Добавить мерцание фона hero-блока

[konard]

Root cause

PR #149 still made the automatic effect belong to the hero teaser pill: React scheduled data-shimmer, and CSS animated .hero-shimmer-badge::after. Issue #150 asks for the background to flicker instead; text can adjust for contrast, but the visible motion should be on the background.

Fix

• Removed the timer-driven teaser shimmer state from Home.tsx.
• Added a CSS-only hero-background-flicker layer over the existing hero image.
• Made the background cycle smoothly through a light-blue / very-light-blue range over 9 seconds.
• Kept the teaser hover behavior: hovering reveals the background and pauses the flicker while the text fades for contrast.
• Updated the focused hero tests so they reject the old data-shimmer teaser behavior.

Reproduction and verification

Before the implementation, the focused hero tests failed because there was no background flicker layer and the teaser still owned data-shimmer.

Verified with:

node --test tests/hero-shimmer.test.mjs tests/hero-background.test.mjs
npm test
npm run build

Playwright verification:

• Desktop render captured below at a visible flicker phase.
• Mobile viewport confirmed hero-background-flicker is active with a 9s animation and no horizontal overflow.

Screenshot

Fixes #150

[konard]

Working session summary

Implemented and pushed the fix to PR 151: #151

Changed the hero effect so the background owns the slow light-blue flicker, and removed the old timer-driven teaser data-shimmer animation. Updated the focused hero tests and added the PR screenshot at docs/screenshots/issue150-hero-background-flicker-after.png.

Verification passed:

• node --test tests/hero-shimmer.test.mjs tests/hero-background.test.mjs
• npm test
• npm run build
• Playwright desktop/mobile render check

PR 151 is marked ready for review. GitHub reports no checks configured for this branch, and the local worktree is clean.

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[konard]

🤖 Solution Draft Log

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💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $9.650461

📊 Context and tokens usage:

• 208.8K / 1.1M (20%) input tokens, 29.6K / 128K (23%) output tokens

Total: (208.8K + 6.2M cached) input tokens, 29.6K output tokens, $9.650461 cost

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.5
• Model: GPT-5.5 (gpt-5.5)

📎 Log file uploaded as Repository (39469KB)

• View complete solution draft log

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