chore(git): normalize line endings via .gitattributes

.gitattributes

@@ -0,0 +1,32 @@
+# Normalize line endings and mark binary files
+
+# Default: let Git manage line endings
+* text=auto
+
+# Source files use LF in repo
+*.js   text eol=lf
+*.jsx  text eol=lf
+*.ts   text eol=lf
+*.tsx  text eol=lf
+*.json text eol=lf
+*.css  text eol=lf
+*.scss text eol=lf
+*.md   text eol=lf
+*.yml  text eol=lf
+*.yaml text eol=lf
+*.svg  text eol=lf
+*.sh   text eol=lf
+
+# Windows scripts keep CRLF
+*.ps1  text eol=crlf
+*.bat  text eol=crlf
+*.cmd  text eol=crlf
+
+# Images and binaries
+*.png  binary
+*.jpg  binary
+*.jpeg binary
+*.gif  binary
+*.webp binary
+*.ico  binary
+*.pdf  binary