[Adnan9-63]

Description

This PR resolves two core bugs in the stats and streak tracking engine:

1. Fix double-counting of session coding time in \getSnapshot()\ (Fixes Fix double-counting of session coding time in getSnapshot() #22):

   • Previously, \StatsEngine.getSnapshot()\ added \ his.totalCodingMins + this.getSessionMinutes(). Because
     ecordCodingTime(1)\ already accumulates minutes in real time every 60 seconds, adding session minutes resulted in session time being counted twice.
   • Now returns \ otalCodingMins\ directly without inflating by wall-clock session time.

2. Recalculate or clear inactive streak on startup (Fixes Recalculate or clear inactive streak on startup #24):

   • Previously, streaks were only evaluated when a file was saved or lines were typed. If a user had a 10-day streak and didn't code for 2 weeks, browsing files would still display \10-day streak.
   • Adds _checkStreakExpiry()\ on startup and snapshot computation. If 2 or more days have elapsed since \lastActiveDay, the active streak is cleanly reset to 0 while preserving \longestStreak.

3. Added comprehensive unit test suite:

   • Added \ ests/stats.test.js\ with full test coverage for coding time accumulation, streak expiration after inactivity, and consecutive day continuation.
   • Added
     pm test\ to \package.json\ and CI workflow.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New unit tests (adds regression testing)

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