Build symbol table for @-resolution and $-tracking

[DaanV2]

Overview

This issue tracks implementing diagnostics, project provider, and language server support for resource pack UI definitions in Minecraft Bedrock.

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Motivation

• The language server currently does NOT validate, lint, or offer diagnostics for any files in resource_pack/ui/*, even though these power most custom screens and modded menus.
• Users are flying blind for JSON errors, misspelled UI types, broken @ inheritance, missing bindings, or misplaced variables.

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Definition of Done

• UI files are processed by the diagnostics project and symbol table for @-resolution and $-tracking are tracked in the database

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Links

• Reference UI files: Mojang/bedrock-samples/resource_pack/ui
• Schema tracking: [Blockception/Minecraft-bedrock-json-schemas#ui-tracking] (link TBD)