Update route OG previews

[JoaquinBN]

Summary

• Adds dedicated OG preview images for /builders, /validators, and /community.
• Refreshes the root Portal OG image with abstract GenLayer branding, role hexagons, and steward support.
• Wires top-level role routes into route metadata/static OG generation.

Validation

• npm test -- --run src/tests/routeMeta.test.js
• npm run build

Build passes with existing Svelte warnings unrelated to this change.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: dd1a7af8-b0fb-4211-b182-0867f8d63e21

📥 Commits

Reviewing files that changed from the base of the PR and between 5f065f3 and 1f935fd.

⛔ Files ignored due to path filters (9)

• frontend/public/assets/icons/seedling-line-white.svg is excluded by !**/*.svg
• frontend/public/assets/og/backdrops/builders.png is excluded by !**/*.png
• frontend/public/assets/og/backdrops/community.png is excluded by !**/*.png
• frontend/public/assets/og/backdrops/portal-overview.png is excluded by !**/*.png
• frontend/public/assets/og/backdrops/validators-landing.png is excluded by !**/*.png
• frontend/public/assets/og/builders.png is excluded by !**/*.png
• frontend/public/assets/og/community.png is excluded by !**/*.png
• frontend/public/assets/og/portal.png is excluded by !**/*.png
• frontend/public/assets/og/validators.png is excluded by !**/*.png

📒 Files selected for processing (4)

• frontend/index.html
• frontend/scripts/render-og-images.py
• frontend/src/lib/routeMeta.js
• frontend/src/tests/routeMeta.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch JoaquinBN/genlayer-previews

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