fix: specify h3 and span selectors for groups search extraction (#593)

[sigvardt]

Summary

Resolves #593

The scraper for group search was extracting the entire text block of the search result card for the name and member_count properties. This was because it fell back to .innerText on the card or textContent on the app-aware-link which often wraps the entire group search result card in LinkedIn's modern UI.

This PR fixes this behavior by targeting specific h3 and span selectors that explicitly contain the name and member count before falling back to less precise methods.

Changes

• Modified legacyCards group search extractor to first attempt specific h3 and span selectors for name.
• Modified legacyCards group search extractor to attempt specific span elements for member count before falling back.
• Updated extractAiCards and the general list fallback logic to also prioritize explicit .querySelectorAll("span") and h3 tags.

Validation

• Ran the existing groups.e2e.test.ts to ensure searchGroups output remains intact.
• Ran tsc -b packages/core successfully to ensure type safety.
• Lint passed cleanly.

Closes #593