Improve the git diff preview from the file viewer

src/main/search-service.ts

@@ -26,10 +26,13 @@ const rgPathPromise: Promise<string | null> = (async () => {
 export interface ContentHit { no: number; ln: string; ix: number }
 export interface ContentGroup { path: string; hits: ContentHit[] }
 
-/** Always-excluded heavy/noise dirs, on top of gitignore + user excludes. */
+/** Always-excluded heavy/noise dirs and files, on top of gitignore + user
+ * excludes. `.DS_Store` is here because `files.followGitignore` defaults to
+ * false, so rg runs with --no-ignore and would otherwise list it in the tree. */
 const BASE_IGNORE = [
   'node_modules', '.git', 'out', 'dist', 'build', '.cache',
   'vendor', 'coverage', '.helder', '.next', '.nuxt', '.turbo', '.idea', '.vscode',
+  '.DS_Store',
 ]
 
 const MAX_FILES = 400