Replace placeholder use cases with real client case studies

[puleri]

Motivation

• Replace generic placeholder scenarios with concrete, customer-facing case studies that reflect recent engagements and improve copy clarity for the use-cases hub.

Description

• Updated src/app/use-cases/page.jsx to replace the placeholder useCases entries with three real case studies: a WordPress→Next.js migration, a Salesforce+Snowflake dashboard build for a private cybersecurity SaaS, and a rapid codebase audit for a startup outage.
• Updated the featuredCases array to mirror the new, real-world narratives and outcomes.
• Refined the filterGroups options for challenge and businessType to align with the new case-study categories and make filters more meaningful for the content.

Testing

• Ran npm run build which completed successfully and generated the static and SSG pages for the site.
• Ran npm run lint which failed in this environment due to next lint reporting an invalid project directory error referencing /workspace/alpath/lint.

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Codex Task