diff --git a/lazy-lock.json b/lazy-lock.json
index 3edcf8b..7227e46 100644
--- a/lazy-lock.json
+++ b/lazy-lock.json
@@ -5,18 +5,19 @@
   "cmp_luasnip": { "branch": "master", "commit": "98d9cb5c2c38532bd9bdb481067b20fea8f32e90" },
   "conform.nvim": { "branch": "master", "commit": "c2526f1cde528a66e086ab1668e996d162c75f4f" },
   "friendly-snippets": { "branch": "main", "commit": "6cd7280adead7f586db6fccbd15d2cac7e2188b9" },
-  "gitsigns.nvim": { "branch": "main", "commit": "abf82a65f185bd54adc0679f74b7d6e1ada690c9" },
+  "gitsigns.nvim": { "branch": "main", "commit": "31217271a7314c343606acb4072a94a039a19fb5" },
   "indent-blankline.nvim": { "branch": "master", "commit": "005b56001b2cb30bfa61b7986bc50657816ba4ba" },
   "lazy.nvim": { "branch": "main", "commit": "306a05526ada86a7b30af95c5cc81ffba93fef97" },
   "lualine.nvim": { "branch": "master", "commit": "47f91c416daef12db467145e16bed5bbfe00add8" },
-  "mason-lspconfig.nvim": { "branch": "main", "commit": "fb179adb7161b53ec998b1139002473434586c3f" },
+  "mason-lspconfig.nvim": { "branch": "main", "commit": "ae609525ddf01c153c39305730b1791800ffe4fe" },
   "mason.nvim": { "branch": "main", "commit": "44d1e90e1f66e077268191e3ee9d2ac97cc18e65" },
   "nvim": { "branch": "main", "commit": "beaf41a30c26fd7d6c386d383155cbd65dd554cd" },
-  "nvim-autopairs": { "branch": "master", "commit": "c2a0dd0d931d0fb07665e1fedb1ea688da3b80b4" },
+  "nvim-autopairs": { "branch": "master", "commit": "59bce2eef357189c3305e25bc6dd2d138c1683f5" },
   "nvim-cmp": { "branch": "main", "commit": "da88697d7f45d16852c6b2769dc52387d1ddc45f" },
-  "nvim-lspconfig": { "branch": "master", "commit": "ff9c0af8f9b2097fdd2695058db7e04c193908aa" },
-  "nvim-treesitter": { "branch": "main", "commit": "f8bbc3177d929dc86e272c41cc15219f0a7aa1ac" },
-  "nvim-web-devicons": { "branch": "master", "commit": "803353450c374192393f5387b6a0176d0972b848" },
+  "nvim-lspconfig": { "branch": "master", "commit": "d1597791f8196519439b3a036b59b09023981e1d" },
+  "nvim-tree.lua": { "branch": "master", "commit": "a0db8bf7d6488b1dcd9cb5b0dfd6684a1e14f769" },
+  "nvim-treesitter": { "branch": "main", "commit": "9f2dad22ef8bb14fd1e0a3aa8859cdc88170668b" },
+  "nvim-web-devicons": { "branch": "master", "commit": "746ffbb17975ebd6c40142362eee1b0249969c5c" },
   "plenary.nvim": { "branch": "master", "commit": "b9fd5226c2f76c951fc8ed5923d85e4de065e509" },
   "telescope.nvim": { "branch": "master", "commit": "ad7d9580338354ccc136e5b8f0aa4f880434dcdc" },
   "which-key.nvim": { "branch": "main", "commit": "3aab2147e74890957785941f0c1ad87d0a44c15a" }
diff --git a/lua/plugins/coding.lua b/lua/plugins/coding.lua
index 252cf68..5c5538f 100644
--- a/lua/plugins/coding.lua
+++ b/lua/plugins/coding.lua
@@ -11,7 +11,6 @@ return {
         ensure_installed = {
           "go",
           "gomod",
-          "gosum",
           "gowork",
           "typescript",
           "tsx",
@@ -22,6 +21,7 @@ return {
           "markdown",
           "yaml",
           "bash",
+          "c_sharp",
         },
       })
     end,
diff --git a/lua/plugins/lsp.lua b/lua/plugins/lsp.lua
index 97d47cb..c8c7ac5 100644
--- a/lua/plugins/lsp.lua
+++ b/lua/plugins/lsp.lua
@@ -10,7 +10,7 @@ return {
     dependencies = { "williamboman/mason.nvim" },
     opts = {
       -- installs these via Mason (so you don't have to)
-      ensure_installed = { "gopls", "ts_ls", "lua_ls", "clangd", "rust_analyzer" },
+      ensure_installed = { "gopls", "ts_ls", "lua_ls", "clangd", "rust_analyzer", "omnisharp" },
 
       -- optional: automatically call vim.lsp.enable() for installed servers
       automatic_enable = true,
@@ -162,6 +162,7 @@ return {
           c = { "clang-format" },
           cpp = { "clang-format" },
           rust = { "rustfmt" },
+          cs = { "csharpier" },
         },
       })
 
@@ -170,4 +171,5 @@ return {
       end, { desc = "Format" })
     end,
   },
+
 }
diff --git a/lua/plugins/nvim-tree.lua b/lua/plugins/nvim-tree.lua
new file mode 100644
index 0000000..79fa52f
--- /dev/null
+++ b/lua/plugins/nvim-tree.lua
@@ -0,0 +1,43 @@
+-- ~/.config/nvim/lua/plugins/nvim-tree.lua
+return {
+  {
+    "nvim-tree/nvim-tree.lua",
+    version = "*", -- use latest stable tag
+    dependencies = {
+      -- optional, but recommended for file icons
+      "nvim-tree/nvim-web-devicons",
+    },
+    cmd = { "NvimTreeToggle", "NvimTreeFocus", "NvimTreeFindFile", "NvimTreeOpen" },
+    keys = {
+      { "<leader>e", "<cmd>NvimTreeToggle<cr>",   desc = "Explorer (toggle)" },
+      { "<leader>E", "<cmd>NvimTreeFindFile<cr>", desc = "Explorer (reveal file)" },
+    },
+    init = function()
+      -- recommended: disable netrw to avoid conflicts
+      vim.g.loaded_netrw = 1
+      vim.g.loaded_netrwPlugin = 1
+
+      -- you already set this elsewhere, but it's fine to keep it here too
+      vim.opt.termguicolors = true
+    end,
+    opts = {
+      sort = { sorter = "case_sensitive" },
+      view = { width = 32 },
+      renderer = { group_empty = true },
+      filters = { dotfiles = false },
+
+      -- Quality-of-life
+      update_focused_file = {
+        enable = true,
+        update_root = false,
+      },
+      git = { enable = true },
+      diagnostics = { enable = true },
+
+      -- Close tree when opening a file (optional: set to false if you prefer it pinned)
+      actions = {
+        open_file = { quit_on_open = false },
+      },
+    },
+  },
+}
diff --git a/lua/plugins/ui.lua b/lua/plugins/ui.lua
index b1b1cd6..a69b0f2 100644
--- a/lua/plugins/ui.lua
+++ b/lua/plugins/ui.lua
@@ -1,7 +1,6 @@
 return {
   { "nvim-tree/nvim-web-devicons", lazy = true },
 
-  -- Theme: pick ONE. TokyoNight is a safe default.
   {
     "catppuccin/nvim",
     priority = 1000,
@@ -28,5 +27,5 @@ return {
         options = { theme = "auto", globalstatus = true },
       })
     end,
-  },
+  }
 }