fix(privacy): implement balanced tier protections

[benniao85]

Summary

• add an escaped, highlighted PII preview with explicit confirmation in Balanced mode
• persist per-type PII controls and apply them to Balanced detection and Strict redaction
• require allow-once approval for sensitive-file reads across sandbox file and child-process APIs, including links, copies, scripts, and inherited child environments

The clear-all-history behavior reported in the issue is already fixed on main by commit 8135a9a.

Validation

• desktop: 637 tests passed
• desktop/renderer: 148 tests passed
• desktop and renderer production builds passed
• ESLint completed with zero errors
• AppContainer hook syntax checks passed

Closes #60

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