Refactored Contract Difficulty Display and Added Tooltips

[IllianiCBT]

Changed difficulty display method from green and red stars to full and half skulls to provide clearer representation of contract difficulty.

Added tooltips for contract difficulty.

Introduced a new challenge level display to the mission view panel, which will dynamically update as the contract progresses. So that players can get a better sense of the impact their combat losses make on the contract difficulty.

We do have plans to replace the skulls with something more mech-y, down the line, so this is just placeholder art derived from the Pirates faction icon.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.42%. Comparing base (a339462) to head (7731b8c).
Report is 111 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5073   +/-   ##
=========================================
  Coverage     10.42%   10.42%           
- Complexity     6028     6030    +2     
=========================================
  Files           953      953           
  Lines        134113   134143   +30     
  Branches      19435    19433    -2     
=========================================
+ Hits          13979    13983    +4     
- Misses       118785   118814   +29     
+ Partials       1349     1346    -3     

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[IllianiCBT]

Updated to replace grey skulls with black, to improve readability on dark themes.

[HammerGS]

Tested and seems to work.

I've missed most of the converstaions on this. I feel like the 2.5 bit is confusing. I think if we started at 1 skull showing parity or near parity, say +50% BV, then add the half skull for each range beyond that.

Skull Ranges
1 Skull (Parity or Near-Parity):

• OPFOR strength is 100% - 150% of the player’s BV.
• This represents a balanced or slightly challenging match where the enemy might have a slight upper hand.

1.5 Skulls (Moderately Stronger OPFOR):

• OPFOR strength is 151% - 200% of the player’s BV.
• This shows that the OPFOR has a clear advantage, making the encounter significantly more challenging.

2 Skulls (Significantly Stronger OPFOR):

• OPFOR strength is 201% - 250% of the player’s BV.
• This indicates a substantial threat level, where the enemy has a dominant position.

0.5 Skulls (Moderately Weaker OPFOR):

• OPFOR strength is 50% - 99% of the player’s BV.
• The OPFOR is somewhat weaker, but it’s still capable of providing a reasonable challenge.

0 Skulls (Significantly Weaker OPFOR):

• OPFOR strength is 0% - 49% of the player’s BV.
• This represents an encounter with a minimal threat, as the enemy is far weaker.