fix(settings): name descending size sort explicitly

The library sort setting used `size` for largest-first sorting while the
ascending option used `sizeAsc`. That made the pair asymmetric and left the
current settings model carrying a legacy-looking key.

Rename the current descending key to `sizeDesc` in the type, menu, and sort
logic. Stored `size` values are normalized to `sizeDesc` on read, so existing
users keep the same largest-first behavior while new writes use the explicit
key.

Test Plan:
- deno task build
- RUSTC_WRAPPER= CARGO_BUILD_RUSTC_WRAPPER= just build
- git diff --check

Refs: local review feedback

crates/lanspread-tauri-deno-ts/src/hooks/useSettings.ts

@@ -17,6 +17,9 @@ export interface UISettings {
     filter: GameFilter;
 }
 
+type StoredGameSort = GameSort | 'size';
+type StoredUISettings = Partial<Omit<UISettings, 'sort'> & { sort: StoredGameSort }>;
+
 export const ACCENT_OPTIONS = [
     { value: '#3b82f6', label: 'Blue' },
     { value: '#22d3ee', label: 'Cyan' },
@@ -53,15 +56,19 @@ export const DEFAULT_SETTINGS: UISettings = {
     filter: 'local',
 };
 
-const sanitize = (raw: Partial<UISettings> | undefined): UISettings => ({
+const sanitize = (raw: StoredUISettings | undefined): UISettings => ({
     accent: raw?.accent ?? DEFAULT_SETTINGS.accent,
     bg: raw?.bg ?? DEFAULT_SETTINGS.bg,
     density: raw?.density ?? DEFAULT_SETTINGS.density,
     aspect: raw?.aspect ?? DEFAULT_SETTINGS.aspect,
-    sort: raw?.sort ?? DEFAULT_SETTINGS.sort,
+    sort: sanitizeSort(raw?.sort),
     filter: raw?.filter ?? DEFAULT_SETTINGS.filter,
 });
 
+const sanitizeSort = (sort: StoredGameSort | undefined): GameSort => (
+    sort === 'size' ? 'sizeDesc' : sort ?? DEFAULT_SETTINGS.sort
+);
+
 export interface UseSettings {
     settings: UISettings;
     set: <K extends keyof UISettings>(key: K, value: UISettings[K]) => void;
@@ -82,7 +89,7 @@ export const useSettings = (): UseSettings => {
         const init = async () => {
             try {
                 const store = await load(SETTINGS_FILE, SETTINGS_FILE_OPTIONS);
-                const saved = await store.get<Partial<UISettings>>(UI_SETTINGS_KEY);
+                const saved = await store.get<StoredUISettings>(UI_SETTINGS_KEY);
                 if (!cancelled) {
                     setSettings(sanitize(saved ?? undefined));
                 }