docs: Add comprehensive timing and preparation guide

- Add timing-and-preparation.md covering lookahead, preroll, preliminary, and transitions
- Add glossary.md with definitions of all key Sofie concepts
- Document how timing mechanisms work together with adlibs
- Explain device latency compensation strategies
- Add cross-references between related documentation pages

This addresses common questions about when to use each timing mechanism
and how they interact, especially for adlib scenarios where lookahead
cannot predict operator actions.

Author: rjmunro

packages/documentation/docs/for-developers/for-blueprint-developers/ab-playback.md

@@ -4,6 +4,10 @@
 Prior to 1.50 of Sofie, this was implemented in Blueprints and not natively in Sofie-core
 :::
 
+:::tip See Also
+For how AB Playback works with lookahead, preroll, and adlibs, see the [Timing and Preparation Guide](./timing-and-preparation.md).
+:::
+
 _AB Playback_ is a common technique for clip playback. The aim is to be able to play multiple clips back to back, alternating which player is used for each clip.  
 At first glance it sounds simple to handle, but it quickly becomes complicated when we consider the need to allow users to run adlibs and that the system needs to seamlessly update pre-programmed clips when this happens.
 

packages/documentation/docs/for-developers/for-blueprint-developers/lookahead.md

@@ -1,5 +1,9 @@
 # Lookahead
 
+:::tip See Also
+For a comprehensive guide on how lookahead works together with preroll, preliminary, transitions, and adlibs, see the [Timing and Preparation Guide](./timing-and-preparation.md).
+:::
+
 Lookahead allows Sofie to look into future Parts and Pieces, in order to preload or preview what is coming up. The aim is to fill in the gaps between your TimelineObjects with lookahead versions of these objects.  
 In this way, it can be used to provide functionality such as an AUX on your vision mixer showing the next cut, or to load the next clip into the media player.
 

packages/documentation/docs/for-developers/for-blueprint-developers/part-and-piece-timings.mdx

@@ -2,6 +2,10 @@ import { PartTimingsDemo } from './_part-timings-demo'
 
 # Part and Piece Timings
 
+:::tip See Also
+For practical guidance on using preroll, transitions, lookahead together with adlibs, see the [Timing and Preparation Guide](./timing-and-preparation.md).
+:::
+
 Parts and pieces are the core groups that form the timeline, and define start and end caps for the other timeline objects.
 
 When referring to the timeline in this page, we mean the built timeline objects that is sent to playout-gateway.