Add trailing slashes to directory entries in .gitignore and include .idea/ for JetBrains IDEs

- Changed directory entries from `coverage`, `dist`, `node_modules`, `.vscode` to use trailing slashes
- Added `.idea/` to ignore JetBrains IDE configuration files
- Improves clarity by explicitly marking directories with trailing slashes
- Ensures consistent ignore pattern format across all directory entries

Author: scripthunter7

.gitignore

@@ -1,10 +1,11 @@
 *.log
 .DS_Store
 .eslintcache
-.vscode
-coverage
-dist
-node_modules
+.vscode/
+.idea/
+coverage/
+dist/
+node_modules/
 .pnpm-store/
 
 # npmjs token