fix(frontend): load full tag/category lists in pickers, honoring sort

The tag pickers, filter bar and batch editor loaded only /tags?limit=200 and
filtered client-side, so with more than 200 tags the rest were invisible and
unsearchable. Same for the category dropdowns on the tag forms.

Add fetchAllTags / fetchAllCategories helpers that page past the server's
per-request cap of 200, and order results by the sort the user chose on the
tags / categories page (tagSorting / categorySorting) instead of a hardcoded
name-asc. Wire them into FilterBar, TagPicker, TagRuleEditor, BulkTagEditor and
the tag new/edit category dropdowns.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/routes/tags/[id]/+page.svelte

@@ -2,7 +2,8 @@
 	import { goto } from '$app/navigation';
 	import { page } from '$app/state';
 	import { api, ApiError } from '$lib/api/client';
-	import type { Category, CategoryOffsetPage, Tag, TagRule } from '$lib/api/types';
+	import type { Category, Tag, TagRule } from '$lib/api/types';
+	import { fetchAllCategories } from '$lib/api/categories';
 	import TagRuleEditor from '$lib/components/tag/TagRuleEditor.svelte';
 	import ConfirmDialog from '$lib/components/common/ConfirmDialog.svelte';
 
@@ -32,12 +33,12 @@
 		loadError = '';
 		void Promise.all([
 			api.get<Tag>(`/tags/${id}`),
-			api.get<CategoryOffsetPage>('/categories?limit=200&sort=name&order=asc'),
+			fetchAllCategories(),
 			api.get<TagRule[]>(`/tags/${id}/rules`).catch(() => [] as TagRule[])
 		])
 			.then(([t, cats, r]) => {
 				tag = t;
-				categories = cats.items ?? [];
+				categories = cats;
 				rules = r;
 
 				name = t.name ?? '';

frontend/src/routes/tags/new/+page.svelte

@@ -1,7 +1,8 @@
 <script lang="ts">
 	import { goto } from '$app/navigation';
 	import { api, ApiError } from '$lib/api/client';
-	import type { Category, CategoryOffsetPage } from '$lib/api/types';
+	import type { Category } from '$lib/api/types';
+	import { fetchAllCategories } from '$lib/api/categories';
 
 	let name = $state('');
 	let notes = $state('');
@@ -13,8 +14,8 @@
 	let categories = $state<Category[]>([]);
 
 	$effect(() => {
-		api.get<CategoryOffsetPage>('/categories?limit=200&sort=name&order=asc').then((p) => {
-			categories = p.items ?? [];
+		fetchAllCategories().then((all) => {
+			categories = all;
 		});
 	});