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/keymaps.lua

@@ -46,3 +46,138 @@ end, { desc = 'Show all errors in quickfix', silent = true })
 map('n', '[d', vim.diagnostic.goto_prev, { desc = 'Go to previous diagnostic', silent = true })
 map('n', ']d', vim.diagnostic.goto_next, { desc = 'Go to next diagnostic', silent = true })
 map('n', '<leader>xd', vim.diagnostic.open_float, { desc = 'Show diagnostic under cursor', silent = true })
+
+-- Debug: Show highlight group and color under cursor
+map('n', '<leader>hi', function()
+  local cursor_pos = vim.api.nvim_win_get_cursor(0)
+  local row, col = cursor_pos[1] - 1, cursor_pos[2]
+  
+  -- Get all highlight groups at cursor position
+  local ts_hl = vim.treesitter.get_captures_at_pos(0, row, col)
+  local synID = vim.fn.synID(row + 1, col + 1, 1)
+  local synName = vim.fn.synIDattr(synID, 'name')
+  local synTrans = vim.fn.synIDattr(vim.fn.synIDtrans(synID), 'name')
+  
+  -- Helper to resolve highlight links
+  local function resolve_hl(name)
+    local hl = vim.api.nvim_get_hl(0, { name = name })
+    local max_depth = 10
+    local depth = 0
+    while hl.link and depth < max_depth do
+      name = hl.link
+      hl = vim.api.nvim_get_hl(0, { name = name })
+      depth = depth + 1
+    end
+    return hl, name
+  end
+  
+  local lines = {
+    '=== Highlight Info Under Cursor ===',
+    '',
+    'Position: row=' .. row .. ' col=' .. col,
+    '',
+  }
+  
+  -- TreeSitter captures
+  if #ts_hl > 0 then
+    table.insert(lines, 'TreeSitter Captures:')
+    for _, capture in ipairs(ts_hl) do
+      local cap_name = '@' .. capture.capture
+      local hl, resolved_name = resolve_hl(cap_name)
+      
+      table.insert(lines, string.format('  %s', cap_name))
+      if resolved_name ~= cap_name then
+        table.insert(lines, string.format('    → resolves to: %s', resolved_name))
+      end
+      if hl.fg then
+        table.insert(lines, string.format('    fg: #%06x', hl.fg))
+      end
+      if hl.bg then
+        table.insert(lines, string.format('    bg: #%06x', hl.bg))
+      end
+      
+      local styles = {}
+      if hl.bold then table.insert(styles, 'bold') end
+      if hl.italic then table.insert(styles, 'italic') end
+      if hl.underline then table.insert(styles, 'underline') end
+      if #styles > 0 then
+        table.insert(lines, '    style: ' .. table.concat(styles, ', '))
+      end
+    end
+    table.insert(lines, '')
+  end
+  
+  -- Syntax group
+  if synName ~= '' then
+    table.insert(lines, 'Syntax Group: ' .. synName)
+    if synTrans ~= synName and synTrans ~= '' then
+      table.insert(lines, 'Translates to: ' .. synTrans)
+    end
+    
+    local hl, resolved_name = resolve_hl(synTrans ~= '' and synTrans or synName)
+    if hl.fg then
+      table.insert(lines, string.format('  fg: #%06x', hl.fg))
+    end
+    if hl.bg then
+      table.insert(lines, string.format('  bg: #%06x', hl.bg))
+    end
+    table.insert(lines, '')
+  end
+  
+  -- Final applied highlight (use TreeSitter if available, otherwise syntax)
+  local final_hl_name = nil
+  if #ts_hl > 0 then
+    final_hl_name = '@' .. ts_hl[1].capture
+  elseif synTrans ~= '' then
+    final_hl_name = synTrans
+  elseif synName ~= '' then
+    final_hl_name = synName
+  end
+  
+  if final_hl_name then
+    local final_hl, final_resolved = resolve_hl(final_hl_name)
+    table.insert(lines, 'Applied Highlight: ' .. final_resolved)
+    if final_hl.fg then
+      table.insert(lines, string.format('  fg: #%06x', final_hl.fg))
+    else
+      table.insert(lines, '  fg: NONE')
+    end
+    if final_hl.bg then
+      table.insert(lines, string.format('  bg: #%06x', final_hl.bg))
+    else
+      table.insert(lines, '  bg: NONE')
+    end
+    
+    local styles = {}
+    if final_hl.bold then table.insert(styles, 'bold') end
+    if final_hl.italic then table.insert(styles, 'italic') end
+    if final_hl.underline then table.insert(styles, 'underline') end
+    if final_hl.undercurl then table.insert(styles, 'undercurl') end
+    if #styles > 0 then
+      table.insert(lines, '  style: ' .. table.concat(styles, ', '))
+    end
+  end
+  
+  -- Show in a floating window
+  local buf = vim.api.nvim_create_buf(false, true)
+  vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
+  
+  local width = 0
+  for _, line in ipairs(lines) do
+    width = math.max(width, #line)
+  end
+  width = math.min(width + 2, vim.o.columns - 4)
+  
+  local height = #lines
+  local opts = {
+    relative = 'cursor',
+    width = width,
+    height = height,
+    row = 1,
+    col = 0,
+    style = 'minimal',
+    border = 'rounded',
+  }
+  
+  vim.api.nvim_open_win(buf, false, opts)
+end, { desc = 'Show highlight group and color under cursor', silent = true })