fix: move breakpoint keys to <leader> prefix to avoid clobbering x/X/D

lua/tiny-debugger/config.lua

@@ -10,14 +10,14 @@ M.defaults = {
     step_into = "d",
     step_out = "r",
     run_to_cursor = "C",
-    breakpoint = "x",
-    cond_breakpoint = "X",
+    breakpoint = "<leader>x",
+    cond_breakpoint = "<leader>X",
     watch = "W",
     hover = "K",
     eval = "E",
     terminate = "q",
     restart = "R",
-    clear_breakpoints = "D",
+    clear_breakpoints = "<leader>D",
     help = "?",
   },