Include the entire document in autocompletion in the Compiler IDE

The Compiler IDE offers autocompletion across sections, allowing quick entry of key and parameter names, support functions, and classes. However, autocompletion does not include other words found in the document. For example, the name of the main executable will never be suggested, even though it is present in the script.

Add word-based autocompletion, similar to editors like Visual Studio Code. This should work across files.