test: add pytest coverage for practice session recording and stats

[OmikronApex]

Twenty-second repo from the org test-coverage audit.

12 pytest tests over routes.py (FastAPI TestClient):

• /session: missing-filename error, sub-5-second sessions skipped (not persisted), valid sessions appear in stats
• /stats: empty-database shape, today/week time windows via explicit started_at timestamps, top-songs ordered by total practice time (with per-song session counts), unique-song counting, recent list ordered newest-first, 30-day daily grouping excludes older sessions
• /song/{filename}: empty history for an unknown song, total-time + session-count aggregation, chronological speed-progression ordering vs. newest-first session ordering, loops_used JSON decoding

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📥 Commits

Reviewing files that changed from the base of the PR and between e2fa462 and cfb66de.

📒 Files selected for processing (2)

• tests/conftest.py
• tests/test_sessions_and_stats.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-basic-tests

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