Turn "All" into a sectioned news front page

Instead of one long firehose, "All" now renders Apple/Google-News-style:
a Top Stories lead block, then category sections (World, Politics, Business,
AI, Technology, Africa, Sport, Science, Entertainment, Health, Lifestyle) with
the top few stories each and a "See all" jump to the matching pill. Sections are
built from backend tags[]; specific pills keep the flat list. "All" preloads up
to ~100 stories to fill sections.

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

Jarvis/Views/Shared/Theme.swift

@@ -224,4 +224,35 @@ extension StorySummary {
     func matches(_ pill: StoryPill) -> Bool {
         pill == .all || !effectiveTags.isDisjoint(with: pill.slugs)
     }
+
+    func inSection(_ section: NewsSection) -> Bool {
+        !effectiveTags.isDisjoint(with: section.slugs)
+    }
+}
+
+// MARK: - News sections (the "All" front page)
+//
+// Groups the firehose into Apple/Google-News-style sections. A story lands in
+// the first section (by this order) whose slugs it carries; `pill` powers "See all".
+
+struct NewsSection: Identifiable {
+    let id: String
+    let label: String
+    let slugs: Set<String>
+    let pill: StoryPill?
+
+    static let sections: [NewsSection] = [
+        .init(id: "us", label: "US", slugs: ["united-states"], pill: .unitedStates),
+        .init(id: "world", label: "World", slugs: ["world-news", "news", "news-and-current-affairs"], pill: nil),
+        .init(id: "politics", label: "Politics", slugs: ["politics", "human-rights", "investigative"], pill: nil),
+        .init(id: "business", label: "Business", slugs: ["business", "finance", "fintech", "cryptocurrency", "blockchain", "entrepreneur", "startups", "real-estate"], pill: nil),
+        .init(id: "ai", label: "AI", slugs: ["artificial-intelligence", "machine-learning", "robotics"], pill: .ai),
+        .init(id: "technology", label: "Technology", slugs: ["technology", "programming-and-software-development", "cybersecurity", "security", "web-design-and-ui-ux", "wordpress-and-web-development", "privacy-and-data-protection", "cloud-computing"], pill: .tech),
+        .init(id: "africa", label: "Africa", slugs: ["africa", "east-africa", "south-africa", "uganda"], pill: nil),
+        .init(id: "sport", label: "Sport", slugs: ["sports", "esports", "formula-1"], pill: .sport),
+        .init(id: "science", label: "Science", slugs: ["science", "astronomy", "environment", "green-technology", "sustainability"], pill: nil),
+        .init(id: "entertainment", label: "Entertainment", slugs: ["entertainment", "music", "pop-culture", "video-game", "arts-and-culture", "books-and-literature"], pill: nil),
+        .init(id: "health", label: "Health", slugs: ["health", "health-and-wellness", "mental-health"], pill: nil),
+        .init(id: "lifestyle", label: "Lifestyle", slugs: ["lifestyle", "food-and-drink", "travel", "gardening", "outdoor-and-hiking", "parenting-and-family", "interior-design-and-home-decor", "photography", "self-improvement-and-personal-development", "education", "e-learning"], pill: nil),
+    ]
 }