Make more sliders discrete and ensure they don't look out of place (#1840)

Also cleanup the underlying code

CHANGELOG.md

@@ -13,7 +13,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 ## [Unreleased]
 ### Added
 - Add option to always decode long strip images with SSIV
-  - Change option label ([@AntsyLich](https://github.com/AntsyLich)) ([#1835](https://github.com/mihonapp/mihon/pull/1835))   
+  - Change option label ([@AntsyLich](https://github.com/AntsyLich)) ([#1835](https://github.com/mihonapp/mihon/pull/1835))
 - Added option to enable incognito per extension ([@sdaqo](https://github.com/sdaqo), [@AntsyLich](https://github.com/AntsyLich)) ([#157](https://github.com/mihonapp/mihon/pull/157))
 - Add button to favorite manga from history screen ([@Animeboynz](https://github.com/Animeboynz)) ([#1733](https://github.com/mihonapp/mihon/pull/1733))
 - Add Monochrome theme (made with e-ink displays in mind) ([@MajorTanya](https://github.com/MajorTanya)) ([#1752](https://github.com/mihonapp/mihon/pull/1752))
@@ -25,6 +25,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 - Display staff information on Anilist tracker search results ([@NarwhalHorns](https://github.com/NarwhalHorns)) ([#1810](https://github.com/mihonapp/mihon/pull/1810))
 
 ### Changed
+- Sliders UI
 - Apply "Downloaded only" filter to all entries regardless of favourite status ([@NGB-Was-Taken](https://github.com/NGB-Was-Taken)) ([#1603](https://github.com/mihonapp/mihon/pull/1603))
 - Ignore hidden files/folders for Local Source chapter list ([@BrutuZ](https://github.com/BrutuZ)) ([#1763](https://github.com/mihonapp/mihon/pull/1763))
 - Migrate to newer Bangumi API ([@MajorTanya](https://github.com/MajorTanya)) ([#1748](https://github.com/mihonapp/mihon/pull/1748))