sdk-react: SSR-safe hooks (Next.js App Router compat)

[truthixify]

Extra labels: react, nextjs, dx
Tier: M (2-4 days) | Type: feature

Context. sdk-react hooks reach for window on module load, breaking Next.js App Router server components. Guard every DOM access; ship a use client marker where required.

Scope.

• Audit each hook file for module-scope DOM refs.
• Move DOM refs behind useEffect / lazy init.
• Add "use client" pragma where needed.
• Example: examples/stellar-nextjs-app-router/.

Acceptance.

• pnpm build on the Next.js example passes without SSR errors
• Existing CRA + Vite examples still work
• Tree-shakes: server bundle contains no DOM refs

Files. packages/sdk-react/src/hooks/, examples/stellar-nextjs-app-router/ (new).

[DSOTec]

@DSOTec has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I would like to work on this issue. Please kindly assign.

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