rebuild cache button

[exeea]

This adds the rebuild cache button, requires MegaMek/megamek#8169

[Copilot]

Pull request overview

Adds a UI affordance to explicitly rebuild the unit cache (in addition to the existing refresh option), and aligns infantry ground MP printing with updated infantry movement semantics.

Changes:

• Update the Refresh menu to route “Refresh Unit Cache” through a dialog-backed helper and add “Rebuild Unit Cache”.
• Add miRebuildUnitCache.text to menu resources.
• Update PrintInfantry ground MP formatting to use infantry.hasMinimalGroundMP().

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
megameklab/src/megameklab/ui/MenuBar.java	Adds menu item + helper methods to refresh/rebuild the unit cache via UnitLoadingDialog and MekSummaryCache.
megameklab/src/megameklab/printing/PrintInfantry.java	Uses hasMinimalGroundMP() to decide when to print 0* for ground MP.
megameklab/resources/megameklab/resources/Menu.properties	Adds the localized label for the new rebuild cache menu item.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (507a555) to head (46e44a7).
⚠️ Report is 20 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #2170   +/-   ##
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