feat(#221): wire tagOp URL param from server to SearchFilterBar

Reads ?tagOp=OR from URL in +page.server.ts, passes it to the backend
search endpoint, and surfaces it via the filters return. +page.svelte
initialises tagOperator state from filters, writes it back to the URL
in triggerSearch(), and binds it to SearchFilterBar.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/+page.server.ts

@@ -29,6 +29,7 @@ export async function load({ url, fetch }) {
 		? (rawDir as ValidDir)
 		: 'desc';
 	const tagQ = url.searchParams.get('tagQ') || '';
+	const tagOp = url.searchParams.get('tagOp') === 'OR' ? 'OR' : 'AND';
 
 	const isDashboard = !q && !from && !to && !senderId && !receiverId && !tags.length && !tagQ;
 
@@ -48,6 +49,7 @@ export async function load({ url, fetch }) {
 								receiverId: receiverId || undefined,
 								tag: tags.length ? tags : undefined,
 								tagQ: tagQ || undefined,
+								tagOp: tagOp === 'OR' ? 'OR' : undefined,
 								sort,
 								dir: dir || undefined
 							}
@@ -147,7 +149,7 @@ export async function load({ url, fetch }) {
 				senderName: senderObj?.displayName ?? '',
 				receiverName: receiverObj?.displayName ?? ''
 			},
-			filters: { q, from, to, senderId, receiverId, tags, sort, dir, tagQ },
+			filters: { q, from, to, senderId, receiverId, tags, sort, dir, tagQ, tagOp },
 			error: null as string | null
 		};
 	} catch (e) {
@@ -166,7 +168,7 @@ export async function load({ url, fetch }) {
 			readyDocs: [],
 			weeklyStats: null,
 			initialValues: { senderName: '', receiverName: '' },
-			filters: { q, from, to, senderId, receiverId, tags, sort, dir, tagQ },
+			filters: { q, from, to, senderId, receiverId, tags, sort, dir, tagQ, tagOp },
 			error: 'Daten konnten nicht geladen werden.' as string | null
 		};
 	}

frontend/src/routes/+page.svelte

@@ -26,6 +26,9 @@ let tagNames = $state<{ name: string; id?: string; color?: string; parentId?: st
 let sort = $state(untrack(() => data.filters?.sort || 'DATE'));
 let dir = $state(untrack(() => data.filters?.dir || 'desc'));
 let tagQ = $state(untrack(() => data.filters?.tagQ || ''));
+let tagOperator = $state<'AND' | 'OR'>(
+	untrack(() => (data.filters?.tagOp as 'AND' | 'OR') || 'AND')
+);
 
 const hasAdvancedFilters = (filters: typeof data.filters) =>
 	(filters?.tags?.length ?? 0) > 0 ||
@@ -49,6 +52,7 @@ function triggerSearch() {
 	if (sort) params.set('sort', sort);
 	if (dir) params.set('dir', dir);
 	if (tagQ) params.set('tagQ', tagQ);
+	if (tagOperator === 'OR') params.set('tagOp', 'OR');
 	goto(`/?${params.toString()}`, { keepFocus: true, noScroll: true });
 }
 
@@ -79,6 +83,7 @@ $effect(() => {
 	sort = data.filters?.sort || 'DATE';
 	dir = data.filters?.dir || 'desc';
 	tagQ = data.filters?.tagQ || '';
+	tagOperator = (data.filters?.tagOp as 'AND' | 'OR') || 'AND';
 	if (hasAdvancedFilters(data.filters)) showAdvanced = true;
 });
 
@@ -104,6 +109,7 @@ const showRightColumn = $derived(data.canWrite || (data.incompleteDocs?.length ?
 		bind:sort={sort}
 		bind:dir={dir}
 		bind:tagQ={tagQ}
+		bind:tagOperator={tagOperator}
 		initialSenderName={data.initialValues?.senderName}
 		initialReceiverName={data.initialValues?.receiverName}
 		isLoading={navigating.to !== null}