Suppress Wails non-file drag rejection / 抑制 Wails 非文件拖拽误报

[SivanCola]

Summary

• Suppress the known Wails non-file drag rejection when WebView reports invalid argument immediately after a native file drag.
• Keep generic invalid argument errors visible outside that drag context.
• Add regression coverage and wire it into the desktop frontend test scripts.

Verification

• cd desktop && wails generate module
• pnpm --dir desktop/frontend test:typecheck
• pnpm --dir desktop/frontend test
• pnpm --dir desktop/frontend build

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