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Fix avatar loading freeze: add timeouts to prevent indefinite hang

[fix] Restore endSession function destroyed during hot-keywords merge - was causing orphan code crash and avatar loading freeze

[feature] Hot keywords engine, suggestion chips + news cards per topic

[style] Suggestions panel, hot keywords badge, news card styles (dark)

[fix] Guard all remaining voiceTyper.stop() calls with try-catch

[fix] Auto-mute mic when AI speaks, guard voiceTyper, mute btn → speaker

[fix] Restart voice typing after AI response finishes + on reconnected in text mode

[fix] sendTextMessage: always restart S2S session if not sendable; avoid dead zone

[fix] Keep voiceTyper alive in chat mode on user-speaking; auto-restart S2S session instead of /api/chat fallback

[fix] Remove auto-start mic — mic only activates on user click

[style] Mic button active state

[feature] Voice mode: Vietnamese STT subtitles for user speech (vi-VN) + text chat voice typing

[feature] Integrate Vietnamese STT voice typer into text chat

[feature] Add Vietnamese STT voice typer (voiceTyper.js)

Restore to fb0c0d2df217a3c14b1856875443edf0eb589a16: remove src/voiceTyper.js

Restore to fb0c0d2df217a3c14b1856875443edf0eb589a16: update src/style.css

Restore to fb0c0d2df217a3c14b1856875443edf0eb589a16: update src/app.js

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fix CRITICAL: Add 5s AbortSignal timeout to getHotNewsGreeting() to prevent infinite loading

fix CRITICAL: GREETING_INSTRUCTIONS had raw newlines inside double-quoted string causing Uncaught SyntaxError on every page load

feat: restore greeting intro for both voice+chat modes + fix chat mute toggle with port.postMessage

feat: restore greeting intro for both voice+chat modes + fix chat mute toggle with port.postMessage

fix: avatar timeout 8s→30s + remove undefined 'return welcome' (ReferenceError)

Restore: full revert to commit fcf5333883a309cb6bc9161453d8c49f9f956ea9

Cleanup before restore to commit fcf5333

Restore: revert to commit fcf5333883a309cb6bc9161453d8c49f9f956ea9