feat(web): note anonymous usage data in onboarding and link the privacy policy

[juliusmarminge]

New users had no way of learning that T3 Code sends anonymous usage data, and the app never linked to the privacy policy.

• Onboarding: the first wizard step now has a short note under the computer list: "T3 Code collects anonymous usage data to help us improve it. To read more about how your data is used and how to opt out, see our privacy policy." There's no toggle, as agreed, and the opt-out details (T3CODE_TELEMETRY_ENABLED=false) live in the policy. On narrow screens the note sits under the Continue button.
• Settings › About: a new "Privacy policy" row with a View policy button. It's also searchable from settings search (privacy, telemetry, analytics, …).

Both links open https://t3.codes/privacy-policy in a new tab. Desktop's window-open handler sends that to the system browser.

Depends on #16563 (desktop honours the opt-out from the shell profile) and #16562 (the policy actually describes this data).

Screenshots

	Before	After
Onboarding
Settings › About

Onboarding on a 390px-wide viewport (after):

Verification

• vp lint on the touched files reports no new findings. apps/web typecheck passes.
• Checked in the web dev client at 1280px and 390px.
• Mobile already has Settings › Legal, which links the policy. Mobile has no onboarding wizard, so there's nothing to change there.

🤖 Generated with Claude Code (Claude Opus 5.5)

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	4.9 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	20.8 KiB	—	29.3 KiB	✅
Codex	Live turn messages	—	1	—	8	✅
Claude	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	21.2 KiB	—	29.3 KiB	✅
Claude	Live turn messages	—	2	—	8	✅

Baseline: unavailable · PR result: 2e66d5d · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 108.5 KiB
• Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Approved at 2e66d5d

Macroscope's review found this PR approvable — The changes add a static anonymous-usage disclosure, external privacy-policy links, and a searchable settings entry, with only minor responsive layout adjustments. They do not alter telemetry collection, defaults, data flows, or other production behavior.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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• Run ID: 7a35797a-0493-40c6-a0e8-e0018ee8faff

📥 Commits

Reviewing files that changed from the base of the PR and between 6f95ecf and 2e66d5d.

📒 Files selected for processing (1)

• apps/web/src/components/onboarding/WelcomeWizard.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• apps/web/src/components/onboarding/WelcomeWizard.tsx

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📝 Walkthrough

Walkthrough

The onboarding connection step now displays a privacy notice with a link to the privacy policy. Settings adds a searchable Privacy Policy entry that opens the same URL in a new tab.

Changes

Privacy policy disclosure and access

Layer / File(s)	Summary
Shared policy URL and onboarding disclosure apps/web/src/legalLinks.ts, apps/web/src/components/onboarding/WelcomeWizard.tsx	The connection step displays a privacy notice with a link to the privacy policy. The Continue button remains subject to its existing readiness and pairing-disabled conditions.
Searchable policy entry apps/web/src/components/settings/SettingsPanels.tsx, apps/web/src/components/settings/settingsSearch.ts	The About section adds a Privacy Policy row with a button that opens the policy in a new tab. Settings search includes privacy-related terms for the entry.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: 🔵 Low · up to 2e66d

Users may understand “anonymous” to mean their usage events cannot be linked over time. Align the wording with the telemetry behavior; this is a bounded disclosure risk rather than a demonstrated runtime failure.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the onboarding usage-data notice and privacy-policy link.
Description check	✅ Passed	The description explains the problem and changes, includes screenshots, and reports focused verification. It names dependent pull requests but does not provide the maintainer approval or scope rationa…

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
Review comments at @apps/web/src/components/onboarding/WelcomeWizard.tsx:
- Line 420: Replace “anonymous usage data” with accurate pseudonymous wording in
the onboarding description in WelcomeWizard and the About description in
SettingsPanels; use consistent wording at both sites.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: pingdotgg/t3code/.coderabbit.yaml
• Review profile: CHILL
• Plan: Team
• Run ID: 3bbbd896-d859-4cc9-a5d4-861d055d2277

📥 Commits

Reviewing files that changed from the base of the PR and between e9daeb6 and 4f3dd58.

📒 Files selected for processing (4)

• apps/web/src/components/onboarding/WelcomeWizard.tsx
• apps/web/src/components/settings/SettingsPanels.tsx
• apps/web/src/components/settings/settingsSearch.ts
• apps/web/src/legalLinks.ts

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 6 remain after this review.

Dismissing prior approval to re-evaluate 2e66d5d