feat(library): backlog status, rating, notes and priority in the UI

Detail page gets an edit card. The library gets status badges, status filter
chips and a debounced name search, both kept in the URL.

src/utils/backlog.js

@@ -0,0 +1,21 @@
+export const GAME_STATUSES = ['BACKLOG', 'PLAYING', 'FINISHED', 'COMPLETED', 'DROPPED'];
+export const GAME_PRIORITIES = ['HIGH', 'MEDIUM', 'LOW'];
+
+// Radix Select has no empty value, so "no priority" needs its own value in the form.
+export const NO_PRIORITY = 'NONE';
+
+export const parseStatus = (value) => (GAME_STATUSES.includes(value) ? value : null);
+
+export const toBacklogRequest = ({status, rating, notes, priority}) => ({
+    status,
+    rating: rating || null,
+    notes: notes?.trim() ? notes : null,
+    priority: priority === NO_PRIORITY ? null : priority,
+});
+
+export const libraryQuery = ({page, size, sort, status, q}) => {
+    const params = new URLSearchParams({page: String(page), size: String(size), sort});
+    if (status) params.set('status', status);
+    if (q?.trim()) params.set('q', q.trim());
+    return params.toString();
+};