Fix line endings - Force LF everywhere

- Add .gitattributes to enforce LF line endings
- Update Prettier config with endOfLine: lf
- Reformat all files with LF line endings

This fixes CI format:check failures caused by CRLF/LF mismatch
between Windows development and Linux CI environments.

Author: Sam-Bolling

.gitattributes

@@ -0,0 +1,6 @@
+* text=auto eol=lf
+*.png binary
+*.jpg binary
+*.ico binary
+*.woff binary
+*.woff2 binary

.prettierrc.json

@@ -1,4 +1,5 @@
 {
   "semi": true,
-  "singleQuote": true
+  "singleQuote": true,
+  "endOfLine": "lf"
 }