feat: add themes scatter chart, HowToRead section, and fix 9 UI annotation tasks
- Add ThemesTab with recharts ScatterChart (domain-colored, labeled dots)
- Add HowToRead standalone section (score spectrum, valence markers, domains, intensity, tips)
- Add demo-report-data.ts with anonymized synthesis data
- Fix report fan: use overflow-x-clip instead of overflow-hidden to preserve shadows
- Fix HowItWorks: move connector lines behind cards, fix SVG gauge arc alignment
- Fix ScoreTab: increase gauge spacing, add score band labels (0-100)
- Fix testimonials: use overflow-clip to allow page scroll through section
- Fix banner: increase logo size
- Add EN/ES i18n keys for themes tab and HowToRead section
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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