blog: add GSoC'26 Weeks 10

[Ashutoshx7]

Summary

• add the Week 10 report covering multi-area generation, preview improvements, and visual references
• add the Week 11 report covering community contributions for branding and activity naming
• add the Week 12 final report covering pipeline reliability, reflection-led refinement, and the v1.4.0 release

Verification

• scoped Markdown lint passes for all three posts
• npm run build passes

[github-actions]

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Check	Status
Build	✅ Passed
TypeScript linting	✅ Passed
Markdown linting	✅ Passed
Code formatting	✅ Passed

This pull request is ready for maintainer review. 🚀

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[Ashutoshx7]

Superseded by three separate weekly submissions: Week 10 in #1036, Week 11 in #1037, and Week 12 in #1038.