fix(journey): paginate Immich picker and group photos by date

The /search route was looping up to 20 pages server-side, returning a
blob of up to 1000 photos with no hasMore flag, which prevented the
client's existing ScrollTrigger infinite scroll from ever firing.

Now the route proxies the client's page param directly to Immich and
returns a single page plus hasMore, enabling full library browsing.

The photo picker grid now groups photos by takenAt date (already
present in every asset response) with a date label above each group,
restoring the date-oriented browsing from V2. Closes #674.

client/src/pages/JourneyDetailPage.tsx

@@ -1423,6 +1423,24 @@ function ScrollTrigger({ onVisible, loading }: { onVisible: () => void; loading:
   )
 }
 
+// ── Photo date grouping ───────────────────────────────────────────────────
+
+function groupPhotosByDate(photos: any[]): { date: string; label: string; assets: any[] }[] {
+  const map = new Map<string, any[]>()
+  for (const asset of photos) {
+    const key = asset.takenAt ? asset.takenAt.slice(0, 10) : '__unknown__'
+    if (!map.has(key)) map.set(key, [])
+    map.get(key)!.push(asset)
+  }
+  return [...map.entries()].map(([date, assets]) => ({
+    date,
+    label: date === '__unknown__'
+      ? 'Unknown date'
+      : new Date(date + 'T00:00:00').toLocaleDateString(undefined, { year: 'numeric', month: 'long', day: 'numeric' }),
+    assets,
+  }))
+}
+
 // ── Provider Picker ───────────────────────────────────────────────────────
 
 function ProviderPicker({ provider, userId, entries, trips, existingAssetIds, onClose, onAdd }: {
@@ -1732,51 +1750,60 @@ function ProviderPicker({ provider, userId, entries, trips, existingAssetIds, on
               </p>
             </div>
           ) : (
-            <div className="grid grid-cols-3 sm:grid-cols-4 md:grid-cols-5 gap-1.5">
-              {photos.map((asset: any) => {
-                const isSelected = selected.has(asset.id)
-                const alreadyAdded = existingAssetIds.has(asset.id)
-                return (
-                  <div
-                    key={asset.id}
-                    onClick={() => !alreadyAdded && toggleAsset(asset.id)}
-                    className={`relative aspect-square rounded-lg overflow-hidden ${
-                      alreadyAdded
-                        ? 'opacity-40 cursor-not-allowed'
-                        : isSelected
-                          ? 'ring-2 ring-zinc-900 dark:ring-white ring-offset-2 dark:ring-offset-zinc-900 cursor-pointer'
-                          : 'cursor-pointer'
-                    }`}
-                  >
-                    <img
-                      src={`/api/integrations/memories/${provider}/assets/0/${asset.id}/${userId}/thumbnail`}
-                      alt=""
-                      className="w-full h-full object-cover"
-                      loading="lazy"
-                      onError={e => {
-                        const img = e.currentTarget
-                        const original = `/api/integrations/memories/${provider}/assets/0/${asset.id}/${userId}/original`
-                        if (!img.src.includes('/original')) img.src = original
-                      }}
-                    />
-                    {alreadyAdded && (
-                      <div className="absolute top-1.5 right-1.5 w-5 h-5 rounded-full bg-zinc-500 text-white flex items-center justify-center">
-                        <Check size={12} />
-                      </div>
-                    )}
-                    {isSelected && !alreadyAdded && (
-                      <div className="absolute top-1.5 right-1.5 w-5 h-5 rounded-full bg-zinc-900 dark:bg-white text-white dark:text-zinc-900 flex items-center justify-center">
-                        <Check size={12} />
-                      </div>
-                    )}
-                    {asset.city && (
-                      <div className="absolute bottom-0 left-0 right-0 p-1 bg-gradient-to-t from-black/50 to-transparent">
-                        <p className="text-[8px] text-white truncate">{asset.city}</p>
-                      </div>
-                    )}
+            <div>
+              {groupPhotosByDate(photos).map(group => (
+                <div key={group.date}>
+                  <p className="text-[11px] font-medium text-zinc-500 dark:text-zinc-400 mb-2 mt-4 first:mt-0">
+                    {group.label}
+                  </p>
+                  <div className="grid grid-cols-3 sm:grid-cols-4 md:grid-cols-5 gap-1.5 mb-1">
+                    {group.assets.map((asset: any) => {
+                      const isSelected = selected.has(asset.id)
+                      const alreadyAdded = existingAssetIds.has(asset.id)
+                      return (
+                        <div
+                          key={asset.id}
+                          onClick={() => !alreadyAdded && toggleAsset(asset.id)}
+                          className={`relative aspect-square rounded-lg overflow-hidden ${
+                            alreadyAdded
+                              ? 'opacity-40 cursor-not-allowed'
+                              : isSelected
+                                ? 'ring-2 ring-zinc-900 dark:ring-white ring-offset-2 dark:ring-offset-zinc-900 cursor-pointer'
+                                : 'cursor-pointer'
+                          }`}
+                        >
+                          <img
+                            src={`/api/integrations/memories/${provider}/assets/0/${asset.id}/${userId}/thumbnail`}
+                            alt=""
+                            className="w-full h-full object-cover"
+                            loading="lazy"
+                            onError={e => {
+                              const img = e.currentTarget
+                              const original = `/api/integrations/memories/${provider}/assets/0/${asset.id}/${userId}/original`
+                              if (!img.src.includes('/original')) img.src = original
+                            }}
+                          />
+                          {alreadyAdded && (
+                            <div className="absolute top-1.5 right-1.5 w-5 h-5 rounded-full bg-zinc-500 text-white flex items-center justify-center">
+                              <Check size={12} />
+                            </div>
+                          )}
+                          {isSelected && !alreadyAdded && (
+                            <div className="absolute top-1.5 right-1.5 w-5 h-5 rounded-full bg-zinc-900 dark:bg-white text-white dark:text-zinc-900 flex items-center justify-center">
+                              <Check size={12} />
+                            </div>
+                          )}
+                          {asset.city && (
+                            <div className="absolute bottom-0 left-0 right-0 p-1 bg-gradient-to-t from-black/50 to-transparent">
+                              <p className="text-[8px] text-white truncate">{asset.city}</p>
+                            </div>
+                          )}
+                        </div>
+                      )
+                    })}
                   </div>
-                )
-              })}
+                </div>
+              ))}
               {/* Infinite scroll trigger */}
               {hasMore && !selectedAlbum && <ScrollTrigger onVisible={loadMorePhotos} loading={loadingMore} />}
             </div>