Add Pendo track events for key user interactions

[novus-by-pendo-dev]

Summary

• Adds 9 pendo.track() events across the BrowseGPT extension to capture key user interactions
• Events instrumented: user_signed_up, user_logged_in, user_logged_out, profile_updated, message_sent, command_executed, chat_created, chat_deleted, chat_search_executed
• Each event includes relevant metadata properties for analytics segmentation (auth provider, chat IDs, message lengths, search terms, etc.)
• Chat search tracking is debounced (500ms) to prevent over-firing on every keystroke

Test plan

• Verify user_signed_up fires with correct auth_provider after successful OAuth sign-up via Google, GitHub, and Facebook
• Verify user_logged_in fires with correct auth_provider after successful OAuth login
• Verify user_logged_out fires before Pendo session is cleared on logout
• Verify profile_updated fires after successful profile form submission with correct is_first_profile_completion flag
• Verify message_sent fires on successful GPT response with message/response lengths
• Verify command_executed fires when a slash command is used with command name and search query
• Verify chat_created fires when a new chat is created with correct total count
• Verify chat_deleted fires when a chat is deleted with correct remaining count and active chat flag
• Verify chat_search_executed fires after 500ms debounce when searching chats, with result count
• Confirm no events fire when Pendo is not loaded (optional chaining prevents errors)

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