feat(lookout): nudge never-tracked users to Lookout on the /rng page

app/controllers/daily_rolls_controller.rb

@@ -49,6 +49,7 @@ def leaderboard
         @viewer_rank = @viewer_date_roll.rank
         @viewer_page = ((@viewer_rank - 1) / PAGE_SIZE) + 1
       end
+      @lookout_banner_origin = lookout_banner_origin
     else
       @anonymous_roll = AnonymousRoll.new(cookies).today
     end
@@ -101,6 +102,22 @@ def roll_for_anonymous
                            locals: { roll: roll, just_rolled: just_rolled, anonymous: true }) ]
   end
 
+  # Re-engagement: the daily roll pulls even people who never track time back
+  # here, so signed-in viewers who haven't linked Hackatime get a banner nudging
+  # them toward Lookout. Returns where /auth/hackatime should send them afterward
+  # (their most recent project, so the on-project record flow is one click away),
+  # or nil when the banner shouldn't show. Kept cheap on purpose — keyed off the
+  # identity association, never a live Hackatime sync, which would add an API call
+  # to this hot path. Broadening to "linked but 0 hours" needs a cached hours
+  # signal first.
+  def lookout_banner_origin
+    return unless Flipper.enabled?(:lookout, current_user)
+    return if current_user.hackatime_identity.present?
+
+    recent_project = current_user.projects.order(created_at: :desc).first
+    recent_project ? project_path(recent_project) : rng_path
+  end
+
   # rng ships with the week 2 release; until then it 404s for everyone.
   def require_week_2_release
     head :not_found unless Flipper.enabled?(:week_2_release, current_user)

app/views/layouts/application.html.erb

@@ -106,6 +106,7 @@
     <% end %>
     <div id="flash-region"><%= render "shared/flash" %></div>
     <%= render Onboarding::GuestBannerComponent.new unless @hide_sidebar %>
+    <%= render "shared/lookout_banner", origin: @lookout_banner_origin if @lookout_banner_origin %>
 <% if @_admin_layout %>
 <div class="admin-content"><%= yield %></div>
 <% else %>

app/views/shared/_lookout_banner.html.erb

@@ -0,0 +1,18 @@
+<%# Top sticky re-engagement banner. Reuses the .guest-banner styling — the
+    yellow bar shown when you don't have a Hack Club account (see
+    components/_onboarding.scss) — so it sits at the top of the screen exactly
+    like that banner. Rendered from the application layout when the controller
+    set @lookout_banner_origin (currently only on /rng, for signed-in viewers
+    who are behind :lookout and haven't linked Hackatime yet).
+    Locals: origin (required — where /auth/hackatime returns them). %>
+<div class="guest-banner" id="lookout-banner" role="status">
+  <p class="guest-banner__copy">
+    the easy way to log your build time — just hit record in your browser with Lookout. no install, no editor extension.
+  </p>
+  <%= button_to "Log hours with Lookout", "/auth/hackatime",
+                method: :post,
+                params: { origin: origin },
+                class: "guest-banner__cta",
+                form: { class: "guest-banner__form" },
+                data: { turbo: false } %>
+</div>