TUI: Add onboarding telemetry

[moirahuang]

Description

• Add low-cardinality telemetry for initial and post-logout TUI authentication journeys, including starts, device authorization readiness, browser launches, URL copies, failures, abandonment, and completion.
• Track retry attempts and deduplicate readiness and terminal outcome events without including authentication URLs, user codes, or raw errors.
• Report the TUI as the dedicated warp-agent-cli OAuth client while preserving warp-cli for generic SDK and fallback callers.

Plan: https://staging.warp.dev/drive/notebook/VEDTJkrbVxEnFZIwM5uC3A

Linked Issue

N/A — this is follow-up instrumentation and identity plumbing for the TUI onboarding flow.

Testing

• ./script/format --check
• cargo +1.92.0 check -p warp --features tui --lib
• cargo +1.92.0 check -p warp_tui --lib
• cargo +1.92.0 nextest run -p warp_core -p warp_server_client (101 passed)
• cargo +1.92.0 nextest run -p warp --features tui -E "test(/tui::telemetry::tests::/) or test(/tui::tests::/)" (16 passed)
• cargo +1.92.0 nextest run -p warp_tui -E "test(/root_view::tests::/) or test(/session::tests::/)" (17 passed; one existing leaky-process annotation)
• cargo +1.92.0 clippy -p warp -p warp_tui -p warp_core -p warp_server_client --lib --tests --features warp/tui -- -D warnings
• Targeted rustfmt and git diff --check
• I have manually tested my changes locally with ./script/run

Agent Mode

• Warp Agent Mode - This PR was created via Warp AI Agent Mode

Conversation: https://staging.warp.dev/conversation/b543d79e-e3d9-4f48-9516-50c2372eabc8

CHANGELOG-NONE

Co-Authored-By: Oz oz-agent@warp.dev

[oz-for-oss]

@moirahuang

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[moirahuang]

• TUI: Add onboarding telemetry #14620 👈 (View in Graphite)
• master

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[oz-for-oss]

Overview

This PR adds TUI onboarding telemetry events for authentication start, browser launch, copy URL, auth failure, abandonment, and terminal completion, plus changes the TUI-reported client ID used for server requests and OAuth device authorization.

Concerns

• The new warp-agent-cli client ID is now reported for all TUI HTTP requests and selected for the device OAuth flow, but the PR does not include or reference the required server-side registration/synchronization.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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[oz-for-oss]

⚠️ [IMPORTANT] This changes the TUI client ID reported on every Warp HTTP request, and the file notes these IDs must stay in sync with server constants. If warp-agent-cli is not already deployed server-side (including OAuth device-client registration), TUI login/API requests can fail or be misclassified; keep reporting warp-tui until that support is live, or land/link the matching server change.