Default view stays the all-feeds joined article list, now with a sidebar
listing every subscribed feed so a reader can pin down to one feed's
articles. Filtering happens server-side (list_ranked_articles now takes
an optional feed_id).
Pulled in the sidebar/badge/scroll_area (plus their sheet/skeleton/
tooltip/separator dependencies) components via `dx components add`
instead of hand-rolling nav/tag/scroll markup, matching this project's
existing pattern of using the Dioxus component library over raw
elements (see button/input).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PqTJmazHBQK878vjQ4JnnF
