fix(demo): make News Sources configurable

[luokerenx4]

What changed

• add a representative News Collector configuration to the demo /api/config response
• implement an in-memory /api/config/news mutation handler so enablement, intervals, feed toggles, additions, and removals round-trip during a demo session
• mirror the production config guard for positive numeric settings, feed shapes, and valid URLs
• add handler coverage for initial feeds, successful mutation persistence, and invalid URL rejection

Why

The News Sources route used useConfigPage, but the demo config response omitted the entire news section and had no matching PUT handler. The page therefore rendered an empty fallback form, then silently discarded every attempted change: adding a feed cleared the form but left the list empty.

User impact

The public demo now presents a realistic enabled/paused RSS pair and lets users exercise the full News Collector configuration flow. Changes remain available for the current demo session while still following the demo banner's non-persistent contract.

Validation

• pnpm vitest run ui/src/demo/handlers/configNews.spec.ts ui/src/demo/handlers/configKeys.spec.ts (2 files, 4 tests passed)
• git diff --check
• npx tsc --noEmit
• cd ui && npx tsc -b
• pnpm test (358 passed, 1 skipped files; 3391 passed, 9 skipped tests)
• pnpm -F open-alice-ui build:demo
• real demo walkthrough: News Sources loaded Fed enabled and CoinDesk paused; adding Example Markets produced Saved and a stable 2 of 3 feeds active list

No external RSS fetch was run because this changes only the deterministic demo configuration contract, not the production collector or network parser.

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Project	Deployment	Actions	Updated (UTC)
openalice-demo	Ready	Preview, Comment	Jul 28, 2026 8:53pm