fix(search): local index rejects FTS syntax in live search queries (#983)

* fix(search): reject FTS syntax chars in local index live search queries

FTS5 treats `=` and similar characters as query syntax, so tokens like
1=2 produced unrelated prefix hits. Skip FTS for unsafe tokens instead.

* docs: CHANGELOG for local index FTS syntax query fix (PR #983)

* fix(search): reject syntax junk in server search3 and live search race

Share FTS-safe token guard with search3; skip network invoke for ** and
similar queries; show empty dropdown without misleading source badge.

* fix(search): allow censorship stars in queries, reject wildcard-only tokens

Block ** and **** but keep ***Flawless-style title searches working
in local FTS and search3.

src/utils/library/liveSearchLocal.test.ts

@@ -3,6 +3,7 @@ import { onInvoke } from '@/test/mocks/tauri';
 import type { SearchResults } from '../../api/subsonicTypes';
 import { useAuthStore } from '@/store/authStore';
 import {
+  liveSearchQueryRejected,
   liveSearchQueryTooShort,
   mergeLiveSearchResults,
   runLocalLiveSearch,
@@ -92,6 +93,16 @@ describe('runLocalLiveSearch', () => {
   });
 });
 
+describe('liveSearchQueryRejected', () => {
+  it('rejects syntax junk and single-character queries', () => {
+    expect(liveSearchQueryRejected('**')).toBe(true);
+    expect(liveSearchQueryRejected('1=2')).toBe(true);
+    expect(liveSearchQueryRejected('а')).toBe(true);
+    expect(liveSearchQueryRejected('ab')).toBe(false);
+    expect(liveSearchQueryRejected('metallica')).toBe(false);
+  });
+});
+
 describe('liveSearchQueryTooShort', () => {
   it('treats one grapheme as too short', () => {
     expect(liveSearchQueryTooShort('а')).toBe(true);