feat: redesign community page with feed, news, events & guidelines

[aaniya22]

Description

Redesigns the community page to match the Codédex Community layout referenced in the issue, while keeping recode hive's existing theme and color palette. Adds a tabbed feed section (Top Posts/Newest), a news sidebar card, an upcoming events card, and a community guidelines card — all built on top of the existing hero and "How You Can Contribute" sections, which are unchanged.

Fixes #339

Type of Change

• New feature (e.g., new page, component, or functionality)
• Bug fix (non-breaking change that fixes an issue)
• UI/UX improvement (design, layout, or styling updates)
• Performance optimization (e.g., code splitting, caching)
• Documentation update (README, contribution guidelines, etc.)
• Other (please specify):

Changes Made

• Added a Top Posts / Newest tabbed feed section with post cards
• Added a "recode hive News" sidebar card
• Added an "Upcoming Events" sidebar card
• Added a Community Guidelines card linking to CODE_OF_CONDUCT.md
• Added Twitter/LinkedIn follow links
• Verified responsive stacking at the 900px breakpoint (feed layout collapses to single column)
• Kept the existing "How You Can Contribute" and Thank You sections unchanged below the new feed
• Note: feed posts/news/events currently use static sample data — a live Twitter/LinkedIn feed would need backend API integration, flagged as a follow-up

Dependencies

• None — no new packages or config changes required

Checklist

• My code follows the style guidelines of this project.
• I have tested my changes across major browsers and devices
• My changes do not generate new console warnings or errors.
• I ran npm run build and attached screenshot(s) in this PR.
• This is already assigned Issue to me, not an unassigned issue.

[vercel]

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[github-actions]

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[github-actions]

✅ Synchronized metadata from Issue #339:

• Labels: enhancement, area:API, area:logging, area:dev-env, area:backend-sql, level 3
• Milestone: recode:launch 3.0