Validate RSS feed URLs before saving

[luokerenx4]

Summary

• validate new RSS feed URLs in the News Sources form before submitting
• show an accessible inline error and keep Add Feed disabled for invalid URLs
• preserve the existing trim-on-save behavior and add focused component coverage

Why

The production news configuration schema requires z.string().url(), but the UI previously checked only that the field was non-empty. Values such as not-a-url enabled Add Feed and were rejected only after the request reached the server, without any field-level explanation.

User impact

Users now get immediate, actionable feedback while entering a feed URL. A valid URL clears the error and enables submission, so the UI contract matches the production validation boundary.

Verification

• pnpm exec vitest run ui/src/pages/NewsCollectorPage.spec.tsx — 2 passed
• npx tsc --noEmit
• cd ui && npx tsc -b
• pnpm -F open-alice-ui build:demo
• pnpm test — 3390 passed, 9 skipped
• Real Demo route (/settings/news-collector): verified not-a-url shows the inline alert and keeps Add Feed disabled; replacing it with https://example.com/rss.xml clears the alert and enables the button
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
openalice-demo	Ready	Preview, Comment	Jul 28, 2026 8:59pm