docs: Include dictionary as in-scope (#917)

## Summary

* Include dictionary as in-scope

## Additional Context

* Discussion in
https://github.com/crosspoint-reader/crosspoint-reader/discussions/878

---

### 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? No

SCOPE.md

@@ -25,6 +25,8 @@ usability over "swiss-army-knife" functionality.
 * **Library Management:** E.g. Simple, intuitive ways to organize and navigate a collection of books.
 * **Local Transfer:** E.g. Simple, "pull" based book loading via a basic web-server or public and widely-used standards.
 * **Language Support:** E.g. Support for multiple languages both in the reader and in the interfaces.
+* **Reference Tools:** E.g. Local dictionary lookup. Providing quick, offline definitions to enhance comprehension 
+  without breaking focus.
 
 ### Out-of-Scope
 
@@ -34,8 +36,8 @@ usability over "swiss-army-knife" functionality.
 * **Active Connectivity:** No RSS readers, News aggregators, or Web browsers. Background Wi-Fi tasks drain the battery
   and complicate the single-core CPU's execution.
 * **Media Playback:** No Audio players or Audio-books.
-* **Complex Reader Features:** No highlighting, notes, or dictionary lookup. These features are better suited for
-  devices with better input capabilities and more powerful chips.
+* **Complex Annotation:** No typed out notes. These features are better suited for devices with better input
+  capabilities and more powerful chips.
 
 ## 3. Idea Evaluation