- Rename nav tab and sub-nav from 'Procurement Intel' to 'Procurement Intelligence'
- Add data-tip tooltips to all 8 ABC table column headers
- Add title attributes to signal badges, ABC class badges, supply risk, stock/price/lead trend spans, signal strength bar
- Add hover descriptions to Market Intelligence type icons, buy signal badges, technology tags, impact horizon, source
- Add hover descriptions to Lifecycle Events type icons, buy signal badges, impact level, effective date
- Tooltips explain business meaning of every data point (e.g. ABC classification formula, demand score composition, supply risk levels)
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