feat(billing): render cloud plans dynamically for three-tier pricing

[mekilis]

Summary

• Cloud now builds its plan list from the billing catalog (Pro, Premium, Enterprise) instead of a hardcoded two-plan default, enriched with default comparison copy and sorted deterministically (checkout plans by price ascending, contact-only plans last). Adds cloud_premium to the plan keys and checkout-eligible set.
• Plan cards render curated marketing highlights ("Everything in X, plus:") with a global expand/collapse chevron and fade, an "On trial"/"Current plan" pill, and a current-plan check.
• Comparison table columns are dynamic per plan count and scroll horizontally instead of clipping a third plan.
• Usage-period value drops to one line (16px) only for a year-spanning date range; short labels and "No active cycle" keep the normal size. Card contains any overflow as a fail-safe.
• Contact-only detection is centralized in one helper so plan sort ordering and checkout gating cannot drift.

Depends on the billing service returning the three cloud plans (cloud_premium seeded + linked on Maple).

Test plan

• Manage plan shows Pro, Premium, Enterprise in that order for cloud
• Premium/Enterprise comparison rows differ per the catalog; no third-column clip or wrap
• Chevron expands/collapses all cards to equal height; collapsed cards fade
• On-trial org shows the "On trial" pill on the trial plan; current plan shows the pill + check
• Annual usage period renders on one line without spilling into the next card

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Note

Medium Risk
Changes how cloud plans are listed and checkout/contact eligibility is resolved, which affects upgrade flows if the billing API is incomplete; UI-only elsewhere with no auth or payment logic changes.

Overview
Cloud plan catalog no longer maps a fixed two-card default onto the API. It lists whatever cloud plans billing returns (enriched with default comparison copy and highlights), sorts checkout plans by price with contact-only last, and treats an empty cloud catalog as unavailable. cloud_premium is added to plan keys and checkout-eligible keys.

Manage plan / catalog preview plan cards show curated "Everything in X, plus:" bullets (with supported-feature fallback), On trial / Current plan badges, a shared chevron to expand/collapse long highlight lists with a fade, and a footer so CTAs align. The compare table uses dynamic grid columns for N plans and horizontal scroll so a third tier is not clipped.

Billing overview applies a compact one-line 16px style only when the usage period string spans two years; cards use overflow hidden as a fail-safe.

planRequiresContact is centralized on PlanCatalogService for sort order and checkout gating. Specs are updated for dynamic cloud catalog behavior.

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[linear]

PDE-884