FIX: Comprehensive file manager UI/UX improvements and bug fixes

- Fix missing i18n for terminal.terminalWithPath translation key
- Update keyboard shortcuts: remove Ctrl+T conflicts, change refresh to Ctrl+Y, rename shortcut to F6
- Remove click-to-rename functionality to prevent accidental renaming
- Fix drag preview z-index and positioning issues during file operations
- Remove false download trigger when dragging files to original position
- Fix 'Must be handling a user gesture' error in drag-to-desktop functionality
- Remove useless minimize button from file editor and diff viewer windows
- Improve context menu z-index hierarchy for better layering
- Add comprehensive drag state management and visual feedback

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/backend/utils/database-save-trigger.ts

@@ -0,0 +1,162 @@
+import { databaseLogger } from "./logger.js";
+
+/**
+ * Database Save Trigger - 自动触发内存数据库保存到磁盘
+ * 确保数据修改后能持久化保存
+ */
+export class DatabaseSaveTrigger {
+  private static saveFunction: (() => Promise<void>) | null = null;
+  private static isInitialized = false;
+  private static pendingSave = false;
+  private static saveTimeout: NodeJS.Timeout | null = null;
+
+  /**
+   * 初始化保存触发器
+   */
+  static initialize(saveFunction: () => Promise<void>): void {
+    this.saveFunction = saveFunction;
+    this.isInitialized = true;
+
+    databaseLogger.info("Database save trigger initialized", {
+      operation: "db_save_trigger_init",
+    });
+  }
+
+  /**
+   * 触发数据库保存 - 防抖处理，避免频繁保存
+   */
+  static async triggerSave(reason: string = "data_modification"): Promise<void> {
+    if (!this.isInitialized || !this.saveFunction) {
+      databaseLogger.warn("Database save trigger not initialized", {
+        operation: "db_save_trigger_not_init",
+        reason,
+      });
+      return;
+    }
+
+    // 清除之前的定时器
+    if (this.saveTimeout) {
+      clearTimeout(this.saveTimeout);
+    }
+
+    // 防抖：延迟2秒执行，如果2秒内有新的保存请求，则重新计时
+    this.saveTimeout = setTimeout(async () => {
+      if (this.pendingSave) {
+        databaseLogger.debug("Database save already in progress, skipping", {
+          operation: "db_save_trigger_skip",
+          reason,
+        });
+        return;
+      }
+
+      this.pendingSave = true;
+
+      try {
+        databaseLogger.debug("Triggering database save", {
+          operation: "db_save_trigger_start",
+          reason,
+        });
+
+        await this.saveFunction!();
+
+        databaseLogger.debug("Database save completed", {
+          operation: "db_save_trigger_success",
+          reason,
+        });
+      } catch (error) {
+        databaseLogger.error("Database save failed", error, {
+          operation: "db_save_trigger_failed",
+          reason,
+          error: error instanceof Error ? error.message : "Unknown error",
+        });
+      } finally {
+        this.pendingSave = false;
+      }
+    }, 2000); // 2秒防抖
+  }
+
+  /**
+   * 立即保存 - 用于关键操作
+   */
+  static async forceSave(reason: string = "critical_operation"): Promise<void> {
+    if (!this.isInitialized || !this.saveFunction) {
+      databaseLogger.warn("Database save trigger not initialized for force save", {
+        operation: "db_save_trigger_force_not_init",
+        reason,
+      });
+      return;
+    }
+
+    // 清除防抖定时器
+    if (this.saveTimeout) {
+      clearTimeout(this.saveTimeout);
+      this.saveTimeout = null;
+    }
+
+    if (this.pendingSave) {
+      databaseLogger.debug("Database save already in progress, waiting", {
+        operation: "db_save_trigger_force_wait",
+        reason,
+      });
+      return;
+    }
+
+    this.pendingSave = true;
+
+    try {
+      databaseLogger.info("Force saving database", {
+        operation: "db_save_trigger_force_start",
+        reason,
+      });
+
+      await this.saveFunction();
+
+      databaseLogger.success("Database force save completed", {
+        operation: "db_save_trigger_force_success",
+        reason,
+      });
+    } catch (error) {
+      databaseLogger.error("Database force save failed", error, {
+        operation: "db_save_trigger_force_failed",
+        reason,
+        error: error instanceof Error ? error.message : "Unknown error",
+      });
+      throw error; // 重新抛出错误，因为这是强制保存
+    } finally {
+      this.pendingSave = false;
+    }
+  }
+
+  /**
+   * 获取保存状态
+   */
+  static getStatus(): {
+    initialized: boolean;
+    pendingSave: boolean;
+    hasPendingTimeout: boolean;
+  } {
+    return {
+      initialized: this.isInitialized,
+      pendingSave: this.pendingSave,
+      hasPendingTimeout: this.saveTimeout !== null,
+    };
+  }
+
+  /**
+   * 清理资源
+   */
+  static cleanup(): void {
+    if (this.saveTimeout) {
+      clearTimeout(this.saveTimeout);
+      this.saveTimeout = null;
+    }
+
+    this.pendingSave = false;
+    this.isInitialized = false;
+    this.saveFunction = null;
+
+    databaseLogger.info("Database save trigger cleaned up", {
+      operation: "db_save_trigger_cleanup",
+    });
+  }
+}