[codex] trim project search queries

[Sean-Kenneth-Doherty]

Summary

• trim whitespace from project search terms before matching
• preserve the existing lowercase search behavior
• avoid false zero-result states when users type accidental leading or trailing spaces

Addresses #501

Validation

• git diff --check
• extracted inline script from src/components/ProjectList.astro and ran node --check -
• direct behavior check confirms react becomes react and still matches the React project
• GITHUB_TOKEN=$(gh auth token) pnpm build

[Sean-Kenneth-Doherty]

Validation notes for this search behavior fix:

• git diff --check passes
• extracted the inline script from src/components/ProjectList.astro and node --check - passes
• direct behavior check confirms react is normalized to react and still matches the React project
• GITHUB_TOKEN=$(gh auth token) pnpm build passes