fix(windows): incorrect UTF8/GBK string encoding handling

[Yundi339]

Description

Fix Windows menu and tray icon text appears Chinese garbled problem.

Older versions use ANSI APIs (MENUITEMINFO, Shell_Icon) resulting in a higher level of API usage when the system code page is GBK/CP936
If you enter a UTF-8 encoded string, garbled text appears.

This change switches to Unicode API:

• Use MENUITEMINFOW, Shell_NotifyIconW
• Convert UTF-8 to UTF-16 via MultiByteToWideChar before invocation
• Solved the abnormal display problem of multi-language environment such as Chinese and Japanese.

Screenshot

After repair (normal display chinese):

Issues Fixed or Closed

• None

Roadmap Issues

• None

Type of Change

• fix: Bug fix (non-breaking change which fixes an issue)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• Moderate: AI helped with code generation or debugging specific parts

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud