[Ndifreke000]

Summary

Bundles fixes/verification for four FlowStar issues assigned to me.

• E2E: fix invalid CSS selector in contract-integration.spec.ts #902 — contract-integration.spec.ts's should validate recipient address format test used a malformed CSS selector (input[placeholder*="recipient" — missing closing ]), which threw a selector parse error. Replaced it with page.getByPlaceholder(/recipient/i).
• E2E: replace waitForLoadState('networkidle') on the stream detail page #901 — The stream detail page (/app/stream/*) polls continuously, so waitForLoadState('networkidle') never resolves and times out after 30s. Replaced the three networkidle waits scoped to that page (the stream-detail axe scan, and the Cancel-stream and Fee-estimate dialog beforeEach hooks in accessibility.spec.ts) with a wait for the loading skeleton (div.space-y-6.animate-pulse) to detach — a concrete, deterministic signal that the page has finished its initial render instead of waiting on network quiescence.
• bug: TopUpEvent missing #[soroban_sdk::contractevent] attribute in contract #139 — Verified honestly: already resolved in the current main. StreamTransferEvent has its closing brace and TopUpEvent already carries #[soroban_sdk::contractevent] (contracts/streaming/src/lib.rs lines ~305-325). No code change needed.
• Replace panic! with Soroban contracterror enum #1 — Verified honestly: already resolved in the current main. There are zero panic!() calls in contracts/streaming/src/lib.rs; a #[contracterror] pub enum StreamError already exists and all mutating entry points return Result<T, StreamError>. No code change needed.

Test plan

• Run e2e/contract-integration.spec.ts and confirm the recipient-format test no longer throws a selector parse error.
• Run e2e/accessibility.spec.ts chromium-desktop and confirm the stream-detail axe scan, Cancel-stream suite, and Fee-estimate suite no longer time out on networkidle.
• Confirm cargo test still passes for contracts/streaming (no contract code was changed).

Closes #902
Closes #901
Closes #139
Closes #1

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