Feat: add filetree plugin

- use neotree as the filetree plugin
- change keymap for float diagnostic messages

init.lua

@@ -339,7 +339,7 @@ vim.keymap.set('n', 'j', "v:count == 0 ? 'gj' : 'j'", { expr = true, silent = tr
 -- Diagnostic keymaps
 vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, { desc = 'Go to previous diagnostic message' })
 vim.keymap.set('n', ']d', vim.diagnostic.goto_next, { desc = 'Go to next diagnostic message' })
-vim.keymap.set('n', '<leader>e', vim.diagnostic.open_float, { desc = 'Open floating diagnostic message' })
+vim.keymap.set('n', '<leader>cd', vim.diagnostic.open_float, { desc = 'Open floating diagnostic message' })
 vim.keymap.set('n', '<leader>q', vim.diagnostic.setloclist, { desc = 'Open diagnostics list' })
 
 -- [[ Highlight on yank ]]

lua/custom/plugins/filetree.lua

@@ -0,0 +1,21 @@
+vim.cmd([[ let g:neo_tree_remove_legacy_commands = 1 ]])
+
+return {
+  "nvim-neo-tree/neo-tree.nvim",
+  version = "*",
+  dependencies = {
+    "nvim-lua/plenary.nvim",
+    "nvim-tree/nvim-web-devicons", -- not strictly required, but recommended
+    "MunifTanjim/nui.nvim",
+  },
+  cmd = "NeoTree",
+  keys = {
+    {
+      "<leader>e",
+      function()
+        require("neo-tree.command").execute({ toggle = true, dir = vim.loop.cwd() })
+      end,
+      desc = "Explorer NeoTree (cwd)"
+    }
+  }
+}