feat(phase7.1): add HelpTooltip system with contextual help icons
- New HelpTooltip component: hover-triggered floating panel, themed via
CSS variables, supports top/right/bottom/left positioning, no deps
- New helpTexts.ts registry: 14 entries covering render settings,
admin actions, template fields, and wizard fields
- Admin.tsx: tooltips on Cycles/EEVEE samples, smooth angle, regenerate
thumbnails, process unprocessed
- RenderTemplateTable.tsx: tooltips on material replace, lighting only,
shadow catcher column headers
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Hartmut
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