rusackas opened a new pull request, #34524:
URL: https://github.com/apache/superset/pull/34524
### SUMMARY
Fixes #28458 - The Country Map tooltip was not readable as it displayed
information in fixed text elements at the top of the chart instead of a proper
tooltip that follows the mouse cursor like the World Map does.
This PR implements a proper mouse-following tooltip for the Country Map
visualization with improved styling for better readability.
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
**Before:**
- Tooltip information appeared as fixed text at the top of the chart
- Poor contrast and readability
- Did not follow mouse position
**After:**
- Tooltip follows mouse cursor
- Dark background with white text for high contrast
- Smooth transitions on show/hide
- Consistent with World Map tooltip behavior
### TESTING INSTRUCTIONS
1. Create a Country Map chart with any dataset
2. Hover over different regions on the map
3. Verify that:
- A tooltip appears near the mouse cursor
- The tooltip has a dark background with white text
- The tooltip shows the region name and metric value
- The tooltip follows the mouse as you move within a region
- The tooltip disappears when you move the mouse off a region
4. Click on a region to zoom in and verify tooltips still work correctly
### ADDITIONAL INFORMATION
- [x] Has associated issue: Fixes #28458
- [ ] Required feature flags:
- [x] Changes UI
- [ ] Includes DB Migration (follow approval process in
[SIP-59](https://github.com/apache/superset/issues/13351))
- [ ] 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
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