RESTORE commit 0f8aedf: app.js - fix tool_defs syntax, restore Gemma greeting

Restore src/app.js to target commit (Gemma greeting) (#11)

fix: restore full src/app.js with updated GREETING_INSTRUCTIONS (intro as V, trợ lý AI V.AI STUDIO + hướng dẫn sử dụng ngắn gọn)

update greeting: intro as V - trợ lý AI từ V.AI STUDIO + hướng dẫn sử dụng ngắn gọn

restore src/app.js to commit 0f8aedf

FEAT: greeting says V.AI STUDIO + hướng dẫn sử dụng space

restore src/app.js to commit 0f8aedf

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🐛 app.js: fix duplicate renderAll, hoist panel binding above product check

✨ app.js: skip avatar boot in product mode for instant product view

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Force rebuild 1785314382: clear Bun cache + use hidden attribute instead of class

Fix: use .hidden=true (attribute) instead of classList.add('hidden') - no CSS rule needed

RESTORE ALL FILES from original working commit + only add .hidden CSS

Fix 1785312544: restore originals + .hidden CSS in HTML + unique app.js comment to force new chunk

[fix] Pre-formatted products JSON (instant load, no parse), kill 30s poll loop, client fail-fast error state

[restore 876265b] + fetchWithRetry(3x) for reliable V.AISTUDIO product loading

[fix] Add fetchWithRetry(4 attempts, exponential backoff) — fixes infinite loading spinner on API fail

[fix] Load & format products from CDN — instant V.AISTUDIO list

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Fix vaistudioCurrentPage undefined - add pagination state vars

Frontend: server-side pagination (fetch 20/page, load more fetches next)

Frontend: use paginated API (first page only, instant load)

Restore src/app.js to commit 1a4cb2bc (v3 bundle restore)

Fix greeting 15s timeout + compact index for fast SP load. VAIX /products returns ~2.5MB compact fields. Detail loaded on-demand via /product/:sku.

Auto-greeting: fakemic no-mic voice session + Vietnamese TTS greeting. Products: direct JSON fetch from V.AISTUDIO + 5-min etag polling for real-time sync

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