Instrument Pendo Track Events

[lci-novus-dev]

Summary

Instruments Pendo Track Events across the OKR Manager application to capture key user interactions. Events 1-17 were already instrumented; this PR adds the 4 missing events (18-21): objective deletion, AI chat message sent, AI chat API key configuration, and user registration failure.

Changes

• Added objective_deleted track event in ObjectiveCard.tsx handleDelete handler, capturing objective level, quarter, key result count, progress status, and child alignment info
• Added ai_chat_message_sent track event in ChatWidget.tsx after successful AI response, capturing message length, conversation count, quarter context, objectives count, response length, and first-message flag
• Added ai_chat_api_key_configured track event in ChatWidget.tsx saveKey function, capturing whether existing messages were present
• Added user_registration_failed track event in Register.tsx error branch, capturing the error reason

Notes

• All 21 specified track events are now instrumented across the codebase
• Events 1-17 were already present in the code prior to this PR
• All events are client-side using pendo.track() since all instrumented files are React components
• The okr_exported event in Dashboard.tsx uses a window.pendo guard pattern while other events call pendo.track() directly — this is pre-existing and was not changed

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