feat: Add sequential token prediction and placeholder options

- Implement sequential unmasking using previous predictions
- Add configurable placeholder options for unpredicted masks
- Add completed sentence display after prediction
- Improve UI with prediction set grouping and mask information
- Add inference text display for each mask
- Add toggle for sequential/parallel prediction mode

assets/index-BuZR9Kir.css

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assets/index-CF8Yv3Jz.css

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index.html

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