refactor(documents): drop documentLocation binding from edit layouts; wire archive fields

frontend/src/lib/components/document/BulkDocumentEditLayout.svelte

@@ -67,7 +67,6 @@ let selectedReceivers = $state<Person[]>(untrack(() => initialReceivers));
 let dateIso = $state('');
 let tags = $state<Tag[]>([]);
 // Bulk-edit only — replace-on-non-blank semantics.
-let documentLocation = $state('');
 let archiveBox = $state('');
 let archiveFolder = $state('');
 
@@ -231,7 +230,6 @@ async function saveBulkEdit() {
 		tagNames: tags.map((t) => t.name),
 		senderId: senderId || null,
 		receiverIds: selectedReceivers.map((r) => r.id),
-		documentLocation: documentLocation || null,
 		archiveBox: archiveBox || null,
 		archiveFolder: archiveFolder || null
 	};
@@ -442,7 +440,6 @@ async function retrySave() {
 						/>
 						<DescriptionSection
 							bind:tags={tags}
-							bind:documentLocation={documentLocation}
 							bind:archiveBox={archiveBox}
 							bind:archiveFolder={archiveFolder}
 							hideTitle
@@ -494,7 +491,6 @@ async function retrySave() {
 					/>
 					<DescriptionSection
 						bind:tags={tags}
-						bind:documentLocation={documentLocation}
 						bind:archiveBox={archiveBox}
 						bind:archiveFolder={archiveFolder}
 						hideTitle

frontend/src/lib/components/document/BulkDocumentEditLayout.svelte.spec.ts

@@ -397,8 +397,8 @@ describe('BulkDocumentEditLayout — mode="edit"', () => {
 			initialEditEntries: [editEntry(1)]
 		});
 		const replaceBadges = container.querySelectorAll('[data-testid="field-label-badge-replace"]');
-		// sender + documentLocation + archiveBox + archiveFolder = 4
-		expect(replaceBadges.length).toBeGreaterThanOrEqual(4);
+		// sender + archiveBox + archiveFolder = 3
+		expect(replaceBadges.length).toBeGreaterThanOrEqual(3);
 	});
 
 	it('topbar reads "Massenbearbeitung" + "{count} werden bearbeitet" in edit mode', async () => {

frontend/src/lib/components/document/DocumentEditLayout.svelte

@@ -207,7 +207,8 @@ async function handleReplaceFile(e: Event) {
 					bind:tags={tags}
 					bind:currentTitle={currentTitle}
 					initialTitle={doc.title ?? ''}
-					initialDocumentLocation={doc.documentLocation ?? ''}
+					initialArchiveBox={doc.archiveBox ?? ''}
+					initialArchiveFolder={doc.archiveFolder ?? ''}
 					initialSummary={doc.summary ?? ''}
 					titleRequired={true}
 				/>