feat(ui): replace mock nudges with categorized JSON data

[emypeeler]

Summary

This PR replaces the hardcoded mock nudges with a comprehensive categorized dataset from JSON, improving the variety and organization of nudges displayed to users.

Changes

• Added assets/Nudge_Language_Categorized_Updated.json - New dataset containing 40+ categorized nudges with themes (Regret, Financial, Environmental, Mindfulness) and types (Call to action, Statistic, Question, Statement)
• Updated components/Nudge.tsx - Replaced MOCK_NUDGES array with import from JSON file, added width styling for better text display
• Updated style.css - Improved text wrapping with word-wrap and overflow-wrap properties, increased line-height from 1.4 to 1.5
• Updated guide-style.md - Formatting improvements (Prettier)

Testing Notes

• Linting passed (npm run lint)
• Formatting applied (npm run format)
• Component functionality verified - nudges are randomly selected from the new dataset

Breaking Changes

None - This is a drop-in replacement that maintains the same component interface.

Labels

• type:feature
• area:ui

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