feat: add custom sleep timer picker (#2206)

## Summary

* **What is the goal of this PR?**
Mainly fixes #2196, but also allows users to set a sleep time of 1~30
min or to never sleep.

* **What changes are included?**

1. Revert changes from #1948 and #2137 (Sorry @Uri-Tauber)
2. Cherrypick changes from
https://github.com/uxjulia/CrossInk/commit/0cb91c3dd1c63f0559d4392fadc4a8340af5bdde
and
https://github.com/uxjulia/CrossInk/commit/4e6bd634b6ede51ff1a7107ba3e8efcd152bc6ee
for a timeout interval picker UI, the custom sleep time feature, and
migrate the existing setting in v1.3.0, `sleepTimeout`, to
`sleepTimeoutMinutes` (Thanks! @uxjulia)
3. Add a "Never" at the far right of the timeout interval picker

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**PARTIALLY**_

---------

Co-authored-by: Julia <julia@uxj.io>

lib/I18n/translations/dutch.yaml

@@ -153,7 +153,6 @@ STR_ALIGN_LEFT: "Links"
 STR_CENTER: "Centreren"
 STR_ALIGN_RIGHT: "Rechts"
 STR_MIN_1: "1 min"
-STR_MIN_3: "3 min"
 STR_MIN_5: "5 min"
 STR_MIN_10: "10 min"
 STR_MIN_15: "15 min"
@@ -298,6 +297,9 @@ STR_OPDS_SERVER_URL: "OPDS-server URL"
 STR_FOOTNOTES: "Voetnoten"
 STR_NO_FOOTNOTES: "Geen voetnoten op deze pagina"
 STR_LINK: "[link]"
+STR_SLEEP_TIMER_VALUE_FORMAT: "%u min"
+STR_SLEEP_NEVER: "Nooit"
+STR_SLEEP_TIMER_STEP_HINT: "Links/Rechts: 1 min  Omhoog/Omlaag: 5 min"
 STR_SCREENSHOT_BUTTON: "Screenshot maken"
 STR_AUTO_TURN_ENABLED: "Automatisch omslaan ingeschakeld: "
 STR_AUTO_TURN_PAGES_PER_MIN: "Autom. omslaan (pagina's per minuut)"