fix: assemble dashboard page

[manueldezman]

Summary

Assembles the dashboard route into the intended overview layout and unblocks local previewing by fixing the missing chart dependency and local icon shim gaps. Also removes the nested dashboard shell that was causing duplicate navigation on large screens.

Closes #17

Changes

• assembled src/app/(dashboard)/dashboard/page.tsx with stat cards, RevenueChart, and RecentActivity
• added seeded recent activity data for the dashboard preview state
• removed the nested dashboard shell wrapper from src/app/(dashboard)/dashboard/layout.tsx to prevent duplicate navbars
• expanded the local lucide-react shim with the missing icons needed by the register flow and dashboard shell
• added recharts to project dependencies so RevenueChart can build locally

Verification

• npm run typecheck
• npm run format:check

Notes

• npm run typecheck was not fully clean before this change due to unrelated missing test/dev dependencies in the repo.

Screenshot

Desktop screen:

Mobile screen:

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[manueldezman]

@codebestia kindly review and merge

[codebestia]

LGTM!
Thank you for your contribution.