ui(mapillary): drop the keyless empty state

The panel no longer shows a separate keyless call-to-action; the fieldset
gate and the layer-row tooltip already cover the missing-key case. The
planner flag is tri-state (null until status answers).

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/ui/templates/layer-panels.html

@@ -85,10 +85,6 @@
         <button class="panel-collapse-btn" data-collapse-target="mapillary-panel" title="Expand panel">◀</button>
       </div>
       <div id="mly-body" class="mly-body">
-        <div id="mly-keyless" class="mly-keyless" hidden>
-          <p class="mly-keyless-text">Street Level needs a free Mapillary client token (<code>MAPILLARY_CLIENT_TOKEN</code>). Coverage, photos and queries stay off until one is added.</p>
-          <button id="mly-keyless-btn" class="scene-btn" type="button">ADD KEY IN POWER UP</button>
-        </div>
         <fieldset id="mly-controls" class="mly-controls">
           <div class="cctv-controls">
             <button id="mly-enable-btn" class="scene-btn" type="button" aria-pressed="false" title="Turn the Street Level layer on or off">STREET LEVEL OFF</button>