Release v0.5.1 (#229)

[ViktorSvertoka]

• (SP: 1) [Security] Enforce origin posture for shop APIs (admin/checkout same-origin; internal/webhooks non-browser) + docs

• (SP: 1) [DB] Align stripe_events.order_id FK CASCADE across schema and migrations

• feat(i18n): localize quiz anti-cheat, header and blog filters (feat(i18n): localize quiz anti-cheat, header and blog filters #175)

• feat(Blog): Adding last published post to the blog and category page, recommended posts, Changing styles to one unified format, Bug fixes

• Update leaderboard-style

• Update leaderboard-style

• teat(Blog): fix of hover on author, fix of the line

• (SP: 3) [Observability] Extend structured logging + correlation IDs across all shop routes; purge console.*; enforce explicit error codes

• (SP: 1) [Admin][Security] Add safe product delete (PRODUCT_IN_USE) + mobile cards UI; tighten env/docs, locale normalization, cache-control, and logging semantics

• fix: npm installing

• (SP: 1) [Admin] Align products list in use checks with DB column names (order_items/inventory_moves)

• fix:Update leaderboard: fixed background

• fix: remove email from CurrentUser type to prevent PII exposure

• refactor: align leaderboard UI with brand style (fixed bg, css vars, podium glow)

• (SP: 1) [Frontend] About Us Page. Fixed game, topics, mobile layout

• Fixed mobile tabs in FeaturesSection (icon-only on mobile)
• Fixed game bugs: collision detection, animation, scoring system
• Added multiple obstacle types with level progression
• Improved game sizing for mobile while preserving desktop
• Updated TopicsSection with local SVG icons and hover borders
• Made DynamicGridBackground static grid opt-in via showStaticGrid prop
• Limited SponsorsWall to display max 10 sponsors
• Optimized CommunitySection button layout for mobile

• refactor: update accent color hover effects to Footer

• Update Footer links to use --accent-primary on hover
• Update ThemeToggle icons to use --accent-primary on hover
• Both components adapt colors to light/dark theme

• refactor: improve accessibility

• Add focus-visible styles for keyboard navigation accessibility

• (SP: 1) [Shop] Fix Stripe checkout success redirect (remove duplicate locale /uk/uk) ((SP: 1) [Shop] Fix Stripe checkout success redirect (remove duplicate locale /uk/uk) #186)

• fix:leaderboard update leaderboard-style

• fix:leaderboard update leaderboard-style (fix:leaderboard update leaderboard-style #187)

• fix:leaderboard update leaderboard-style on mobile

• fix: resolve CodeRabbit issues and conflicts

• fix:leaderboard update leaderboard-style on mobile (fix:leaderboard update leaderboard-style on mobile #188)

• fix:leaderboard update leaderboard-style

• fix:leaderboard update leaderboard-style on mobile

• fix: resolve CodeRabbit issues and conflicts

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• (SP: 1) [Frontend] Changing hero headline on shop main page ((SP: 1) [Frontend] Changing hero headline on shop main page #190)

• (SP: 1) [Shop] Fix checkout redirect 404 by removing duplicate locale in in-app routes and Stripe return_url

• (SP: 1) [Shop] Fix locale cart page and orderid page

• (SP: 1) [Frontend] Changin hero headline on shop main page

• (SP: 1) [Frontend] Fix styles shop home page, buttons ((SP: 1) [Frontend] Fix styles shop home page, buttons #191)

• fix: move row border to first cell to resolve CodeRabbit issue

• fix: move row border to first cell to resolve CodeRabbit issue new

• Feature/leaderboard style update (Feature/leaderboard style update #192)

• (SP: 7) [UI] Quiz UI polish: tabs styling, category accents, color scheme ((SP: 2) [UI] Style quiz page tabs to match Q&A page design + refactor to shared component #181, (SP: 2) [UI] Standardize quiz colors with accent variables + UI polish #193, (SP: 3) [UI] QuizCard UX refactor with category accent colors + quiz flow styling #194) ((SP: 7) [UI] Quiz UI polish: tabs styling, category accents, color scheme (#181, #193, #194) #195)

• Sanity (Sanity #196)

• feat(Blog):fix for clickable link in post details, fix for author details

• feat(Blog):refactoring after removing author modal

• feat(Blog): fix unified date format

• (SP: 3) [AI] Add AI word helper with Groq integration ((SP: 3) [AI] Add AI word helper with Groq integration #200)

• (SP: 3) [AI] Add AI word helper with Groq integration

• Implement Groq API with Llama 3.1 70B model
• Add text selection detection on Q&A page
• Create floating "Explain" button
• Build draggable modal with 3-language support (uk/en/pl)
• Add localStorage caching for instant repeated lookups
• Implement guest CTA (login/signup)
• Add rate limiting (10 requests/min)
• Auth-gated feature (registered users only)

Components:

• SelectableText: Detects text selection
• FloatingExplainButton: Appears on selection
• AIWordHelper: Main modal with explanations

• (SP: 1) i18n: fix Polish locale and set EN as default

• Sanity (Sanity #202)

• feat(Blog):fix for clickable link in post details, fix for author details

• feat(Blog):refactoring after removing author modal

• feat(Blog): fix unified date format

• feat(Blog): Fix for click-outside-to-close search, recommended posts are limited to 3

• feat(Blog): selectedAuthorData fixed

• feat(Blog): Added description for /blog/[slug] metadata, Added Schema.org JSON‑LD for Article (BlogPosting) and BreadcrumbList , Added  tags where blog dates renders

• Sanity (Sanity #203)

• feat(Blog):fix for clickable link in post details, fix for author details

• feat(Blog):refactoring after removing author modal

• feat(Blog): fix unified date format

• feat(Blog): Fix for click-outside-to-close search, recommended posts are limited to 3

• feat(Blog): selectedAuthorData fixed

• feat(Blog): Added description for /blog/[slug] metadata, Added Schema.org JSON‑LD for Article (BlogPosting) and BreadcrumbList , Added  tags where blog dates renders

• feat(Blog): fix hover social links, fixed duplication not found search

• (SP: 3) [Frontend] Refactor Header UI and navigation states ((SP: 3) [Frontend] Refactor Header UI and navigation states #201)

• (SP: 3) [Frontend] Refactor Header UI and navigation states

• Add icon to the language switcher

• Add GitHub icon with stars indicator (frontend only)

• Update logo styles

• Improve touch interaction styles

• Verify correct placement and alignment of all header components

• Make mobile header modal full-screen

• Disable background scroll when mobile menu is open

• Highlight active navigation item

• Update navigation styles:

• Highlight Shop link when user is on Home pages

• Highlight Home link when user is on Shop pages

• Style changes only, no routing or logic changes

• fix CodeRabbit

• update HeaderButton styles

• fix: add accessibility for HeaderButton

• (SP: 3) [Testing] Vitest config + unit + integration tests for quiz module ((SP: 3) [Testing] Vitest config + unit + integration tests for quiz module #204)

• feat(quiz-ui): quiz UI polish - tabs, category accents, color scheme (issues (SP: 2) [UI] Style quiz page tabs to match Q&A page design + refactor to shared component #181, (SP: 2) [UI] Standardize quiz colors with accent variables + UI polish #193, (SP: 3) [UI] QuizCard UX refactor with category accent colors + quiz flow styling #194)

• Refactor QaTabButton to shared CategoryTabButton component
• Add category accent colors to QuizCard, buttons, progress indicators
• Standardize colors with CSS variables, traffic light timer
• Add DynamicGridBackground to quizzes list page
• Border-only answer feedback, semi-transparent progress styles

• docs: update .gitignore

• fix(quiz): align disqualification threshold with warning banner

Changed violationsCount > 3 to >= 3 in QuizResult points block to match the warning banner threshold at line 124.

• feat(quiz-testing): add quiz unit tests

• Configure Vitest for quiz module
• Add test factories and setup utilities
• Add quiz-crypto tests (13 tests)
• Add quiz-session tests (12 tests)

• test(quiz): add integration tests for verify-answer API and useAntiCheat hook ((SP: 3) [Testing] Add integration tests for quiz components and API #199)

• verify-answer.test.ts: 8 tests for API endpoint

  • Correct/wrong answer verification
  • Validation errors (missing fields, tampered data)
  • Security: rejects modified encrypted answers

• quiz-anticheat.test.ts: 10 tests for useAntiCheat hook

  • Detects copy, paste, context-menu, tab-switch events
  • Respects isActive flag
  • Reset and cleanup functionality

Total quiz tests: 52 (9 setup + 25 unit + 18 integration)

• test(quiz): expand test coverage to 90%+ with hooks, API routes, and UI flow

Add 28 new tests covering:

• useQuizSession hook (6 tests)
• useQuizGuards hook (8 tests)
• guest-quiz storage (5 tests)
• guest-result API route (5 tests)
• quiz-slug API route (3 tests)
• QuizContainer UI flow (1 test)

Coverage: 35% -> 90.94% (quiz scope)
Tests: 52 -> 80

• chore: remove coverage-quiz from git, add to .gitignore

• chore: add coverage-quiz to .gitignore, fix quiz guards test

• fix(leaderboard): improve table mobile

• fix(leaderboard): correct malformed shadow class syntax for avatar glow

• Feature/leaderboard style update (Feature/leaderboard style update #206)

• fix:leaderboard update leaderboard-style

• fix:leaderboard update leaderboard-style on mobile

• fix: resolve CodeRabbit issues and conflicts

• fix: move row border to first cell to resolve CodeRabbit issue

• fix: move row border to first cell to resolve CodeRabbit issue new

• fix(leaderboard): improve table mobile

• fix(leaderboard): correct malformed shadow class syntax for avatar glow

• test(q&a): add comprehensive qa tests and coverage setup ((SP: 2) [QA] Q&A Tests & Coverage #208)

• test(q&a): add comprehensive qa tests and coverage setup

• test(q&a): align mocks and reset in qa tests

• (SP: 1) [Frontend] Remove Contacts References ((SP: 1) [Frontend] Remove Contacts References #211)

• test(q&a): add comprehensive qa tests and coverage setup

• test(q&a): align mocks and reset in qa tests

• chore(nav): remove contacts page references

• Sanity (Sanity #209)

• feat(Blog):fix for clickable link in post details, fix for author details

• feat(Blog):refactoring after removing author modal

• feat(Blog): fix unified date format

• feat(Blog): Fix for click-outside-to-close search, recommended posts are limited to 3

• feat(Blog): selectedAuthorData fixed

• feat(Blog): Added description for /blog/[slug] metadata, Added Schema.org JSON‑LD for Article (BlogPosting) and BreadcrumbList , Added  tags where blog dates renders

• feat(Blog): fix hover social links, fixed duplication not found search

• feat(Blog): Added: breadcrumbs to the post details page and updated the BreadcrumbList, logo to the cocial links in User info, Fixed: main container alignment, category navigation in breadcrumbs

• feat(Blog): Added: breadcrumbs to the post details page and updated the BreadcrumbList, logo to the cocial links in User info, Fixed: main container alignment, category navigation in breadcrumbs

• feat(Blog): Added scroll on the main blog page on filtering by author, fied breadcrumbs category translaion, added category to the recommended cards, fixed search for localisations

• feat(Blog): Changed image size on the post details page

• chore(release): update changelog for v0.5.0

• chore(release): v0.5.0

• [Refactor] Code Quality Improvements: Accessibility, Mobile Support, … ([Refactor] Code Quality Improvements: Accessibility, Mobile Support, … #213)

• fix(leaderboard): adjust podium heights for better visibility on desktop

• Feature/leaderboard style update (Feature/leaderboard style update #214)

• fix(leaderboard): fix layout centering

• feat(Blog) (feat(Blog) #216)

• feat(Blog) (feat(Blog) #218)

• feat(Blog):fix for clickable link in post details, fix for author details

• feat(Blog):refactoring after removing author modal

• feat(Blog): fix unified date format

• feat(Blog): Fix for click-outside-to-close search, recommended posts are limited to 3

• feat(Blog): selectedAuthorData fixed

• feat(Blog): Added description for /blog/[slug] metadata, Added Schema.org JSON‑LD for Article (BlogPosting) and BreadcrumbList , Added  tags where blog dates renders

• feat(Blog): fix hover social links, fixed duplication not found search

• feat(Blog): Added: breadcrumbs to the post details page and updated the BreadcrumbList, logo to the cocial links in User info, Fixed: main container alignment, category navigation in breadcrumbs

• feat(Blog): Added: breadcrumbs to the post details page and updated the BreadcrumbList, logo to the cocial links in User info, Fixed: main container alignment, category navigation in breadcrumbs

• feat(Blog): Added scroll on the main blog page on filtering by author, fied breadcrumbs category translaion, added category to the recommended cards, fixed search for localisations

• feat(Blog): Changed image size on the post details page

• feat(Blog): added tests

• feat(Blog): fix for big post on the post page, added tests

• feat(Blog): resolving comments

• feat(Blog): fixed hover for social links icins - dark theme

• (SP: 1) feat(i18n): translate 404 error page ((SP: 1) feat(i18n): translate 404 error page #217)

• Add 404 translations (uk/en/pl)
• Implement [Global/Local/Combined] strategy
• Add helpful navigation links

• (SP: 2) [Frontend] Refactor Home HeroSection and Footer stylestor/home ((SP: 2) [Frontend] Refactor Home HeroSection and Footer stylestor/home #221)

• (SP:1) fix: 404 page layout ((SP:1) fix: 404 page layout #219)

• 404 translations (uk/en/pl)
• Implement Global strategy

• feat(Blog) (feat(Blog) #222)

• feat(Blog):fix for clickable link in post details, fix for author details

• feat(Blog):refactoring after removing author modal

• feat(Blog): fix unified date format

• feat(Blog): Fix for click-outside-to-close search, recommended posts are limited to 3

• feat(Blog): selectedAuthorData fixed

• feat(Blog): Added description for /blog/[slug] metadata, Added Schema.org JSON‑LD for Article (BlogPosting) and BreadcrumbList , Added  tags where blog dates renders

• feat(Blog): fix hover social links, fixed duplication not found search

• feat(Blog): Added: breadcrumbs to the post details page and updated the BreadcrumbList, logo to the cocial links in User info, Fixed: main container alignment, category navigation in breadcrumbs

• feat(Blog): Added: breadcrumbs to the post details page and updated the BreadcrumbList, logo to the cocial links in User info, Fixed: main container alignment, category navigation in breadcrumbs

• feat(Blog): Added scroll on the main blog page on filtering by author, fied breadcrumbs category translaion, added category to the recommended cards, fixed search for localisations

• feat(Blog): Changed image size on the post details page

• feat(Blog): added tests

• feat(Blog): fix for big post on the post page, added tests

• feat(Blog): resolving comments

• feat(Blog): fixed hover for social links icins - dark theme

• feat(Blog): bringing the style on the blog page to a single site style

• feat(blog): aligning syles

• feat(blog): resolving comment from CodeRabbit

• feat(blog):fix comment for deployment

• Update AI model from 'llama-3.3-70b-versatile' to 'llama3-70b-8192' (Update AI model from 'llama-3.3-70b-versatile' to 'llama3-70b-8192' #223)

• (SP 2) [Frontend] Update Features section content and improve mobile UX ((SP 2) [Frontend] Update Features section content and improve mobile UX #224)

• (SP 2) [Frontend] Update Features section content and improve mobile UX

• Features Section: Refined feature content and visuals.
• Mobile UX: Improved responsive layout and scaling for feature cards and interactive elements.
• Visual Enhancements: Added dynamic particle background effects to the Pricing section.

• fix(review): address accessibility, security, and performance feedback

• fix(review): resolve accessibility and hydration issues

• fix(perf): implement frame-rate independent animations

• fix(review): address accessibility, security, and performance feedback

• fix(review): enable SSR for features section and support HiDPI canvas

• fix(review): correct HiDPI logic for particle canvas measurements

• (SP:3) feat(i18n): add UA and PL translations for shop/admin pages

Add comprehensive i18n support for shop and admin sections in 3 languages (en, uk,
pl).

Translation coverage:

• Shop pages: main page, products, cart, checkout, orders
• Admin pages: dashboard, products management, orders management
• Navigation: header, mobile menu, category links
• Product components: cards, filters, sort, badges (NEW/SALE)
• Category names: Apparel, Lifestyle, Collectibles
• All UI buttons, labels, and actions

Key changes:

• Added ~250+ translation keys to messages/en.json, messages/uk.json, messages/pl.json
• Updated 20+ components to use useTranslations() and getTranslations()
• Implemented color translation in cart and product detail pages
• Translated hero message
• Added badge translations

• fix(i18n): correct translation keys and localization in shop pages

  • Replace confusing error.order with success.orderLabel in checkout success page heading
  • Localize boolean stockRestored display (yes/no instead of true/false) in order details
  • Fix active state detection for shop category links in mobile menu using search params
  • Add missing translation keys (orderLabel, yes, no) to all locales (en, uk, pl)

• fix(netlify): resolve AI API crash and 404 locale/theme issues

AI fixes:

• Extract getClientIp to separate file (avoid db import crash)
• Add missing zod dependency to package.json

404 page fixes:

• Use NEXT_LOCALE cookie for locale detection on Netlify
• Add theme detection script in root layout
• Update styling with hero background and gradient text

• Update frontend/app/not-found.tsx

• (SP:3) feat(i18n): translate about page and auth form validation messages

  • Add about page translations (EN, UK, PL)
  • Add auth.fields.validation translations for form errors

• fix(api): resolve Netlify 503 errors and harden AI explain endpoint

• Use dynamic import for groq-sdk (Netlify compatibility) - Bypass rate limiting for unknown IPs (serverless safety)
• Safe JSON parsing with request.text() + empty body check
• Fix ReferenceError: remove undefined errorMessage variable
• Remove sensitive debug info from client responses
• Add i18n keys: pricing.heading, sponsors.ctaAriaLabel

• feat(api): add GET health check endpoint for ai-explain

• chore(release): v0.5.1

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Description

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Related Issue

Issue: #<issue_number>

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Changes

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Database Changes (if applicable)

• Schema migration required
• Seed data updated
• Breaking changes to existing queries
• Transaction-safe migration
• Migration tested locally on Neon

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How Has This Been Tested?

• Tested locally
• Verified in development environment
• Checked responsive layout (if UI-related)
• Tested accessibility (keyboard / screen reader)

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Screenshots (if applicable)

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Checklist

Before submitting

• Code has been self-reviewed
• No TypeScript or console errors
• Code follows project conventions
• Scope is limited to this feature/fix
• No unrelated refactors included
• English used in code, commits, and docs
• New dependencies discussed with team
• Database migration tested locally (if applicable)
• GitHub Projects card moved to In Review

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Reviewers

• @ViktorSvertoka
• @AndrewMotko

Summary by CodeRabbit

• New Features

  • Added comprehensive multi-language support (English, Ukrainian, Polish) across shop, blog, admin, and authentication pages.
  • Introduced AI explain endpoint with rate limiting and health status checks.
  • Enhanced About page with dynamic content, interactive game, and metadata.
  • Added blog search, filtering, and category navigation with featured posts.
  • Implemented theme persistence with instant dark mode initialization.

• Improvements

  • Expanded animations and particle effects with reduced-motion accessibility support.
  • Enhanced form validation messaging and accessibility across authentication.
  • Improved API error handling and response consistency.

• Tests

  • Added comprehensive test coverage for blog components and routes.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

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📝 Walkthrough

Walkthrough

This is a comprehensive internationalization (i18n) and UI refactoring effort affecting 80+ files. Changes include: extensive translation integration across shop, blog, and about pages via next-intl; introduction of new UI components (GradientBadge, ParticleCanvas, SectionHeading, DynamicGridBackground); relocation of HeroSection; blog layout restructuring with new wrapper components; AI explain API route hardening with rate limiting and client IP extraction; animation CSS updates; and multilingual message JSON expansions for English, Ukrainian, and Polish.

Changes

Cohort / File(s)	Summary
Changelog & Release Metadata CHANGELOG.md	Added v0.5.1 release entry with Added, Changed, and Fixed sections.
About Page & Components frontend/app/[locale]/about/page.tsx, frontend/components/about/*	Added metadata generation for about page; localized CommunitySection, FeaturesSection, HeroSection, InteractiveGame, PricingSection, SponsorsWall, TopicsSection with translation hooks and updated component structure (added GradientBadge, SectionHeading, ParticleCanvas usage).
Blog Pages & Layout frontend/app/[locale]/blog/page.tsx, frontend/app/[locale]/blog/[slug]/PostDetails.tsx, frontend/app/[locale]/blog/category/[category]/page.tsx	Wrapped blog content with DynamicGridBackground; added searchParams support to blog listing; introduced BlogPageHeader component conditional rendering; changed layout from center to left-aligned; updated breadcrumb navigation.
Blog Components frontend/components/blog/BlogFilters.tsx, frontend/components/blog/BlogPageHeader.tsx, frontend/components/blog/FeaturedPostCtaButton.tsx	Added author URL synchronization in filters; introduced new BlogPageHeader and FeaturedPostCtaButton components; updated featured post layout with absolute positioning.
Shop Admin Pages & Components frontend/app/[locale]/shop/admin/orders/page.tsx, frontend/app/[locale]/shop/admin/orders/[id]/RefundButton.tsx, frontend/app/[locale]/shop/admin/products/page.tsx, frontend/app/[locale]/shop/admin/page.tsx	Comprehensively localized all admin UI strings via getTranslations; added translation lookups for titles, labels, table headers, status messages.
Shop Pages frontend/app/[locale]/shop/page.tsx, frontend/app/[locale]/shop/products/page.tsx, frontend/app/[locale]/shop/products/[slug]/page.tsx, frontend/app/[locale]/shop/cart/page.tsx, frontend/app/[locale]/shop/checkout/...	Localized shop UI across product pages, cart, and checkout flows; added color translation helper in cart; replaced static strings with t(...) lookups.
Shop Components frontend/components/shop/add-to-cart-button.tsx, frontend/components/shop/catalog-products-client.tsx, frontend/components/shop/category-tile.tsx, frontend/components/shop/product-filters.tsx, frontend/components/shop/product-sort.tsx, frontend/components/shop/header/nav-links.tsx, frontend/components/shop/admin/*	Added i18n support across shop components; converted several to async functions for server-side translation loading; removed hard-coded NAV_LINKS constant.
404 Page frontend/app/[locale]/not-found.tsx, frontend/app/not-found.tsx	Deleted locale-specific 404 page; added new root 404 page with locale detection via cookies and localized text for uk/en/pl.
Home Components frontend/components/home/HeroSection.tsx, frontend/components/home/HeroBackground.tsx, frontend/components/home/HeroCodeCards.tsx, frontend/components/home/CodeCard.tsx, frontend/components/home/InteractiveCTAButton.tsx	Introduced new home-specific HeroSection with decorative components (HeroBackground, HeroCodeCards); added CodeCard and InteractiveCTAButton for animated CTA cycling.
Shared Components frontend/components/shared/HeroSection.tsx, frontend/components/shared/Footer.tsx, frontend/components/shared/OnlineCounterPopup.tsx	Removed old shared HeroSection (moved to home folder); updated Footer styling and link classes; localized OnlineCounterPopup.
Header & Navigation frontend/components/header/AppMobileMenu.tsx, frontend/components/header/MainSwitcher.tsx	Added locale-driven navigation labels via translations; removed min-height constraint for QA/home paths.
Q&A Components frontend/components/q&a/AccordionList.tsx, frontend/components/q&a/FloatingExplainButton.tsx, frontend/components/q&a/HighlightCachedTerms.tsx, frontend/components/q&a/SelectableText.tsx	Updated AccordionList to use exported CACHE_KEY; improved FloatingExplainButton ref management for callbacks; added keyboard and focus accessibility to HighlightCachedTerms; refactored SelectableText from mouseUp to selectionchange-based event handling.
Leaderboard Components frontend/components/leaderboard/LeaderboardPodium.tsx, frontend/components/leaderboard/LeaderboardTable.tsx	Adjusted rank heights (1: 70%, 2: 40%, 3: 20%); removed max-w-4xl constraint on LeaderboardTable.
UI Components & Utilities frontend/components/ui/gradient-badge.tsx, frontend/components/ui/particle-canvas.tsx, frontend/components/ui/section-heading.tsx	Added new GradientBadge and SectionHeading components; introduced ParticleCanvas with 3D particle animation and shape morphing (brackets/heart).
API Routes frontend/app/api/ai/explain/route.ts	Enhanced with diagnostics logging, per-IP rate limiting with bypass for unknown IPs, dynamic Groq SDK import, model switch to llama3-70b-8192, structured error handling, and new GET health endpoint; exported runtime = 'nodejs'.
Global Styles & Animations frontend/app/globals.css	Replaced float-soft/pulse-soft animations with wave-based and clip-path animations; added extensive utility classes (animate-slide-up-gradient, animate-wave-slide-up, animate-text-fade-in, etc.); added prefers-reduced-motion rule.
Layout & Theme frontend/app/layout.tsx	Added inline script for theme initialization via localStorage and system preference detection.
Security & Utilities frontend/lib/security/client-ip.ts, frontend/lib/ai/explainCache.ts, frontend/lib/home/cta-variants.ts	Added getClientIp utilities with header-based IP extraction and trust strategy; enhanced explainCache with validation and default helpers; introduced createCTAVariants for CTA styling.
Shop Data frontend/lib/shop/data.ts	Removed hero property from HomepageContent interface and data payload.
Translation Messages frontend/messages/en.json, frontend/messages/uk.json, frontend/messages/pl.json	Added extensive new sections: mobileMenu, shop (with 10+ nested subsections), onlineCounter, auth.fields.validation; expanded about namespace with hero, topics, features, pricing, sponsors, community; +500+ lines per file.
Test Files frontend/components/tests/blog/*, frontend/components/tests/*.test.tsx, frontend/lib/tests/*	Added comprehensive test suites for BlogCard, BlogCategoryGrid, BlogCategoryLinks, BlogFilters, BlogGrid, BlogHeaderSearch, BlogNavLinks, and blog/blog-author/blog-search API routes.
Configuration & Package frontend/package.json, frontend/tsconfig.json, frontend/vitest.config.ts, frontend/vitest.setup.ts	Added test scripts (test:blog, test:blog:coverage); added zod and @testing-library/jest-dom dependencies; added vitest/globals and @testing-library/jest-dom to tsconfig types; added vitest.setup.ts with @testing-library/jest-dom/vitest import.
Utilities & Proxies frontend/proxy.ts, frontend/project-structure.txt	Added NEXT_LOCALE cookie with path '/' and SameSite 'lax'; updated project structure documentation with new component/module additions.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~75 minutes

Possibly related PRs

• (SP: 1) feat(i18n): translate 404 error page #217: Adds localized not-found page with translation entries; directly related to main PR's not-found.tsx implementation and notFound message keys.
• Update AI model from 'llama-3.3-70b-versatile' to 'llama3-70b-8192' #223: Modifies frontend/app/api/ai/explain/route.ts with model switch to llama3-70b-8192 and runtime exports; same file and runtime constant changes.
• (SP:3) feat(i18n): add UA and PL translations for shop/admin pages #225: Extensive shop/admin localization across identical files (RefundButton, admin pages, components); directly overlaps with main PR's shop admin i18n work.

Suggested labels

refactor, internationalization, ui-enhancement

Suggested reviewers

• AM1007

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🐰 A rabbit's whisper on these changes grand,
Translations flowing across the land,
From blog to shop, with DynamicGrids they dance,
New particles swirl, animations entrance! ✨
A refactor so vast, with languages three—
DevLovers blooms brighter for all to see! 🌱

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch main

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