Assisted-by: Claude Opus 4.6 via Claude Code

diff --git a/lib/ketchup/views/layout.rb b/lib/ketchup/views/layout.rb
index 129f0cd..6db5885 100644
--- a/lib/ketchup/views/layout.rb
+++ b/lib/ketchup/views/layout.rb
@@ -4,9 +4,10 @@ require "phlex"
 
 module Views
   class Layout < Phlex::HTML
-    def initialize(current_user:, title: "Ketchup")
+    def initialize(current_user:, title: "Ketchup", active_view: :list)
       @current_user = current_user
       @title = title
+      @active_view = active_view
     end
 
     def view_template(&)
@@ -35,6 +36,12 @@ module Views
           header(class: "site-header") do
             a(href: "/", class: "site-name") { "Ketchup" }
             nav(class: "site-nav") do
+              view_links.each do |path, label, view_key|
+                a(
+                  href: path,
+                  class: ["view-link", ("view-link--active" if @active_view == view_key)]
+                ) { label }
+              end
               a(href: "/series/new", class: "header-action") { "+ New" }
               a(href: "/users/#{@current_user[:id]}", class: "header-user") { @current_user[:login] }
             end
@@ -56,6 +63,15 @@ module Views
 
     private
 
+    def view_links
+      [
+        ["/", "List", :list],
+        ["/focus", "Focus", :focus],
+        ["/calendar", "Calendar", :calendar],
+        ["/agenda", "Agenda", :agenda],
+      ]
+    end
+
     def render_footer
       config = CONFIG
       parts = []
diff --git a/public/css/app.css b/public/css/app.css
index 0bd1d2e..393de28 100644
--- a/public/css/app.css
+++ b/public/css/app.css
@@ -79,6 +79,21 @@ h2 { font-size: var(--step-0); font-weight: 600; }
   color: #555;
 }
 
+.view-link {
+  font-size: var(--step--1);
+  color: #999;
+  text-decoration: none;
+}
+
+.view-link:hover {
+  color: #555;
+}
+
+.view-link--active {
+  color: #1a1a1a;
+  font-weight: 600;
+}
+
 /* -------------------- */
 /* Site footer */
 /* -------------------- */
diff --git a/test/test_web.rb b/test/test_web.rb
index 56b1d5b..bf3a430 100644
--- a/test/test_web.rb
+++ b/test/test_web.rb
@@ -535,6 +535,19 @@ class TestWeb < Minitest::Test
     assert_includes last_response.body, 'x-data="panel"'
   end
 
+  def test_header_shows_view_nav
+    get "/", {}, auth_headers
+    assert_includes last_response.body, 'href="/"'
+    assert_includes last_response.body, 'href="/focus"'
+    assert_includes last_response.body, 'href="/calendar"'
+    assert_includes last_response.body, 'href="/agenda"'
+  end
+
+  def test_header_highlights_active_view
+    get "/", {}, auth_headers
+    assert_includes last_response.body, "view-link--active"
+  end
+
   def test_csrf_rejects_post_without_token
     get "/", {}, auth_headers  # establish session
     post "/series", {