🛡️ Sentinel: Fix command injection in isInstalled

[piyyy314]

🛡️ Sentinel: Fix command injection vulnerability in isInstalled (src/lib/analytics/sources.ts)

• Severity: HIGH
• Vulnerability: Command injection risk when calling isInstalled with user or untrusted input via exec.
• Impact: Arbitrary command execution through shell expansion if input contained shell metacharacters.
• Fix: Replaced exec with execFile and argument arrays. Fixed error handling in runCommand so promise rejects on command failure/absence.
• Verification: Added unit tests in test/jest/unit/analytics-sources.spec.ts testing presence/absence handling and parameter passing without invoking a shell.

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PR created automatically by Jules for task 14514425229258977876 started by @piyyy314

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[piyyy314]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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