feat(lsp, ui, core): refactor LSP initialization, improve config handling, and clean up TreeSitter

* LSP Client & Manager
  Refactored initialization flow to use internal state instead of passing params
  Added workspace_path and init_opts to LSPClient
  Simplified send_initialize_message() (no external args)
  Updated manager/client APIs to require explicit workspace_path and typed init_opts
  Improved client lifecycle handling and UI button toggling

* LSP Manager UI
  Added {user.home} substitution support in configs
  Use live editor buffer for JSON config parsing instead of static template
  Minor cleanup and formatting improvements

* Core Widgets
  Prevent external modification checks for buffer-only files in SourceFile
  Minor formatting cleanup in SourceView

* Plugins / Manifest
  Expanded manifest schema: added description and copyright, reordered fields

* Cleanup
  Removed TreeSitter compile script and TODO entry
  General code formatting and small consistency fixes

chore: remove unused TreeSitter tooling and related TODO entry

TODO.md

@@ -1,6 +1,5 @@
 ___
 ### Add
-1. Add TreeSitter
 1. Add Collapsable code blocks
 1. Add Godot LSP Client
 1. Add Terminal plugin