fix: use deep comparison for launch params to prevent spurious warning

[behnam-oneschema]

Summary

Fixes #137. The OneSchemaImporter React component logs a spurious "already launched" warning on every re-render after the importer has launched, even when no launch params have actually changed.

Root cause: params is created via ...rest destructuring in the function signature, producing a new object reference on every render. The useEffect dependency array used this unstable reference, so the effect (and the warning) fired on every render cycle.

Fix: Replace referential equality with JSON.stringify-based deep comparison. A useRef tracks the previous serialized params, and the warning only fires when param values have genuinely changed. The dependency array uses JSON.stringify(params) so the effect itself is also skipped when values are stable.

Review & Testing Checklist for Human

• Verify that JSON.stringify is adequate for all OneSchemaLaunchParamOptions fields — confirm none contain functions, undefined values that matter, or circular references that would break serialization
• Confirm the first-render guard (prevParamsRef.current !== undefined) correctly suppresses the warning on initial mount (we don't want a warning before params have ever "changed")
• Manual test: Render <OneSchemaImporter> with isOpen={true}, trigger a parent re-render (e.g. unrelated state change), and confirm the console warning no longer appears. Then actually change a launch param (e.g. userJwt) and confirm the warning does appear.

Notes

• No new dependencies added; JSON.stringify is used instead of a third-party deep-compare library.
• The eslint-disable-next-line react-hooks/exhaustive-deps is intentional: the dep array uses a computed JSON.stringify(params) expression rather than the raw params object, which the lint rule doesn't understand.

Link to Devin session: https://app.devin.ai/sessions/d9dbde3b76454bd6aa82a610c90d6776
Requested by: @behnam-oneschema

[devin-ai-integration]

Original prompt from Behnam 🧑‍💻

propose a fix for #137

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