Added output filename support for to_pdf

[wmahfoudh]

What this Pull Request (PR) does

Revamp CLI argument handling and output naming logic: Rewrote command-line argument handling to support intuitive input/output resolution, added automatic .tex file discovery, and improved output filename generation.

Changes

• Smart Argument Resolution

  // New logic
  switch argCount {
    case 0: // stdin → output.pdf
    case 1: // Detect if arg is .tex input/.pdf output/name stub
    case 2: // Input (with .tex fallback) + output name
  }

Related issues

Question #171

Screenshots

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