[fix] Improved instruction selector loading state handling

[lumpinif]

Fix Instruction Selector Loading State

Changes Made

• Fixed loading state visibility during initial data fetching
• Added empty state check to prevent UI flickering
• Enhanced state transitions between loading and loaded states

Testing

• Verified loading indicator appears when data is being fetched
• Confirmed smooth transition from loading to loaded state
• Tested edge cases with empty instruction sets

Screenshots

Before: Loading state was not visible during data fetching
After: Loading state properly shows until data is fully loaded

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Changelog

Added in CHANGELOG.md under 12/3/2024