webui: RSS manual download / repull / rule-run controls

- Per-article Add button now sends the article key and reflects the
  grabbed state (✓ Added, disabled).
- Per-feed ⟳ repull plus a Refresh-all button.
- Per-rule ⏵ "Run now" that re-applies the rule to existing articles
  and reports how many were added.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/js/api.js

@@ -47,6 +47,8 @@ export const api = {
   deleteFeed: (name) => jpost('/api/rss/delete', { name }),
   saveRssRule: (rule) => jpost('/api/rss/rules', rule),
   deleteRssRule: (name) => jpost('/api/rss/rules/delete', { name }),
+  runRssRule: (name) => jpost('/api/rss/rules/run', { name }),
+  refreshFeeds: (name) => jpost('/api/rss/refresh', name ? { name } : {}),
   rssDownload: (item) => jpost('/api/rss/download', item),
   saveIndexer: (ix) => jpost('/api/indexers', ix),
   deleteIndexer: (name) => jpost('/api/indexers/delete', { name }),