fix: validate filesystem IPC paths

[AboMeezO]

Summary

• Validate renderer-provided filesystem and Git IPC paths against registered project roots.
• Keep Settings access to the app user-data directory working for openPath.

Problem

Several IPC handlers accepted renderer-provided paths directly, allowing a compromised renderer to read, write, open, or run Git operations outside known project directories.

Solution

Add a centralized project-root path validator in the main process and apply it to file read/write, folder watching, recursive directory reads, Git handlers, clone targets, and shell path opening.

Verification

• npm run typecheck
• npm run lint
• npm run build:web

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 83552479-9e7e-4aa8-bf4f-a5096bc1c858

📥 Commits

Reviewing files that changed from the base of the PR and between 90f771f and b69d574.

📒 Files selected for processing (1)

• electron/ipc/handlers.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/filesystem-ipc-boundaries

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