Add the 💤 Away From Keyboard trigger card

[Necromancervbh]

A new rare WHEN card that unlocks at level 3. It fires once when you've been away from the keyboard and mouse for N minutes, or, if you pick when I come back, once when you return after being away that long. {{idle.awayFor}} holds how long you were gone, e.g. 15m 0s.

Ideas:

• 💤 away 10 min → 🪄 Arcane Command to pause music or lock the screen
• 💤 back after 30 min → 🔔 "Welcome back! You were away {{idle.awayFor}}" plus 🌀 open your task list

How idle time is read (platform.readIdleSeconds), checked every 15 seconds:

• macOS: HIDIdleTime from ioreg
• Windows: GetLastInputInfo, called through PowerShell
• Linux: GNOME's org.gnome.Mutter.IdleMonitor, which works on X11 and Wayland, then falls back to xprintidle

If it can't read idle time, the combo shows "Can't read idle time here (on Linux, install xprintidle)" and doesn't crash.

Tests:

• Fires once per absence, both when you leave and when you return
• awayFor values are correct
• The error is shown when idle time can't be read

Also: art, README card table and placeholders, the forge's list of placeholders, CHANGELOG, and the landing page now says 31 cards.

npm test: 47 tests pass.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Wm8TE3zwYDLddBccTdRBqf

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Generated by Claude Code

[coderabbitai]

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