Improve diagnostic looks

modules/home-manager/nixvim/keymaps.nix

@@ -7,6 +7,13 @@
       options.silent = true;
     }
 
+    {
+      mode = "n";
+      key = "<leader>q";
+      action.__raw = "vim.diagnostic.setloclist";
+      options.desc = "Open diagnostics quickfix list";
+    }
+
     {
       mode = "n";
       key = "<C-h>";

modules/home-manager/nixvim/plugins/lsp.nix

@@ -1,5 +1,28 @@
 {
   programs.nixvim = {
+    diagnostic.settings = {
+      severity_sort = true;
+      float = {
+        border = "rounded";
+        source = "if_many";
+      };
+      signs.text.__raw = "{
+        [vim.diagnostic.severity.ERROR] = '󰅚 ',
+        [vim.diagnostic.severity.WARN] = '󰀪 ',
+        [vim.diagnostic.severity.INFO] = '󰋽 ',
+        [vim.diagnostic.severity.HINT] = '󰌶 ',
+      }";
+      virtual_text = {
+        source = "if_many";
+        spacing = 2;
+        format.__raw = "
+          function(diagnostic)
+            return diagnostic.message
+          end
+        ";
+      };
+    };
+
     plugins = {
       lsp = {
         enable = true;