feat(news-research): RSS feed discovery, filter, and AI-context export

New sibling module to news/. Discovers topic-matched RSS feeds via
SearXNG (mana-search) or rel="alternate" probing of a site URL,
filters articles by keyword with a recency + title-match boost,
and exports the top hits as a markdown context block for the AI.

- API: /api/v1/news-research/{discover,validate,search,extract}
- Frontend: /news-research route + workbench ListView (compact card)
- Tool: research_news LLM tool (read-only, runs auto)
- Pin feeds → newsPreferences.customFeeds (encrypted) — covers the
  long-missing custom-RSS subscription gap; reading-list saves still
  go through articlesStore.saveFromUrl into the existing newsArticles
- shared-branding: new news-research entry + binoculars icon

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-branding/src/app-icons.ts

@@ -113,6 +113,9 @@ export const APP_ICONS = {
 	news: svgToDataUrl(
 		`<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><linearGradient id="ng" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" style="stop-color:#10b981"/><stop offset="100%" style="stop-color:#34d399"/></linearGradient></defs><rect width="100" height="100" rx="22" fill="url(#ng)"/><rect x="22" y="25" width="56" height="50" rx="4" stroke="white" stroke-width="4" fill="none"/><line x1="30" y1="38" x2="55" y2="38" stroke="white" stroke-width="3" stroke-linecap="round"/><line x1="30" y1="48" x2="70" y2="48" stroke="white" stroke-width="3" stroke-linecap="round"/><line x1="30" y1="58" x2="65" y2="58" stroke="white" stroke-width="3" stroke-linecap="round"/></svg>`
 	),
+	'news-research': svgToDataUrl(
+		`<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><linearGradient id="nr" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" style="stop-color:#0891b2"/><stop offset="100%" style="stop-color:#22d3ee"/></linearGradient></defs><rect width="100" height="100" rx="22" fill="url(#nr)"/><path d="M30 30a6 6 0 0 0-6 6v6M30 30a6 6 0 0 1 6 6v0M30 30v0" stroke="white" stroke-width="3" fill="none" stroke-linecap="round"/><circle cx="30" cy="30" r="3" fill="white"/><circle cx="52" cy="52" r="18" stroke="white" stroke-width="4" fill="none"/><line x1="65" y1="65" x2="78" y2="78" stroke="white" stroke-width="5" stroke-linecap="round"/><line x1="44" y1="50" x2="58" y2="50" stroke="white" stroke-width="3" stroke-linecap="round"/><line x1="44" y1="56" x2="54" y2="56" stroke="white" stroke-width="3" stroke-linecap="round"/></svg>`
+	),
 	guides: svgToDataUrl(
 		`<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><linearGradient id="gg" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" style="stop-color:#0d9488"/><stop offset="100%" style="stop-color:#0f766e"/></linearGradient></defs><rect width="100" height="100" rx="22" fill="url(#gg)"/><rect x="18" y="25" width="28" height="50" rx="3" fill="white" fill-opacity="0.15"/><rect x="54" y="25" width="28" height="50" rx="3" fill="white" fill-opacity="0.15"/><rect x="46" y="25" width="8" height="50" fill="white" fill-opacity="0.25"/><circle cx="27" cy="40" r="4" fill="white" fill-opacity="0.9"/><rect x="34" y="37" width="11" height="3" rx="1.5" fill="white" fill-opacity="0.6"/><circle cx="27" cy="52" r="4" fill="white" fill-opacity="0.55"/><rect x="34" y="49" width="9" height="3" rx="1.5" fill="white" fill-opacity="0.4"/><circle cx="27" cy="64" r="4" fill="white" fill-opacity="0.3"/><rect x="34" y="61" width="10" height="3" rx="1.5" fill="white" fill-opacity="0.25"/><path d="M60 52l6 7 12-14" stroke="white" stroke-width="4" stroke-linecap="round" stroke-linejoin="round" fill="none"/></svg>`
 	),

packages/shared-branding/src/mana-apps.ts

@@ -479,6 +479,23 @@ export const MANA_APPS: ManaApp[] = [
 		status: 'development',
 		requiredTier: 'guest',
 	},
+	{
+		id: 'news-research',
+		name: 'News Research',
+		description: {
+			de: 'RSS-Feeds finden & durchsuchen',
+			en: 'Find & search RSS feeds',
+		},
+		longDescription: {
+			de: 'Entdecke zum Thema passende RSS-Feeds, filtere die Artikel nach Stichworten und exportiere die Treffer als KI-Kontext oder in deine Leseliste.',
+			en: 'Discover topic-matched RSS feeds, filter articles by keyword, and export hits as AI context or into your reading list.',
+		},
+		icon: APP_ICONS['news-research'],
+		color: '#0891b2',
+		comingSoon: false,
+		status: 'development',
+		requiredTier: 'guest',
+	},
 	{
 		id: 'calc',
 		name: 'Calc',