[FEAT] PDF Support

[Mored4u]

Is your feature request related to a problem? Please describe.
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PDF file extension support

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One click opebln PDF file ( Multi Page Support Like Arrow To Transport Pages )

Technical Note (Optional)
If you have ideas on SIMD optimization (AVX2/512), Direct2D transforms, or Titan engine integration.

Additional context
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Add close window 🪟 when not focus ( mouse go out of the App window )

[bananakid]

I support PDF handling feature, perhaps the best way to implement it is as a plugin of MuPDF DLL once QuickView plugins system is implemented (PDF is complicated). Basically, something like SumatraPDF or MuPDF's viewer does, but faster and lighter. However, I don't think this should be a priority until all the bugs are ironed out in QuickView, that are related to the currently suported file types stack.