feat: add TypeScript/JavaScript LSP and formatting support

Add ts_ls and eslint language servers for TypeScript/JavaScript development.
Configure prettier formatter for JS, CSS, and HTML files.

config/plugins/lsp/conform.nix

@@ -25,6 +25,15 @@
         rust = [
           "rustfmt"
         ];
+        javascript = [
+          "prettier"
+        ];
+        css = [
+          "prettier"
+        ];
+        html = [
+          "prettier"
+        ];
       };
 
       # Install our formatters
@@ -51,6 +60,9 @@
         rustfmt = {
           command = lib.getExe pkgs.rustfmt;
         };
+        prettier = {
+          command = lib.getExe pkgs.prettierd;
+        };
       };
 
       # Receive notificaton when a formatter errors.

config/plugins/lsp/lsp.nix

@@ -41,6 +41,13 @@
         installCargo = true;
         installRustc = true;
       };
+      # TypeScript/JavaScript
+      ts_ls = {
+        enable = true;
+      };
+      eslint = {
+        enable = true;
+      };
     };
 
     keymaps = {