docs: rename ubiquitous language glossary to CONTEXT and add message state vocabulary

CLAUDE.md

@@ -9,7 +9,7 @@ Rocket.Chat React Native mobile client. Single-package React Native app (not a m
 - React 19.1, React Native 0.81, Expo 54
 - TypeScript with strict mode, baseUrl set to `app/` (imports resolve from there)
 - Node: engines `>=18`, volta pins 24.13.1
-- Read UBIQUITOUS_LANGUAGE.md
+- Read CONTEXT.md
 
 ## Commands
 

UBIQUITOUS_LANGUAGE.md → CONTEXT.md

@@ -52,6 +52,15 @@
 | **Room History**    | Older Messages of a Room fetched on demand from the server (distinct from **Server History**)                                      | Message history        |
 | **Jump to Message** | Re-position the Room view onto a target Message that may be far from the Live Tail or not yet synced — fetches a surrounding Chunk | Scroll to message      |
 
+## Message Interaction & Position State
+
+Two distinct kinds of transient per-Room state drive how the Room view renders Messages. They have different owners and are migrated independently, so keep them apart.
+
+| Term                  | Definition                                                                              | Owner                          | Scope                                                                |
+| --------------------- | --------------------------------------------------------------------------------------- | ------------------------------ | -------------------------------------------------------------------- |
+| **Interaction state** | Which Message is selected and the current Message action — reply, quote, edit, or react | A per-Room interaction store   | Migrated to the per-Room store as part of the Message row work       |
+| **Positional state**  | Which Message is highlighted and the jump or scroll position                            | The Room view scroll machinery | Stays with the Room view scroll machinery and is migrated separately |
+
 ## Users & Roles
 
 | Term            | Definition                                                                         | Aliases to avoid        |

app/lib/services/voip/docs/README.md

@@ -12,4 +12,4 @@ Entry point for documentation of the peer-to-peer audio call subsystem. VoIP is
 
 ## Glossary
 
-Domain terms used throughout these docs are defined in the project glossary at `../../../../UBIQUITOUS_LANGUAGE.md` under "Video & Voice".
+Domain terms used throughout these docs are defined in the project glossary at `../../../../CONTEXT.md` under "Video & Voice".

app/views/RoomView/docs/ARCHITECTURE.md

@@ -1,6 +1,6 @@
 # Room Message Loading Architecture
 
-Load-bearing reference for how the Room view loads, observes, and re-positions Messages. Read this before `FLOWS.md` — that document assumes the vocabulary defined here. Domain terms (Message Window, Live Tail, Anchored Window, Chunk, Gap, Loader Row) are defined in the repo glossary `UBIQUITOUS_LANGUAGE.md` under "Message Loading"; this document uses them as defined there.
+Load-bearing reference for how the Room view loads, observes, and re-positions Messages. Read this before `FLOWS.md` — that document assumes the vocabulary defined here. Domain terms (Message Window, Live Tail, Anchored Window, Chunk, Gap, Loader Row) are defined in the repo glossary `CONTEXT.md` under "Message Loading"; this document uses them as defined there.
 
 ## Overview