fix: prevent to render react components on preact

[fkatsuhiro]

Changes

issue : #15341

Neither React nor Preact components were clearly identified during the check phase. As a result, both were allowed to proceed to the rendering stage, and framework identification only occurred after an error was triggered.

components name: Counter
Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
1. You might have mismatching versions of React and the renderer (such as React DOM)
2. You might be breaking the Rules of Hooks
3. You might have more than one copy of React in the same app
See https://react.dev/link/invalid-hook-call for tips about how to debug and fix this problem.
components name: PreactCounter

I discovered a definitive structural difference in the transpiled output (via Component.toString()):
Preact: Uses a variable named _jsxFileName for source mapping.
React: Uses a raw string literal containing the absolute/relative file path.

ex)
Preact : fileName: _jsxFileName,
React : fileName: "/Users/katsu/personel_dev/astro-v6-react-19-hook-issue/src/components/react/ReactCounter.tsx",

Testing

2026-02-14.3.19.59.mov

Docs

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