fix(forage): align item detail header layout

Summary

• Reuses the standard forage page header structure on item detail pages so GitHub issue details align with the rest of the forage UI.
• Removes the duplicate detail-specific icon/header CSS that made the title area read like a second card header.
• Keeps long forage item titles from overflowing by adding wrapping and min-width handling to the shared title group.

Testing

• mix format lib/hive_web/components/forage_components.ex assets/css/routes/forage.css
• mix test test/hive_web/live/forage_live/github_issues_test.exs test/hive_web/live/forage_live/feature_requests_test.exs
• mix compile --warnings-as-errors
• curl -sS -o /tmp/hive-forage-issue.html -w '%{http_code}\n' http://localhost:4743/forage/items/github-issue/9a9aae05-54b1-4ede-a1e7-e65d3023752f

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