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.

CHANGELOG.md

@@ -524,6 +524,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Excluding all genres collapses to a single untagged-genre rule instead of hundreds of `notContains` filters that stalled Navidrome; empty smart playlists settle without a false "Playlist not found" after a long spinner.
 
 
+### Local index live search — no junk hits on `=` and syntax characters
+
+**By [@cucadmuh](https://github.com/cucadmuh), reported by zunoz on the Psysonic Discord, PR [#983](https://github.com/Psychotoxical/psysonic/pull/983)**
+
+* Queries such as `1=2` or `M=c` no longer return unrelated albums and artists — FTS5 was parsing `=` and similar characters as query syntax instead of a literal token.
+* Wildcard-only queries (`**`, `****`) are rejected for both local index and server search; titles that contain censorship stars (e.g. `***Flawless`) remain searchable.
+
+
 ### In-page browse — virtual scroll and cover-art priority
 
 **By [@cucadmuh](https://github.com/cucadmuh), PR [#783](https://github.com/Psychotoxical/psysonic/pull/783)**