feat(billing): add Max plan to nova with cancel/resume flow

[MaheshtheDev]

Integrate the new api_max plan ($100/mo, $130 credits) from mono into the
nova web app, mirroring mono's tier semantics.

• Tiers: insert api_max between pro and scale; resolves to Pro-tier for feature gates while displaying as "Max" (queries.ts, use-token-usage)
• Billing page: Max plan card ("Most Popular"), checkout/cancel/invoice wiring; advanced carousel page now 3-up (Max/Scale/Enterprise); Scale builds on Max
• Carousel auto-opens to the page holding the current plan (Max/Scale/ Enterprise users land on their own card instead of Free+Pro)
• Cancel: retention dialog listing what you lose + type-to-confirm "CANCEL"
• Cancel/resume state mirroring console: detect canceledAt-scheduled cancellation, show "Cancelling" pill + "Cancels on {date} · N days left", and a "Resume plan" (uncancel) action

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
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[MaheshtheDev]

• feat(billing): add Max plan to nova with cancel/resume flow #1024 👈 (View in Graphite)
• main

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[claude]

Claude finished @MaheshtheDev's task in 1m 1s —— View job

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Re-reviewing PR after new commits

• Check if previous timestamp normalization issue was fixed
• Review the fix for correctness
• Check for any new issues introduced
• Update review summary

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Overview: Re-reviewed after commit 594a9da which addresses the timestamp normalization bug from the previous review.

Fix verified: The cancelEndsAt calculation at billing.tsx:594-595 now correctly uses normalizeTimestamp() before computing the days remaining. This ensures Stripe timestamps (which may be in seconds) are properly converted to milliseconds before comparison with Date.now().

Issues found: None — the previous issue has been fixed correctly.

Score: 10/10

Clean implementation. The fix properly reuses the existing normalizeTimestamp helper, and the days calculation now works correctly regardless of whether the backend returns Unix timestamps in seconds or milliseconds. Ready to ship.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	supermemory-mcp	53c971a	May 31 2026, 07:11 PM

[claude]

Overview: Adds Max plan ($100/mo) between Pro and Scale with full cancel/resume flow mirroring the console experience.

Issues found:

• One potential timestamp normalization bug in the cancel countdown calculation — if the backend returns Unix timestamps in seconds (common for Stripe), the "days left" display will be incorrect. See inline comment.

Score: 9/10

Clean implementation overall. The plan tier ordering is consistent across all files, the cancel confirmation UX with type-to-confirm is solid, and the resume flow properly uses the autumn SDK's uncancel action. The auto-open carousel logic for advanced plan users is a nice touch. Just needs the timestamp fix before shipping.

[graphite-app]

Merge activity

• May 31, 7:09 PM UTC: sreedharsreeram added this pull request to the Graphite merge queue.
• May 31, 7:11 PM UTC: Merged by the Graphite merge queue.