Fix tap-to-open on cards, and move the list to the library design

Two changes.

Tapping a card did nothing. LibraryCard carried its own press-scale
effect via onLongPressGesture(minimumDuration: 0), and a zero-duration
long press fires immediately and swallows the tap the host attaches. It
was invisible in the prototype because nothing was listening for taps
there. LibraryCard is now purely presentational and the grid wraps it in
a Button with the existing RowPressStyle, which gets the same scale
without competing for the gesture.

The list now speaks the same design as the cards: paper ground, the
color chip where the favicon was, serif quoted title, monospaced
domain/date, serif-italic AI summary, monospaced tag chips. Everything
the old row carried is still there — unread state, excerpt, tags,
podcast affordance, reading progress — along with all swipe actions,
since it is still a List.

BookmarkListRow takes a style rather than being rewritten, because the
Tags and Search screens use the same row and should not be silently
restyled by a change aimed at the bookmarks screen.

The tag filter strip moved up to BookmarksView. Both layouts speak the
same language now, so the strip belongs to the screen rather than to one
mode — which also retires the rule that leaving cards mode had to clear
the tag filter to stop it becoming invisible.

The tag chip strip fades at its trailing edge; without it a tag clipped
mid-word reads as broken text rather than as something scrollable.

Verified in both layouts and both color schemes against the live server.
Full suite passes (16 tests).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JgLHztZGaEHvS3KNeGQmRM

Marks/Views/BookmarkListRow.swift

@@ -3,9 +3,16 @@ import SwiftUI
 /// Full-featured list row used by BookmarksView, TagBookmarksView, and SearchView.
 /// Owns podcast and episode-picker sheet state; parent owns BrowserView sheet.
 struct BookmarkListRow: View {
+    /// Which visual language the row speaks. `.library` is the paper design
+    /// used by the bookmarks screen; `.classic` is the system-styled row the
+    /// Tags and Search screens still use, so redesigning one doesn't silently
+    /// restyle the others.
+    enum Style { case classic, library }
+
     let bookmark: Bookmark
     let viewModel: BookmarksViewModel
     var readingProgress: Double = 0
+    var style: Style = .classic
     let onOpen: () -> Void
     var onEdit: (() -> Void)? = nil
 
@@ -14,15 +21,13 @@ struct BookmarkListRow: View {
     @State private var episodePickerBookmark: Bookmark?
 
     var body: some View {
-        BookmarkRow(
-            bookmark: bookmark,
-            readingProgress: readingProgress,
-            onPodcast: handlePodcast
-        )
+        row
         .contentShape(Rectangle())
         .onTapGesture { onOpen() }
-        .listRowInsets(EdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 16))
+        .listRowInsets(EdgeInsets(top: 0, leading: 18, bottom: 0, trailing: 18))
         .listRowSeparator(.visible)
+        .listRowSeparatorTint(style == .library ? Paper.rule.opacity(0.5) : nil)
+        .listRowBackground(style == .library ? Paper.sheet : nil)
         // Delete is destructive and not undoable — require an explicit tap on the
         // revealed button rather than letting a single full swipe delete instantly.
         .swipeActions(edge: .trailing, allowsFullSwipe: false) {
@@ -63,6 +68,24 @@ struct BookmarkListRow: View {
         )
     }
 
+    @ViewBuilder
+    private var row: some View {
+        switch style {
+        case .classic:
+            BookmarkRow(
+                bookmark: bookmark,
+                readingProgress: readingProgress,
+                onPodcast: handlePodcast
+            )
+        case .library:
+            LibraryListRow(
+                bookmark: bookmark,
+                readingProgress: readingProgress,
+                onPodcast: handlePodcast
+            )
+        }
+    }
+
     private func handlePodcast() {
         launchPodcast(
             for: bookmark,