chore(git): Add common local and editor files to .gitignore

- Added: `.env` to avoid committing local environment variables
- Added: `.vscode/` to ignore editor workspace settings and launch configs
- Added: `trash` to ignore developer temporary files

These entries reduce noisy diffs and help prevent accidental leakage of local secrets or editor-specific files.

.gitignore

@@ -18,3 +18,6 @@ docs/src/packages
 *.cov
 test/*.h5
 test/*.xmf
+.env
+.vscode
+trash