[Adnan9-63]

Description

Fixes #31.

• Adds new configuration setting \codecritter.weekendStreakProtection\ (default: \ rue).
• When enabled, coding on Friday or Saturday extends across Sunday and Monday without breaking streaks.
• Implements _isWeekendGrace()\ logic in \src/stats.js\ for both streak expiration check (_checkStreakExpiry) and streak advancement (_updateStreak).
• Adds comprehensive unit tests in \ ests/stats.test.js\ verifying weekend bridge continuation and streak reset behavior when disabled.

Type of Change

• New feature (non-breaking change which adds functionality)
• New unit tests (adds regression testing)

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