feat(claw): evaluate button-vs-card feature flag for PostHog experiment

[kilo-code-bot]

Summary

Evaluates the button-vs-card PostHog feature flag in CreateInstanceCard so the SDK attaches $feature/button-vs-card to subsequent events (including claw_create_instance_clicked). Without this, the cloud app's PostHog SDK never evaluates the flag, so the experiment gets 0 conversions even though users are clicking.

The flag is evaluated in CreateInstanceCard (not ClawDashboard) so only users who can actually see the create CTA are marked as exposed. ClawDashboard also renders for users with existing instances, mid-onboarding, or viewing settings — evaluating there would dilute the experiment population.

Verification

• Verified formatting with oxfmt on changed files
• Typecheck passes (no new errors from this change)
• Confirmed useFeatureFlagVariantKey is exported by posthog-js/react (v1.360.2)

Visual Changes

N/A

Reviewer Notes

• No UI or behavior changes. The hook return value is intentionally unused — the sole purpose is flag evaluation so PostHog auto-attaches $feature/button-vs-card to tracked events.
• Users who reach CreateInstanceCard without coming through the landing page will get a variant assigned by the cloud app SDK. This is expected — PostHog uses the same hash for the same distinct_id, so the variant will be consistent.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• src/app/(app)/claw/components/ClawDashboard.tsx
• src/app/(app)/claw/components/CreateInstanceCard.tsx

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_{Reviewed by gpt-5.4-20260305 · 77,877 tokens}