chore: tighten .gitignore (makepkg/flatpak/build artifacts)

.gitignore

@@ -1 +1,33 @@
+/# --- OS cruft ---
+.DS_Store
+Thumbs.db
+
+# --- Go build outputs ---
+/relibre-app
+*.exe
+*.exe~
+*.out
+
+# --- Local run bundle ---
+/dist-run/
+
+# --- makepkg artifacts ---
+/pkg/
 /src/
+/*.pkg.tar.*
+/*.src.tar.*
+
+# --- Flatpak / flatpak-builder ---
+/.flatpak-builder/
+/build-dir/
+
+# --- Release artifacts ---
+/binaries/*.tar.gz
+/binaries/*.tar.xz
+/binaries/*.sha256
+/binaries/*.asc
+
+# --- Node / misc (future-proof if you add tooling) ---
+/node_modules/
+npm-debug.log*
+yarn-error.log*