🛡️ Sentinel: [HIGH] Fix Command Option Injection

[dttdrv]

🚨 Severity: HIGH
💡 Vulnerability: The mainFile parameter in backend/src/services/compileQueue.ts was passed to the latexmk binary via the Rust worker without validation. If mainFile started with a hyphen (-), it could be treated as a flag (e.g., -shell-escape), leading to Command Option Injection and potentially Remote Code Execution (RCE).
🎯 Impact: Attackers could inject arbitrary compiler flags into the latex worker execution, allowing arbitrary code execution or file access outside the scope of the project.
🔧 Fix: Added explicit validation to reject mainFile inputs starting with a hyphen in compileQueue.ts.
✅ Verification: Tested against existing unit tests using npx vitest run. Evaluated via code review.

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PR created automatically by Jules for task 15129120703110867285 started by @dttdrv

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