Fix map tooltips, journey creation, and contributor avatars

- Map tooltips now respect light/dark mode via CSS variables
- Journey creation inherits cover image from first selected trip
- Only day-assigned places are synced to journey (no unplanned places)
- Place count in trip picker reflects assigned places only
- Contributor avatars shown in journey detail page
- Suggestion banner button visible in dark mode (!important override)
- Dashboard list view uses correct trips array and status label

client/src/index.css

@@ -299,7 +299,7 @@ body {
 
 /* ── iOS-style map tooltip ─────────────────────── */
 .leaflet-tooltip.map-tooltip {
-  background: rgba(9, 9, 11, 0.85);
+  background: var(--tooltip-bg);
   backdrop-filter: blur(8px);
   -webkit-backdrop-filter: blur(8px);
   border: none;
@@ -310,7 +310,7 @@ body {
   font-size: 11px;
   font-weight: 500;
   pointer-events: none;
-  color: #fff;
+  color: var(--text-primary);
 }
 .leaflet-tooltip.map-tooltip::before,
 .leaflet-tooltip-left.map-tooltip::before,