Show premium membership requirements in game details

[zortos293]

Summary

• show a localized premium-membership warning in desktop game details when NVIDIA catalog metadata names a recognized paid tier
• mirror the requirement as a badge and explanatory note in controller-mode game details
• leave free, missing, and unrecognized metadata unlabeled so OpenNOW does not assert a restriction it cannot verify
• cover paid-tier detection and conservative unknown handling with automated tests

Requested by Discord user <@1499781612026728504> (lostt).

Metadata behavior

The existing catalog pipeline already requests NVIDIA's gfn.minimumMembershipTierLabel and maps it to GameInfo.membershipTierLabel. This change treats labels containing known paid GFN tier names (Founders, Priority, Performance, Premium, or Ultimate) as explicit paid requirements. Empty, Free, and unknown labels remain silent because the API does not provide a separate boolean entitlement flag and labels may vary by alliance or region.

Visual proof

The screenshots use the real app-details component in the running Electron renderer with representative Forza Horizon 6 metadata. The first supplies minimumMembershipTierLabel: "Performance"; the comparison omits requirement metadata to verify that no warning appears.

Paid requirement present

Requirement metadata unknown

Verification

• npm --prefix opennow-stable test — 604 passed
• npm --prefix opennow-stable run typecheck
• npm --prefix opennow-stable run lint — 0 warnings, 0 errors
• npm --prefix opennow-stable run build
• npm --prefix opennow-stable run locales:check
• launched the Electron app and rendered both requirement-present and metadata-unknown details states for the screenshots above

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