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/Home/SignalFeedView.swift

@@ -68,6 +68,27 @@ struct SignalFeedView: View {
         filteredStories.filter { readStoryIds.contains($0.id) }
     }
 
+    /// "All" shows a sectioned front page; specific pills show a flat list.
+    private var isDigest: Bool { selectedPill == .all }
+
+    /// Front-page digest: Top Stories + up to 3 per category section, deduped.
+    private var digest: (top: [StorySummary], sections: [(NewsSection, [StorySummary])]) {
+        let unread = filteredStories.filter { !readStoryIds.contains($0.id) }
+        let top = Array(unread.prefix(5))
+        var pool = Array(unread.dropFirst(5))
+        var out: [(NewsSection, [StorySummary])] = []
+        for section in NewsSection.sections {
+            var picked: [StorySummary] = [], rest: [StorySummary] = []
+            for s in pool {
+                if picked.count < 3 && s.inSection(section) { picked.append(s) }
+                else { rest.append(s) }
+            }
+            pool = rest
+            if !picked.isEmpty { out.append((section, picked)) }
+        }
+        return (top, out)
+    }
+
     private func captureSeenSnapshot() {
         let ids = (try? modelContext.fetch(FetchDescriptor<SeenStory>()))?.map(\.id) ?? []
         seenSnapshot = Set(ids)
@@ -99,7 +120,7 @@ struct SignalFeedView: View {
                     header
                     syncBar
                     topicPills
-                    columnHeaders
+                    if !isDigest { columnHeaders }   // sections carry their own headers
                     Divider().overlay(Palette.hairline)
                     feedList
                 }
@@ -127,13 +148,17 @@ struct SignalFeedView: View {
         }
         .task { CacheMaintenance.prune(modelContext) }   // bound the caches on launch
         .task(id: selectedPill) {
-            // A filter active but nothing matched in the loaded set → pull a few
-            // more pages so sparse pills still populate.
-            guard selectedPill != .all else { return }
             var pages = 0
-            while filteredStories.isEmpty && store.hasMore && pages < 8 {
-                await store.loadMore()
-                pages += 1
+            if selectedPill == .all {
+                // Front page: pull enough stories to fill the sections.
+                while store.stories.count < 100 && store.hasMore && pages < 5 {
+                    await store.loadMore(); pages += 1
+                }
+            } else {
+                // Sparse pill: pull a few more pages until something matches.
+                while filteredStories.isEmpty && store.hasMore && pages < 8 {
+                    await store.loadMore(); pages += 1
+                }
             }
         }
     }
@@ -235,18 +260,10 @@ struct SignalFeedView: View {
         List {
             if mainStories.isEmpty && readItems.isEmpty {
                 emptyState.plainBlackRow()
+            } else if isDigest {
+                digestContent
             } else {
-                ForEach(mainStories) { story in
-                    mainRow(story)
-                }
-                if mainStories.isEmpty {
-                    caughtUpRow.plainBlackRow()
-                }
-                if store.isLoadingMore {
-                    ProgressView().tint(Palette.orange)
-                        .frame(maxWidth: .infinity).padding(.vertical, 20).plainBlackRow()
-                }
-                readShelf
+                flatContent
             }
         }
         .listStyle(.plain)
@@ -260,6 +277,51 @@ struct SignalFeedView: View {
         }
     }
 
+    /// Flat list for a specific pill.
+    @ViewBuilder private var flatContent: some View {
+        ForEach(mainStories) { mainRow($0) }
+        if mainStories.isEmpty { caughtUpRow.plainBlackRow() }
+        if store.isLoadingMore {
+            ProgressView().tint(Palette.orange)
+                .frame(maxWidth: .infinity).padding(.vertical, 20).plainBlackRow()
+        }
+        readShelf
+    }
+
+    /// Sectioned front page for "All".
+    @ViewBuilder private var digestContent: some View {
+        let d = digest
+        sectionHeader("TOP STORIES", pill: nil)
+        ForEach(d.top) { mainRow($0) }
+        ForEach(d.sections, id: \.0.id) { section, stories in
+            sectionHeader(section.label.uppercased(), pill: section.pill)
+            ForEach(stories) { mainRow($0) }
+        }
+        readShelf
+    }
+
+    private func sectionHeader(_ label: String, pill: StoryPill?) -> some View {
+        HStack(alignment: .firstTextBaseline) {
+            Text(label)
+                .font(.system(size: 13, weight: .heavy, design: .monospaced))
+                .kerning(0.6)
+                .foregroundStyle(.white)
+            Rectangle().fill(Palette.orange).frame(width: 18, height: 2)
+            Spacer()
+            if let pill {
+                Button { selectedPill = pill } label: {
+                    HStack(spacing: 2) {
+                        Text("See all"); Image(systemName: "chevron.right").font(.system(size: 10, weight: .bold))
+                    }
+                    .font(.system(size: 12, weight: .bold))
+                    .foregroundStyle(Palette.orange)
+                }
+            }
+        }
+        .padding(.horizontal, 16).padding(.top, 22).padding(.bottom, 10)
+        .plainBlackRow()
+    }
+
     @ViewBuilder
     private func mainRow(_ story: StorySummary) -> some View {
         NavigationLink(value: story) {