adds buttons to export and delete all zips

src/routes/+page.svelte

@@ -3,7 +3,7 @@
     import Card from "$lib/components/Card.svelte";
     import ProcessedZipArchiveEditor from "$lib/components/ProcessedZipArchiveEditor.svelte";
     import ZipDropzone from "$lib/components/ZipDropzone.svelte";
-    import {extractZipArchives, type ProcessedZipArchive} from "$lib/zip-processing";
+    import {extractZipArchives, mergeProcessedZipArchive, type ProcessedZipArchive} from "$lib/zip-processing";
 
     const THUMBNAIL_WIDTH_STORAGE_KEY = "thumbnailWidth";
 
@@ -12,6 +12,7 @@
     let pendingZipCount = $state(0);
     let thumbnailWidth = $state(200);
     let thumbnailWidthHydrated = $state(false);
+    let archiveGeneration = 0;
 
     const clampThumbnailWidth = (value: number) => Math.min(400, Math.max(100, value));
 
@@ -37,24 +38,49 @@
         localStorage.setItem(THUMBNAIL_WIDTH_STORAGE_KEY, String(thumbnailWidth));
     });
 
+    const toArrayBuffer = (bytes: Uint8Array) => {
+        const copy = new Uint8Array(bytes.byteLength);
+        copy.set(bytes);
+        return copy.buffer;
+    };
+
+    const downloadPdfBytes = (bytes: Uint8Array, fileName: string) => {
+        const pdfBlob = new Blob([toArrayBuffer(bytes)], {type: "application/pdf"});
+        const objectUrl = URL.createObjectURL(pdfBlob);
+        const downloadLink = document.createElement("a");
+
+        downloadLink.href = objectUrl;
+        downloadLink.download = fileName.toLowerCase().endsWith(".pdf") ? fileName : `${fileName}.pdf`;
+        downloadLink.rel = "noopener";
+        downloadLink.click();
+        window.setTimeout(() => URL.revokeObjectURL(objectUrl), 1000);
+    };
+
     const handleFilesSelected = (files: File[]) => {
         selectedZipFiles = [...selectedZipFiles, ...files];
 
         for (const file of files) {
-            void processZipFile(file);
+            void processZipFile(file, archiveGeneration);
         }
     };
 
-    const processZipFile = async (file: File) => {
+    const processZipFile = async (file: File, generation: number) => {
         pendingZipCount += 1;
 
         try {
             const processedZipArchives = await extractZipArchives(file);
+
+            if (generation !== archiveGeneration) {
+                return;
+            }
+
             processedZipFiles = [...processedZipFiles, ...processedZipArchives];
         } catch (error) {
             console.error(`Failed to process ${file.name}`, error);
         } finally {
-            pendingZipCount -= 1;
+            if (generation === archiveGeneration) {
+                pendingZipCount -= 1;
+            }
         }
     };
 
@@ -63,12 +89,77 @@
             existingIndex === index ? archive : existingArchive,
         );
     };
+
+    const exportAllZipArchivesAsPdf = async () => {
+        for (const archive of processedZipFiles) {
+            try {
+                const mergedBytes = await mergeProcessedZipArchive(archive);
+                downloadPdfBytes(mergedBytes, archive.name);
+            } catch (error) {
+                console.error(`Failed to export archive ${archive.name}`, error);
+            }
+        }
+    };
+
+    const deleteAllZipArchives = () => {
+        archiveGeneration += 1;
+        selectedZipFiles = [];
+        processedZipFiles = [];
+        pendingZipCount = 0;
+    };
 </script>
 
 {#snippet content()}
     {#if selectedZipFiles.length === 0}
         <ZipDropzone onFilesSelected={handleFilesSelected}/>
     {:else}
+        <details class="fixed bottom-4 right-4 z-20">
+            <summary
+                    class="flex h-12 w-12 cursor-pointer list-none items-center justify-center rounded-full border border-primary-200 bg-white text-lg font-semibold text-primary-800 shadow-lg transition hover:border-primary-300 hover:bg-primary-50">
+                <span class="sr-only">Settings</span>
+                <span>⚙️</span>
+            </summary>
+
+            <div class="absolute bottom-14 right-0 w-72 rounded-xl border border-primary-100 bg-white p-4 shadow-lg">
+                <div class="flex flex-col gap-3">
+                    <div class="flex gap-2">
+                        <button
+                                class="flex-1 rounded-container bg-primary-900 px-3 py-2 text-[13px] font-bold leading-5 text-white shadow-sm transition hover:bg-primary-800 disabled:cursor-not-allowed disabled:bg-primary-300"
+                                type="button"
+                                disabled={processedZipFiles.length === 0}
+                                onclick={exportAllZipArchivesAsPdf}
+                        >
+                            Alle ZIP-Archive als PDF exportieren
+                        </button>
+
+                        <button
+                                class="flex-1 rounded-container bg-red-600 px-3 py-2 text-[13px] font-bold leading-5 text-white shadow-sm transition hover:bg-red-500 disabled:cursor-not-allowed disabled:bg-red-300"
+                                type="button"
+                                disabled={selectedZipFiles.length === 0}
+                                onclick={deleteAllZipArchives}
+                        >
+                            Alle ZIP-Archive löschen
+                        </button>
+                    </div>
+
+                    <label class="flex flex-col gap-2">
+                        <div class="flex items-center justify-between gap-3 text-sm font-medium text-primary-900">
+                            <span>Thumbnail Breite</span>
+                            <span class="tabular-nums text-primary-700">{thumbnailWidth}px</span>
+                        </div>
+
+                        <input
+                                class="w-full accent-primary-700"
+                                type="range"
+                                min="100"
+                                max="400"
+                                step="1"
+                                bind:value={thumbnailWidth}
+                        />
+                    </label>
+                </div>
+            </div>
+        </details>
         <div class="flex min-h-[calc(-180px+100vh)] w-full grow flex-col justify-center gap-4 px-4 py-6">
             <div class="mx-auto flex w-full flex-col gap-3">
                 {#if pendingZipCount > 0}
@@ -96,33 +187,6 @@
 <section class="px-4">
     <div class="flex flex-wrap items-center justify-between gap-3 py-6">
         <h1 class="h1 text-[20px] font-bold text-primary-900">beA-Edit</h1>
-
-        <details class="relative">
-            <summary
-                    class="flex cursor-pointer list-none items-center rounded-md border border-primary-200 bg-white px-3 py-2 text-sm font-semibold text-primary-800 shadow-sm transition hover:border-primary-300 hover:bg-primary-50">
-                <span class="sr-only">Settings</span>
-                <span>⚙️</span>
-            </summary>
-
-            <div class="absolute right-0 z-10 mt-2 w-64 rounded-xl border border-primary-100 bg-white p-4 shadow-lg">
-                <label class="flex flex-col gap-2">
-                    <div class="flex items-center justify-between gap-3 text-sm font-medium text-primary-900">
-                        <span>Thumbnail Breite</span>
-                        <span class="tabular-nums text-primary-700">{thumbnailWidth}px</span>
-                    </div>
-
-                    <input
-                            class="w-full accent-primary-700"
-                            type="range"
-                            min="100"
-                            max="400"
-                            step="1"
-                            bind:value={thumbnailWidth}
-                    />
-                </label>
-            </div>
-        </details>
     </div>
-
     <Card {content} class="h-full"/>
 </section>