[WIP] WIP to address feedback on cancellation handling

[Copilot]

Addressing feedback on request cancellation handling in refresh process.

Plan:

• Replace merge operator with forkJoin in fetchTagsHistory$ method (lines 108-109)
• Update import statement to include forkJoin instead of merge
• Verify the change maintains correct behavior and waits for all observables to complete
• Run tests to ensure the change doesn't break existing functionality
• Run linter and build to validate the change

Context:
The current implementation uses merge which emits values as soon as any source observable emits. This causes the map at line 109 to return tagsDecimatedHistory before all observables complete, resulting in incomplete data. Using forkJoin will ensure all observables complete before returning the combined result.

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