[Claude Desktop] Missing File menu in version 0.12.125 on Windows 10

Bug Report: Claude Desktop (not CLI)

Environment:

• Product: Claude Desktop
• Version: 0.12.125
• OS: Windows 10
• Platform: Desktop application

Issue:
The File menu is completely missing from the Claude Desktop interface in version 0.12.125.

Expected behavior:
File menu should be visible in the application interface (typically in top menu bar or accessible via keyboard shortcuts).

Actual behavior:

• No File menu visible anywhere in the interface
• Only bottom action buttons are present: Code, Learn, Write, Life stuff
• Standard Windows application menus are absent

Steps to reproduce:

1. Install Claude Desktop 0.12.125 on Windows 10
2. Launch the application
3. Observe the interface - File menu is missing
4. Try Alt+F or F10 - no menu appears

Visual evidence:
Screenshot provided showing the missing File menu in the Claude Desktop interface.

Additional context:

• Issue persists after complete reinstallation
• May be related to recent UI changes in version 0.12.125
• Users expect standard application menus for file operations

Related issues:
Similar to #6793 (Claude Desktop UI bug with missing top bar)

Impact:
Users cannot access standard file operations through expected menu interface, affecting user experience and workflow.

<img width="1473" height="908" alt="Image" src="https://github.com/user-attachments/assets/39ad1491-202d-48fb-ab23-eda94e8d0544" />