Add GA4 tracking for chat_send and knowledge_generate events

[kromiii]

Motivation

• Record user interactions (chat sends) and knowledge-generation actions as GA4 events so product/usage analytics can track these key behaviors.

Description

• Add a reusable trackAnalyticsEvent helper in app/chat/ChatClient.tsx that safely pushes events to dataLayer for GTM/GA4 consumption.
• Emit a chat_send event from handleSubmit with web_search_enabled and message_length parameters when a user sends a message.
• Emit a knowledge_generate event from handleTurnIntoKnowledge on successful digest generation with a message_count parameter.
• Implementation assumes GTM is loaded via NEXT_PUBLIC_GTM_ID in app/layout.tsx so dataLayer will be processed by GTM/GA4.

Testing

• Ran npm run lint and the linter completed with no errors.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
today-i-learned	Ready	Preview, Comment	Apr 19, 2026 1:16pm