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.

test-semantic-highlights.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+# Test semantic highlights in a real Neovim session
+# This will open test-html.html and check if custom captures are applied
+
+nvim test-html.html -c "normal! 15Gf\"" -c "lua vim.defer_fn(function() vim.cmd('normal! \\<leader>hi'); vim.cmd('quitall!'); end, 500)"