feat(planner): bring the plan tab and every trip dialog into the new look

The Plan tab was the last trip tab still in the old design. It now reads
like Bookings, Costs, Lists, Files and Collab, without losing a function:

- Day plan: each day is a card with a head band (day tile with weather,
  stay and rental pills, a "+" menu for place, stay, transport, transit
  and note), rows with "..." menus, white badges and a white route bar.
- Places column: add, search and filters in three rows, a show dropdown,
  category and rating filters, and a selection bar at the foot.
- Place inspector, day details and the stay editor on the shared dialog
  frame; the place form in the editor look with the name in the head band.
- Clicking a booking or transport anywhere on the plan opens the booking
  detail popup first; Edit leads to the editor. The popup is one host
  shared with the Bookings and Transports tabs.
- Files and Collab dialogs, notes, polls, links and chat moved to the same
  frame; shared DialogShell and dialogParts hold the building blocks.
- The map hover card shows the place photo and follows the theme.

Every new and reworded string is translated into all locales, and a few
older English leftovers (help center, cost split, import hints) with them.
Phone screens keep their own look.

client/src/components/Map/MapView.tsx

@@ -572,7 +572,7 @@ function MapContextMenuHandler({ onContextMenu }: { onContextMenu: ((e: L.Leafle
 
 // Module-level photo cache shared with PlaceAvatar
 import { getCached, isLoading, fetchPhoto, onThumbReady, getAllThumbs } from '../../services/photoService'
-import { isCustomPlaceImage, markerPhotoHtml, photoCacheKey, photoSourcesKey } from './placePhoto'
+import { isCustomPlaceImage, markerPhotoHtml, photoCacheKey, photoSourcesKey, placePhotoFull, placePhotoUrl } from './placePhoto'
 import { useAuthStore } from '../../store/authStore'
 import { useGeolocation } from '../../hooks/useGeolocation'
 import LocationButton from './LocationButton'
@@ -717,8 +717,8 @@ const MemoMarker = memo(function MemoMarker({
         },
         remove: () => { cleanupRef.current?.(); cleanupRef.current = null },
         click: () => onClickPlace(place.id),
-        mouseover: (e: any) => onHover(place, e.originalEvent.clientX, e.originalEvent.clientY),
-        mousemove: (e: any) => onHover(place, e.originalEvent.clientX, e.originalEvent.clientY),
+        mouseover: (e: any) => onHover({ ...place, photo: placePhotoFull(place) }, e.originalEvent.clientX, e.originalEvent.clientY),
+        mousemove: (e: any) => onHover({ ...place, photo: placePhotoFull(place) }, e.originalEvent.clientX, e.originalEvent.clientY),
         mouseout: onHoverOut,
       }}
       zIndexOffset={isSelected ? 1000 : 0}
@@ -1009,9 +1009,7 @@ export const MapView = memo(function MapView({
 
   const markers = useMemo(() => places.map((place) => {
     const isSelected = place.id === selectedPlaceId
-    const pck = photoCacheKey(place)
-    // A custom uploaded image wins over the auto-fetched thumb; otherwise fall back.
-    const photoUrl = isCustomPlaceImage(place.image_url) ? place.image_url! : ((pck && photoUrls[pck]) || place.image_url || null)
+    const photoUrl = placePhotoUrl(place, photoUrls)
     const orderNumbers = dayOrderMap[place.id] ?? null
     return (
       <MemoMarker
@@ -1369,6 +1367,7 @@ export const MapView = memo(function MapView({
         categoryColor={hoveredPlace.category_color}
         address={hoveredPlace.address}
         rating={hoveredPlace.rating_avg}
+        photo={hoveredPlace.photo}
       />
     )}
     </>