Simplify client downloads and add bulk selection

components/ProofingContext.tsx

@@ -59,6 +59,11 @@ export interface ProofingContextType {
   getFormattedList: () => string;
   /** Selected asset tokens in album order — the payload for a ZIP download. */
   getSelectedTokens: () => string[];
+  /** Number of assets in the current album. */
+  albumCount: number;
+  
+  /** Select every asset, or clear everything when all are already selected. */
+  toggleSelectAll: () => void;
   allowMailto: boolean;
   /**
    * `encodeEmail()` of the "email to photographer" recipient, when one is
@@ -284,6 +289,20 @@ export function ProofingProvider({
     }
   };
 
+  const toggleSelectAll = () => {
+    if (!sessionInit || submitted) return;
+  
+    editSelection((prev) => {
+      const allSelected =
+        albumTokens.length > 0 &&
+        albumTokens.every((token) => prev.has(token));
+  
+      return allSelected
+        ? new Set<string>()
+        : new Set(albumTokens);
+    });
+  };
+
   const getProofingUrl = () => {
     if (albumTokens.length === 0 || favorites.size === 0) {
       return typeof window !== 'undefined' ? window.location.href : '';
@@ -335,6 +354,8 @@ export function ProofingProvider({
         getProofingUrl,
         getFormattedList,
         getSelectedTokens,
+	albumCount: albumTokens.length,
+	toggleSelectAll,
         allowMailto,
         encodedMailto,
         downloadArchiveUrl,