Feat/hasclaim cache - #147

closes #129

Greptile Summary

This PR adds an opt-in in-memory cache to StellarCred.hasClaim, a new invalidate API, full i18n support across all frontend pages via next-intl, a LangSwitcher component, and a tag-driven release workflow. The SDK cache itself is well-designed and the test coverage is thorough, but the implementation was merged with numerous incomplete edits throughout the codebase.

• SDK (index.ts): invalidate's closing brace is missing so the old configure is parsed as a nested function inside it; two StellarCred namespace exports exist on back-to-back lines; trustedIssuers is silently dropped in the cached code path.
• Frontend pages (holder, issuer, verify, apps, apps/[id], layout, SiteNav): Every file has at least one duplicate import, unclosed JSX expression, or duplicate JSX prop — all of which are TypeScript compile errors that prevent the app from building.
• verify/page.tsx: Newly added returnUrlIsValid / returnLabel computation accesses window.location.origin directly in the component body without an SSR guard, crashing server-side rendering of the /verify route.

Confidence Score: 1/5

Not safe to merge — the frontend does not compile and the SDK does not compile.

Every changed frontend page and the SDK itself contain TypeScript compile errors (duplicate imports, unclosed JSX, duplicate identifier declarations). The app cannot be built or deployed in this state. Additionally, the /verify page will crash server-side rendering on every request due to an unguarded window access at render time.

Files Needing Attention: All changed frontend pages need merge-artifact cleanup; frontend/packages/sdk/src/index.ts needs its invalidate function closed and the two duplicate StellarCred exports consolidated; frontend/app/verify/page.tsx needs the window.location.origin render-time access guarded.

sequenceDiagram
    participant App as Calling App
    participant SDK as @stellarcred/sdk
    participant Cache as In-Memory Cache
    participant RPC as Stellar RPC

    App->>SDK: hasClaim(wallet, claimType, opts)
    SDK->>SDK: buildCacheKey(wallet, claimType, minThreshold)
    alt "cacheEnabled && cache hit"
        SDK->>Cache: get(cacheKey)
        Cache-->>SDK: CacheEntry (value, expiresAt)
        SDK-->>App: cached boolean (no RPC)
    else cache miss or disabled
        alt minThreshold set
            SDK->>RPC: readCheckClaim(wallet, claimType, minThreshold)
        else binary claim
            SDK->>RPC: readIsVerified(wallet, claimType)
        end
        RPC-->>SDK: result
        alt cacheEnabled
            SDK->>Cache: "set(cacheKey, {value, expiresAt})"
        end
        SDK-->>App: result
    end

    App->>SDK: invalidate(wallet?, credentialType?)
    SDK->>Cache: delete matching entries

_{Reviews (7): Last reviewed commit: "Merge branch 'main' into feat/hasclaim-c..." | Re-trigger Greptile}