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/styles/mapillary.css

@@ -110,31 +110,6 @@
   pointer-events: none;
 }
 
-/* ── Keyless empty state ─────────────────────────────────────────────────── */
-.mly-keyless {
-  display: flex;
-  flex-direction: column;
-  gap: 8px;
-  padding: 10px 12px;
-  border: 1px solid rgba(255, 179, 0, 0.45);
-  border-radius: 9px;
-  background: rgba(255, 179, 0, 0.06);
-}
-
-.mly-keyless-text {
-  margin: 0;
-  font-family: var(--font-sans);
-  font-size: 0.72rem;
-  line-height: 1.4;
-  color: var(--text-primary);
-}
-
-.mly-keyless-text code {
-  font-family: var(--font-mono);
-  font-size: 0.66rem;
-  color: #ffb300;
-}
-
 /* ── Query ───────────────────────────────────────────────────────────────── */
 .mly-query {
   display: flex;