Refactor config: fix conflicts, add features, update docs

- Fix keymap conflicts: session (<leader>sS/sR), substitute (<leader>sl)
- Remove duplicate keymaps (window, resize) and options (synmaxcol, foldmethod)
- Add which-key group names for better keymap organization
- Add auto-format on save with smart filtering (conform.nvim)
- Add diagnostic float on hover (CursorHold)
- Add safe buffer close with unsaved changes confirmation
- Add quickfix/location list navigation keymaps
- Add startup config validation (nvim version, executables)
- Enable plugin update notifications in lazy.nvim
- Clean up: remove temporary files (kkk, cleanup script)
- Clean up: remove commented code and fix double function loading
- Update README.md with comprehensive documentation
- Add CHANGELOG.md tracking all changes

lua/cargdev/plugins/formatting.lua

@@ -32,7 +32,22 @@ return {
         dbml = { "dbml" }, -- DBML formatting
         sql = { "sqlfluff" }, -- SQL formatting
       },
-      format_on_save = false, -- Set to true if you want auto-formatting on save
+      format_on_save = function(bufnr)
+        -- Disable autoformat for certain filetypes
+        local ignore_filetypes = { "sql", "markdown" }
+        if vim.tbl_contains(ignore_filetypes, vim.bo[bufnr].filetype) then
+          return
+        end
+        -- Disable for files in certain paths
+        local bufname = vim.api.nvim_buf_get_name(bufnr)
+        if bufname:match("/node_modules/") then
+          return
+        end
+        return {
+          timeout_ms = 2000,
+          lsp_fallback = true,
+        }
+      end,
     })
 
     vim.keymap.set({ "n", "v" }, "<leader>mm", function()
@@ -41,6 +56,16 @@ return {
         async = false,
         timeout_ms = 2000,
       })
-    end, { desc = "Format file or range (in visual mode)" })
+    end, { desc = "Format: File or range (in visual mode)" })
+
+    -- Toggle auto-format on save
+    vim.api.nvim_create_user_command("FormatToggle", function()
+      vim.g.disable_autoformat = not vim.g.disable_autoformat
+      if vim.g.disable_autoformat then
+        vim.notify("Auto-format on save disabled", vim.log.levels.INFO)
+      else
+        vim.notify("Auto-format on save enabled", vim.log.levels.INFO)
+      end
+    end, { desc = "Toggle auto-format on save" })
   end,
 }