🛡️ Sentinel: Secure Electron IPC handlers against injection

[beingniloy]

🛡️ Sentinel Security Improvement: Secure IPC Handlers

• 🚨 Severity: MEDIUM
• 💡 Vulnerability: Shell Command/Process Injection & Git Argument Injection
• 🎯 Impact: A compromised renderer process could execute arbitrary local commands on the system or abuse Git command parameters to execute code.
• 🔧 Fix: Added strict shell validation against a safe whitelist of terminal shells, and prohibited dangerous options in Git subcommands on the Electron main process side.
• ✅ Verification: Verified using read-only checks, and ran lint and build suites successfully.

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PR created automatically by Jules for task 2920371109427433151 started by @beingniloy

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