Refactor Paper Tonic Modern colorscheme and enhance semantic highlighting

- Updated highlights.scm to improve CSS, HTML, and data attribute captures with higher priority.
- Added a new Lua function to display highlight group and color information under the cursor.
- Expanded editor, semantic, syntax, and TreeSitter highlight groups for better visual consistency across languages.
- Created test files for PHP, HTML, CSS, and Lua to validate syntax highlighting.
- Implemented a shell script to test semantic highlights in a Neovim session.
- Simplified colorscheme loading process by removing unnecessary plugin specifications.

lua/plugins/colorscheme.lua

@@ -1,13 +1,10 @@
--- Paper Tonic colorscheme
--- Local plugin via symlink
+-- Paper Tonic Modern colorscheme
+-- Built into this config at colors/paper-tonic-modern.lua
+-- No plugin spec needed - just set the colorscheme
+
+-- Set colorscheme directly without lazy.nvim
+vim.cmd.colorscheme('paper-tonic-modern')
+
+-- Return empty table so lazy.nvim doesn't complain
+return {}
 
-return {
-  {
-    dir = vim.fn.expand('~/.config/nvim/paper-tonic'),
-    lazy = false,    -- Load immediately on startup
-    priority = 1000, -- Load before other plugins
-    config = function()
-      vim.cmd.colorscheme('paper-tonic')
-    end,
-  },
-}