feat(landing): add four more interactive delights

Adds four new interactive features to complete the experience:

1. **Crab Claw Cursor**
   - Custom 🦀 cursor replaces default pointer
   - Scales up on click for "pinch" effect
   - Reinforces crab theme throughout interaction

2. **Crab Mood Widget** (top-right corner)
   - Reactive ASCII crab face that responds to user actions
   - Scrolling: ( O_O) "wheee!"
   - Hovering: ( ^_^) "ooh!"
   - Clicking: ( >_<) "pinch!"
   - Copying: ( ★_★) "copied!"
   - Idle: ( -_-) "watching"
   - Falls asleep after 30s: ( -_-) zzz

3. **Command Hover Previews**
   - Mini terminal windows appear above command items
   - Shows animated preview of what the command does
   - Includes terminal dots and typed/output styling

4. **Enterprise Buzzword Bingo**
   - "🎯 Buzzword Bingo" button in bottom-right
   - Click to highlight all enterprise buzzwords on page
   - Shows count: "47 Synergy Detected!"
   - "Leverage This Insight" dismiss button
   - Click again to clear highlights

Together with previous features (metric counters, bubble pop,
section crabs), the landing page now has 7 interactive delights
that reward exploration and create shareable moments.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mldangelo