chore: ignore transpiled .js files in apps/web/src to prevent shadowing

Vite resolves .js before .tsx when both exist, causing stale compiled
JS output to shadow TSX source files. Add .gitignore exceptions for
legitimate standalone JS files.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.gitignore

@@ -7,3 +7,10 @@ dist/
 *.log
 .turbo/
 coverage/
+
+# Vite resolves .js before .tsx — don't accidentally commit transpiled output
+apps/web/src/**/*.js
+!apps/web/src/lib/*.js
+!apps/web/src/portal/mockData.js
+!apps/web/src/portal/sections/PetForm.js
+!apps/web/src/test/setup.js