Add shortcut hints to construction tooltips

[RED-ROSE515]

Closes #3757

Summary

• Adds a shared shortcut formatter so shortcut display text can be reused outside the keyboard shortcuts window.
• Shows configured hotkeys in construction tooltips for build, remove, rotate, and select-position actions.
• Shows the configured rotate hotkey on station construction rotate tooltips.
• Displays unbound when a tooltip action has no configured shortcut.

Testing

• cmake --build build\windows-vcpkg-check --config Release --target App
• cmake --build build\windows-vcpkg-check --config Release
• ctest --test-dir build\windows-vcpkg-check -C Release -E "Assertions" --output-on-failure

[LeftofZen]

• need to rebase with master
• be consistent with terminology - either use "keyboard shortcut" or "hotkey" but not both
• add yourself to contributors.md in a new "AI-generated" section

[LeftofZen]

strings should be in double quotes

[LeeSpork]

Although I wrote it without in the issue, it might make sense to put "unbound" in parens.
Might also want to consider using "keyboard shortcut" rather than "hotkey", to be more consistent with the language used by the existing game.

Another thing I have thought about is writing a hint to add to the unbound tooltip to go to the options window to set it, although I'm not sure if that might make the tooltip too long?