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.

English ASCII characters (0x00–0x7F) are identical in all common encodings:
English : Open Sunshine
UTF-8: 4F 70 65 6E 20 53 75 6E 73 68 69 6E 65
GBK: 4F 70 65 6E 20 53 75 6E 73 68 69 6E 65
ASCII: 4F 70 65 6E 20 53 75 6E 73 68 69 6E 65

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

[ReenigneArcher]

Why did you close #73 ?

[Yundi339]

Why did you close #73 ?

Yes, I closed it. Sorry~~
My intention was to reopen the PR once the git force push was successful. However, I've since found out that GitHub does not allow a closed Pull Request to be reopened after its history has been forcefully overwritten.

I'm still relatively unfamiliar with the Git force push process. I wanted to performing a commit squash and I closed the PR to temporarily stop the Action runs.

Thank you for your understanding.

[ReenigneArcher]

I'm still relatively unfamiliar with the Git force push process. I wanted to performing a commit squash and I closed the PR to temporarily stop the Action runs.

Oh, no problem! We will also do a squash and merge when the PR is merged so it will end up as a single commit in the base branch.

I'm also manually approving the actions, so it's not a bother if you have new changes/commits.