feat(ui): Save page size (#2080)

* Added PageSize to UIPreferences type

* Update serverapi.go

* fixed gofmt check

* fixed gofmt check for real

Co-authored-by: Jarek Kowalski <jaak@jkowalski.net>

internal/serverapi/serverapi.go

@@ -274,5 +274,6 @@ type CLIInfo struct {
 
 // UIPreferences represents JSON object storing UI preferences.
 type UIPreferences struct {
-	Theme string `json:"theme"` // 'dark', 'light' or ''
+	Theme    string `json:"theme"`    // 'dark', 'light' or ''
+	PageSize int    `json:"pageSize"` // A page size; the actual possible values will only be provided by the frontend
 }