Fix navigation and implement 3D Dark UI theme

[arslanvuzmal]

This PR addresses both functional navigation issues and the user's request for a professional, "3D" dark theme UI.

Functional Fixes:

1. Broken Links: Fixed the logo and setup wizard completion buttons which were either non-functional or using standard anchor tags that caused full page reloads.
2. API Client: Updated apps/web/src/lib/api.ts to correctly unwrap data payloads in its generic return types, preventing type errors across the frontend.

UI Improvements (3D Dark Theme):

1. Theming: Introduced a sophisticated grey and black color palette with high-contrast accents in globals.css and tailwind.config.ts.
2. 3D Aesthetic: Added custom shadow and gradient tokens to create depth, bevel effects, and interactive "floating" card states.
3. Dashboard: Overhauled with interactive BarChart and PieChart components for lead analytics, and modernized metric cards with trend indicators.
4. Lead Details: Redesigned the analysis view into a structured grid with a dedicated intelligence sidebar, utilizing radar charts for score visualization.
5. Component Refinement: Updated shared components (ScoreBadge, LeadCard, CriteriaEditor) to maintain aesthetic consistency across the platform.

Quality Assurance:

• Backend: Successfully ran all 86 unit tests via pytest.
• Frontend: Passed npm run type-check and npm run lint.
• Visual: Verified the new theme through Playwright screenshots.

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PR created automatically by Jules for task 6253863470002860216 started by @avuzmal

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