fix: stream not-found, future-stream progress, and infinite scroll

[princessoladele]

Summary

Fixes three issues in a single PR. All changes are isolated and independently verifiable.

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#483 — Stream detail page: blank screen for non-existent stream IDs

Root cause: getStreamedAmount was referenced by getRemainingBalance and imported by StreamProgressBar but was never defined/exported from src/lib/sorostream.ts. Every stream detail page render threw a ReferenceError, which bypassed the existing "Stream Not Found" UI entirely and left the user on a blank screen.

Fix: Export getStreamedAmount from src/lib/sorostream.ts with correct semantics:

• Active stream → floor(flowRate × elapsed_seconds)
• Paused stream → frozen at the moment of pausing
• Future stream (now < startTime) → 0 (clamps elapsed to 0)
• Ended stream → capped at endTime
• Cancelled stream → capped at cancelledAt timestamp when available

Tests: New file src/lib/__tests__/getStreamedAmount.test.ts (14 assertions).

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#482 — Future streams show non-zero progress on dashboard card

Root cause: StreamProgressBar computed elapsed = now - start and relied on an implicit Math.max(0, …) to prevent a negative percentage. The intent was not explicit, and the missing getStreamedAmount export meant the cancelled-stream path was also broken.

Fix: Replace the implicit clamp with an explicit effectiveNow = Math.min(Math.max(now, start), end) so the progress is unambiguously bounded to [start, end] regardless of stream state. Future streams always display exactly 0%.

Tests: Two new cases added to components/__tests__/StreamProgressBar.test.tsx.

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#457 — Infinite scroll: tests failing with IntersectionObserver not defined

Root cause: The StreamHistory component already implements infinite scroll via an IntersectionObserver sentinel, but jsdom (the vitest test environment) does not ship IntersectionObserver. All four infinite-scroll test cases were failing with a ReferenceError.

Fix: Add a no-op IntersectionObserver stub to src/test/setup.ts (the global vitest setup file). The stub never fires intersection callbacks, which is sufficient for the tests to render the sentinel element and assert on its presence without triggering the observer.

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Test results

Metric	Before	After
Tests passed	251	269
Tests failed	10	0
Test files (build errors, pre-existing)	3	3

Pre-existing failures in WalletConnect.test.tsx, sessionError.test.ts, and MilestoneNotifications.test.tsx are caused by duplicate exports in src/lib/freighter.ts — unrelated to this PR.

Files changed

File	Change
src/lib/sorostream.ts	Add getStreamedAmount export
components/StreamProgressBar.tsx	Explicit [start, end] clamping
src/test/setup.ts	Add IntersectionObserver stub
src/lib/__tests__/getStreamedAmount.test.ts	New — 14 test cases
components/__tests__/StreamProgressBar.test.tsx	2 new future-stream test cases
components/__tests__/StreamHistory.test.tsx	No logic change; tests now pass
components/StreamHistory.tsx	No logic change

closes #483
closes #482
closes #457

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