PRXT - fix: add primary error callback to fallback image

[punk6529]

Summary

• replace the FallbackImage console.log with a new optional onPrimaryError callback so consumers can react when the primary source fails without emitting console output
• ensure the component keeps working by resetting state on source changes and guard the fallback branch via the callback
• add a Jest test that confirms the component swaps to the fallback image and triggers the callback without logging to the console

Testing

• BASE_ENDPOINT=https://www.6529.io npx jest tests/components/common/FallbackImage.test.tsx --runInBand --coverage=false
• npm run lint (fails: repository already has numerous pre-existing lint warnings)
• npm run type-check (fails: repository already has many pre-existing type errors)

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https://chatgpt.com/codex/tasks/task_e_68c93fea8f008321887699a6795f3e0b

[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

See analysis details on SonarQube Cloud

[prxt6529]

Will be done in #1516