Storyboard Fractional Index sorting

[StevenWeathers]

Description

This PR refactors Refactor storyboard story, goal, and column sortings to use fractional indexes, this is more performant (reduced DB writes from N to 1 per item move) and reduces the risk of collision/interleaving.

What type of PR is this? (check all applicable)

• [ ] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [x] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

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