v1.4.0

Added

• Statistics Dashboard - complete overhaul with 7 interactive tabs:
  • Overview: 4 metric cards (total games, playtime, never played, perfect games)
    • genre donut chart + top 5 most played bar chart
  • Genre: side-by-side donuts (by count vs by playtime) with insight text
    showing "You own most RPGs but play Shooters the most"
  • Platform: 3 donuts showing real per-platform playtime (Windows/Linux/
    Steam Deck/Mac), Deck compatibility status, and ProtonDB tier distribution
  • Achievements: metric cards (unlocked, rare, ultra-rare, perfect) +
    completion buckets donut + almost-done bar + Trophy Wall with cover art
  • Playtime: playtime buckets + HLTB analysis + shame pile (installed
    never-played games sorted by HLTB estimate)
  • Ratings: PEGI distribution + review score buckets + top 10 developers
  • Comparison: search and compare any 2 games side-by-side across all metrics
• Chart Engine - custom QPainter-based DonutChart and BarChart widgets
  with hover effects, responsive legends, and "Others" bucketing. No external
  charting dependencies.
• Platform Playtime Tracking - per-platform playtime (Windows, Linux, Mac,
  Steam Deck) persisted in database from Steam API. Shows where you actually
  play instead of just "supported platforms".
• Playtime Persistence - game playtime and last-played timestamps saved to
  SQLite database, surviving Steam API outages.

Changed

• DB Schema v11 - added playtime_minutes, last_played, playtime_windows,
  playtime_linux, playtime_mac, playtime_deck columns to games table.
• Statistics dialog rebuilt as tabbed package (ui/dialogs/statistics/)
  replacing the old 177-line monolithic dialog.

Fixed

• API keys not loading from keyring - circular import at module init time
  prevented TokenStore from loading keys. Now deferred to bootstrap phase.