feat(ux): daemon indicator + F2 familiar switcher + status bar familiar

[BunsDev]

UX Polish — Coven Integration

Three focused UX improvements for deep Coven integration feel:

1. Daemon online/offline indicator in status bar

• Shows ✦ coven in violet (Rgb 139,92,246) when ~/.coven/coven.sock exists
• Shows ○ coven in DarkGray when daemon is offline
• Checked on startup, re-checked every ~30 seconds (300 frames)
• Cached in new AppState.daemon_online field

2. Familiar switcher shortcut (F2)

• Press F2 anywhere in main view to open a floating popup
• Navigate with j/k or arrow keys, Enter to switch, Esc/F2 to cancel
• Updates app.config.familiar in-session, shows toast notification
• Pre-selects currently active familiar

3. Status bar familiar emoji + name

• Shows current familiar's emoji + id (e.g. 👑 nova) in the footer left side
• Built-in emoji map: nova 👑, kitty 🐱, cody 💻, charm ✨, sage 🌿, astra 🌙, echo 👻

Build

• cargo check -p claurst-tui passes (1 pre-existing warning only)

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