Split save/mark-read swipe; move read stories into a collapsible shelf

- Left swipe: short reveals Save (tap), full swipe marks read. Right swipe
  still shares.
- Read stories leave the main feed and collapse into a "Read" shelf at the
  bottom (collapsed by default), shown as slim one-line rows; swipe to mark
  unread. An "all caught up" state shows when everything loaded is read.
- StoryRowView gains a compact presentation for the shelf.

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

Jarvis/Views/Home/StoryRowView.swift

@@ -9,10 +9,37 @@ struct StoryRowView: View {
     var isCached: Bool = false
     /// True once the story has been opened — drops the orange stripe and dims it.
     var isRead: Bool = false
+    /// Slim single-line presentation, used for the "Read" shelf.
+    var compact: Bool = false
 
     private var sourceNames: [String] { story.sources.map(\.name) }
 
     var body: some View {
+        if compact { compactBody } else { fullBody }
+    }
+
+    private var compactBody: some View {
+        HStack(spacing: 0) {
+            SignalStripe(score: story.signalScore, muted: true)
+            Text(story.headline)
+                .font(.system(size: 14, weight: .bold))
+                .foregroundStyle(Color(hex: "6A6A6A"))
+                .lineLimit(1)
+                .padding(.leading, 14)
+                .padding(.vertical, 11)
+            Spacer(minLength: 12)
+            Text("\(story.signalScore)")
+                .font(.system(size: 14, weight: .heavy, design: .monospaced))
+                .foregroundStyle(Color(hex: "474747"))
+                .padding(.trailing, 16)
+        }
+        .frame(maxWidth: .infinity, alignment: .leading)
+        .background(Color.black)
+        .overlay(alignment: .bottom) { Rectangle().fill(Palette.hairline).frame(height: 0.5) }
+        .contentShape(Rectangle())
+    }
+
+    private var fullBody: some View {
         HStack(alignment: .top, spacing: 0) {
             SignalStripe(score: story.signalScore, muted: isRead)