fix(explore): close unsaved changes modal when discarding changes

[rebenitez1802]

SUMMARY

Fixes the unsaved changes modal not closing when user clicks "Discard" during chart editing navigation.

Root cause: The handleConfirmNavigation function was missing setShowModal(false) call, causing the modal to remain open after navigation.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1. Open any chart
2. change something like time grain or metric
3. click the back button in the browser
4. click on discard button

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[korbit-ai]

Based on your review schedule, I'll hold off on reviewing this PR until it's marked as ready for review. If you'd like me to take a look now, comment /korbit-review.

Your admin can change your review schedule in the Korbit Console

[korbit-ai]

I've completed my review and didn't find any issues.

Files scanned

​

File Path	Reviewed
superset-frontend/src/hooks/useUnsavedChangesPrompt/index.ts	✅

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[rusackas]

@geido care to re-review, now that tests are in?

[geido]

Thanks for the test!

[SBIN2010]

The checks fail because of the test.
testing guidelines