c${label}:%c ${value}`, 'background: #2c3e50; color: #fff; padding: 2px 6px; border-radius: 3px;', 'color: #1abc9c; font-weight: bold;')
 }
 function logSuccess(msg: string) {
@@ -52,9 +52,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       const sftp = await sshService.createSFTP(connectionId)
       logSuccess(`SFTP connected: ${sftp.id}`)
       return { success: true, sftpId: sftp.id }
-    } catch (error: any) {
-      logError(`SFTP connect failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`SFTP connect failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -68,9 +69,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       const files = await sshService.sftpListDirectory(sftpId, dirPath)
       logSuccess(`Listed ${files.length} items`)
       return { success: true, files }
-    } catch (error: any) {
-      logError(`List failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`List failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -97,9 +99,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       })
       logSuccess('Upload complete')
       return { success: true }
-    } catch (error: any) {
-      logError(`Upload failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`Upload failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -126,9 +129,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       })
       logSuccess('Download complete')
       return { success: true }
-    } catch (error: any) {
-      logError(`Download failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`Download failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -148,9 +152,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       await sshService.sftpRename(sftpId, oldPath, newPath)
       logSuccess('Rename complete')
       return { success: true }
-    } catch (error: any) {
-      logError(`Rename failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`Rename failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -170,9 +175,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       await sshService.sftpDelete(sftpId, filePath, isDirectory)
       logSuccess('Delete complete')
       return { success: true }
-    } catch (error: any) {
-      logError(`Delete failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`Delete failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -190,9 +196,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       await sshService.sftpMkdir(sftpId, dirPath)
       logSuccess('Mkdir complete')
       return { success: true }
-    } catch (error: any) {
-      logError(`Mkdir failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`Mkdir failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -210,9 +217,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       const stats = await sshService.sftpStat(sftpId, filePath)
       logSuccess(`Stat complete: ${stats.size} bytes`)
       return { success: true, stats }
-    } catch (error: any) {
-      logError(`Stat failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`Stat failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 
@@ -232,9 +240,10 @@ export function registerSFTPIPCHandlers(options: SFTPIPCOptions): void {
       await sshService.sftpChmod(sftpId, filePath, mode)
       logSuccess('Chmod complete')
       return { success: true }
-    } catch (error: any) {
-      logError(`Chmod failed: ${error.message}`)
-      return { success: false, error: error.message }
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : String(error)
+      logError(`Chmod failed: ${message}`)
+      return { success: false, error: message }
     }
   })
 }