chore: expand root .gitignore with comprehensive patterns

Cover Python, Node, secrets, databases, OS artefacts, and editors.
Previous entry was minimal; this replaces it with a well-structured,
commented ignore file suitable for a full-stack Python/React project.

.gitignore

@@ -1,34 +1,99 @@
-# Python
+# ─────────────────────────────────────────────
+#  BanGUI — root .gitignore
+# ─────────────────────────────────────────────
+
+# ── Python ────────────────────────────────────
 __pycache__/
 *.py[cod]
 *.pyo
+*.pyd
+*.so
+.Python
+
+# Virtualenvs
+.venv/
+venv/
+env/
+ENV/
+.python-version
+
+# Distribution / packaging
+dist/
+build/
+*.egg-info/
+*.egg
+MANIFEST
+
+# Testing & coverage
 .coverage
 .coverage.*
 htmlcov/
 .pytest_cache/
+.tox/
+nosetests.xml
+coverage.xml
+*.cover
+
+# Type checkers & linters
 .mypy_cache/
 .ruff_cache/
-dist/
-build/
-*.egg-info/
-.venv/
-venv/
-env/
+.dmypy.json
+dmypy.json
+pyrightconfig.json
+.pytype/
 
-# Node
+# ── Node / Frontend ───────────────────────────
 node_modules/
-dist/
-.vite/
+.pnp
+.pnp.js
 
-# Env
+# Build output
+frontend/dist/
+frontend/.vite/
+
+# Logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+# ── Secrets / Environment ─────────────────────
 .env
-*.env
+.env.*
+!.env.example
+*.pem
+secrets.json
 
-# OS
+# ── Databases ─────────────────────────────────
+*.sqlite3
+*.db
+*.db-shm
+*.db-wal
+
+# ── OS artefacts ──────────────────────────────
 .DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
 Thumbs.db
 
-# Editor
+# ── Editor / IDE ──────────────────────────────
 .idea/
+*.iml
+*.sublime-project
+*.sublime-workspace
+.vscode/settings.json
+.vscode/launch.json
+.vscode/*.log
 *.swp
 *.swo
+*~
+
+# ── Misc ──────────────────────────────────────
+*.log
+*.tmp
+*.bak
+*.orig