chore: add concurrency group to deploy workflow

[vreshch]

Prevent overlapping deployments when multiple merges happen in quick succession. New merge cancels in-progress deploy.

[github-actions]

🔍 PR Validation ✅

Commit: 085a4398cc686f57628701bdbeb799a24beb18a1 | Branch: chore/add-deploy-concurrency

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Step	Status
📦 Dependencies	✅
🔍 Linting	✅
🏗️ Build	✅
🐳 Docker	✅
🎭 E2E Tests	✅

🔄 Visual Changes (5 of 20 screenshots)

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🔄 Changed	5
✅ Unchanged	15

📸 downloads dark desktop — 100% changed (1,126,400 px)

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📸 downloads dark mobile — 100% changed (556,875 px)

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📸 downloads light desktop — 100% changed (1,126,400 px)

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📸 downloads light mobile — 100% changed (556,875 px)

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📸 home dark mobile — 1.222% changed (16,470 px)

🔙 Before	🔜 After	🔬 Smart Diff

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Page	🌙 Dark Desktop	🌙 Dark Mobile	☀️ Light Desktop	☀️ Light Mobile
home	✅	🔄	✅	✅
screenshots	✅	✅	✅	✅
documentation	✅	✅	✅	✅
downloads	🔄	🔄	🔄	🔄
support	✅	✅	✅	✅

🚀 Ready to merge!

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⏰ 2026-03-14T22:29:58.616Z