fix: resolve react-is version mismatch and .gitattributes syntax error

[codebytere]

Override react-is to v19.2.4 via pnpm overrides to fix CounterLabel crash:

chunk-ZTL4OTR6.js?v=90b5cbd1:3741 Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: <CounterLabel />. Did you accidentally export a JSX literal instead of a component?

Check the render method of ForwardRef.
at createFiberFromTypeAndProps (chunk-ZTL4OTR6.js?v=90b5cbd1:3741:30)
at createFiberFromElement (chunk-ZTL4OTR6.js?v=90b5cbd1:3754:16)
at reconcileChildFibersImpl (chunk-ZTL4OTR6.js?v=90b5cbd1:5120:248)
at chunk-ZTL4OTR6.js?v=90b5cbd1:5237:35
at reconcileChildren (chunk-ZTL4OTR6.js?v=90b5cbd1:7182:53)
at beginWork (chunk-ZTL4OTR6.js?v=90b5cbd1:8701:104)
at runWithFiberInDEV (chunk-ZTL4OTR6.js?v=90b5cbd1:997:72)
at performUnitOfWork (chunk-ZTL4OTR6.js?v=90b5cbd1:12561:98)
at workLoopSync (chunk-ZTL4OTR6.js?v=90b5cbd1:12424:43)
at renderRootSync (chunk-ZTL4OTR6.js?v=90b5cbd1:12408:13)

react-is@18.3.1 checks for Symbol(react.element) but React 19 uses Symbol(react.transitional.element), causing isElement() to return false in @primer/react's ButtonBase and blow up at runtime.

Also fix .gitattributes syntax error from stray merge conflict marker:

Before

After

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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