fix(#674): paginate pools list with Load More + search/filter

[oluwaseyi1996-netizen]

Closes #674

Summary

Adds client-side Load More pagination to the pools list on PoolIntegration, plus a lightweight search input and status pill filter so the pagination is demonstrably compatible with search and filter features as required by the issue.

Acceptance criteria from #674

• Load More button at bottom of list
• Page size constant POOLS_PER_PAGE = 20
• Initial load shows only first page
• Load More appends the next page
• Load More is disabled once all (filtered) pools are visible
• Proper loading + empty-state handling
• Compatible with search and filter — both reset pagination to page 1

Changes

• web/app/components/PoolIntegration.tsx

  • Adds POOLS_PER_PAGE = 20 constant
  • Adds text search input + status pill (All / Active / Settled) backed by useId, sr-only label, role="group" with aria-label
  • Adds <button type="button">Load More</button> gated on filteredPools.length > POOLS_PER_PAGE so we do not render a noisy disabled button on small lists
  • Uses aria-label with dynamic remaining count and a role="status" aria-live="polite" line announcing Showing X of Y pools
  • Refresh resets pagination to page 1 of fresh data; filter changes reset to page 1 of the new view

• web/tests/components/PoolIntegration.test.tsx

  • Adds 7 tests covering initial page size, Load More increments, disabled state at exhaustion, no-button on small lists, status filter + search filter interact correctly with pagination, and refresh resetting to page 1
  • The duplicate-Settled text edge case (status pill + pool-card badge) is handled via getAllByText

Testing

• node_modules/.bin/vitest run tests/components/PoolIntegration.test.tsx → 23/23 pass
• node_modules/.bin/eslint app/components/PoolIntegration.tsx tests/components/PoolIntegration.test.tsx → clean
• node_modules/.bin/tsc --noEmit app/components/PoolIntegration.tsx → clean
• Pre-existing failures in tests/lib/formatting.test.ts, tests/lib/analytics.test.ts, tests/lib/disputes/feature-flag.test.tsx, tests/integration/navbar-auth.integration.test.tsx, tests/routes/smoke.test.tsx were confirmed pre-existing on main via git stash + vitest run (these are unrelated to this change)

Risks and follow-ups

• Pagination is client-side (the API still returns the full list). A follow-up could move to true server-side pagination in enhanced-stacks-api.fetchAllPools which already accepts page/pageSize.
• Stats still reflect the total fetched pool counts (not just visible), which is the right call for a "platform health" header.

Closes #674

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