fix: restrict media protocol paths

[AboMeezO]

Summary

• Remove permissive drive-root access from the custom media protocol.
• Allow external media only from configured directories, saved project icon directories, or image paths selected through the app in the current session.

Problem

When SELFHOST_MEDIA_ALLOWED_DIRS was unset, media:// external path requests could read any readable file under the resolved drive root.

Solution

Replace the drive-root fallback with explicit allow-list sources while preserving bundled media://app/... assets and project icon previews.

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: 0a2d6c92-1d15-4da0-b2f7-30fb9d232c06

📥 Commits

Reviewing files that changed from the base of the PR and between 90f771f and e9d366b.

📒 Files selected for processing (3)

• electron/ipc/handlers.js
• electron/main.js
• electron/services/mediaAllowlist.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/restrict-media-protocol-main

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