corrected difficulty ordering logic wise and on UI

[quirky-blu]

Summary of changes

Fixes incorrect difficulty ordering for issue categorization. moon_shot and earth_shot were swapped in both the issues_history initialization and the difficulty branching logic (< 2 and < 4 conditions).

The correct order from easiest to hardest is: earth_shot < moon_shot < mars_shot, as originally established in the RL-based ABM work and confirmed by maintainers.

Changes made in run_llamosc_frontend.py:

• Swapped moon_shot and earth_shot in issues_history dict initialization (lines ~334–335)
• Fixed difficulty branching so difficulty < 2 maps to earth_shot and difficulty < 4 maps to moon_shot, in both the pending tracking and solved tracking blocks

now the ui also shows the correct difficulty order [top to bottom]
old ui:

new ui:

Related issue(s)

none

Agent logic / prompts

• I have not modified any agent logic or prompts.

Tests

• This PR does not require new tests / no tests added.

Checklist

• I have read CONTRIBUTING.md and followed the contribution workflow.