feat: move all debug keys under <leader>d prefix with which-key support

lua/tiny-debugger/init.lua

@@ -3,10 +3,23 @@ local mode = require("tiny-debugger.mode")
 
 local M = {}
 
+local setup_done = false
+
 function M.setup(opts)
+  if setup_done then return end
+  setup_done = true
+
   config.merge(opts)
   require("tiny-debugger.breakpoints").setup()
   require("tiny-debugger.adapters").setup()
+
+  -- global toggle keybinding
+  local toggle_key = config.opts.global_keys.toggle
+  if toggle_key then
+    vim.keymap.set("n", toggle_key, function() mode.toggle() end, {
+      silent = true, desc = "Toggle debug mode",
+    })
+  end
 end
 
 function M.toggle()